SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                ----------------

                                  SCHEDULE 13D
                                 (Rule 13d-101)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
                                  RULE 13d-2(a)

                                (Amendment No. 1)


                              Century Bancorp, Inc.
--------------------------------------------------------------------------------
                                (Name of Issuer)


                      Class A Common Stock, $1.00 par value
--------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                    156432106
--------------------------------------------------------------------------------
                                 (CUSIP Number)


                                    Sy Jacobs
                            c/o JAM Managers, L.L.C.
                                 One 5th Avenue
                            New York, New York 10003

                                       and

                                  Paul Magidson
                     c/o Castine Capital Management, L.L.C.
                       One International Place, Suite 2401
                           Boston, Massachusetts 02110
                                 (617) 310-5190
--------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)


                               September 14, 2005
-------------------------------------------------------------------------------
             (Date of Event which Requires Filing of This Statement)

    If the filing person has previously filed a statement on Schedule 13G to
report the  acquisition  that is the subject of this Schedule 13D, and is filing
this  schedule  because  of Rule  13d-1(e),  13d-1(f)  or  13d-1(g),  check  the
following box [_].


CUSIP No.  156432106
           ---------------------

1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

     JAM Partners, L.P. - 13-3810784

2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                 (a)  [_]
                                                                 (b)  [_]


3.   SEC USE ONLY


4.   SOURCE OF FUNDS

     WC

5.   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   [_]



6.   CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON

7.   SOLE VOTING POWER

     210,000

8.   SHARED VOTING POWER

     0

9.   SOLE DISPOSITIVE POWER

     210,000

10.  SHARED DISPOSITIVE POWER

     0



11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     210,000

12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES


13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     6.1%

14.  TYPE OF REPORTING PERSON

     PN


CUSIP No.  156432106
           ---------------------

1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

     JAM Managers, L.L.C. - 13-4063169

2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                 (a)  [_]
                                                                 (b)  [_]


3.   SEC USE ONLY


4.   SOURCE OF FUNDS

     WC

5.   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   [_]



6.   CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON

7.   SOLE VOTING POWER

     210,000

8.   SHARED VOTING POWER

     0

9.   SOLE DISPOSITIVE POWER

     210,000

10.  SHARED DISPOSITIVE POWER

     0

11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     210,000

12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES

 

13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     6.1%

14.  TYPE OF REPORTING PERSON

     OO


CUSIP No.  156432106
           ---------------------

1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

     Sy Jacobs

2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                 (a)  [_]
                                                                 (b)  [_]


3.   SEC USE ONLY


4.   SOURCE OF FUNDS

     WC, PF

5.   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   [_]


6.   CITIZENSHIP OR PLACE OF ORGANIZATION

     United States of America

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON

7.   SOLE VOTING POWER

     230,000

8.   SHARED VOTING POWER

     0

9.   SOLE DISPOSITIVE POWER

     230,000

10.  SHARED DISPOSITIVE POWER

     0


11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     230,000

12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES

 

13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     6.7%

14.  TYPE OF REPORTING PERSON

     IN


CUSIP No.  156432106
           ---------------------

1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

     Castine Partners, LP - 38-3674333

2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                 (a)  [_]
                                                                 (b)  [_]


3.   SEC USE ONLY


4.   SOURCE OF FUNDS

     WC

5.   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   [_]


6.   CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON

7.   SOLE VOTING POWER

     53,786

8.   SHARED VOTING POWER

     0

9.   SOLE DISPOSITIVE POWER

     53,786

10.  SHARED DISPOSITIVE POWER

     0


11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     53,786

12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES


13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     1.5%

14.  TYPE OF REPORTING PERSON

     PN



CUSIP No.  156432106
           ---------------------

1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

     Castine Partners II, LP - 20-0758073

2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                 (a)  [_]
                                                                 (b)  [_]


3.   SEC USE ONLY


4.   SOURCE OF FUNDS

     WC

5.   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   [_]


6.   CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON

7.   SOLE VOTING POWER

     38,688

8.   SHARED VOTING POWER

     0

9.   SOLE DISPOSITIVE POWER

     38,688

10.  SHARED DISPOSITIVE POWER

     0


11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     38,688

12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES


13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     1.1%

14.  TYPE OF REPORTING PERSON

     PN


CUSIP No.  156432106
           ---------------------

1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

     Castine Offshore Fund, Ltd.

2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                 (a)  [_]
                                                                 (b)  [_]


3.   SEC USE ONLY


4.   SOURCE OF FUNDS

     WC

5.   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   [_]


6.   CITIZENSHIP OR PLACE OF ORGANIZATION

     Cayman Islands

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON

7.   SOLE VOTING POWER

     17,702

8.   SHARED VOTING POWER

     0

9.   SOLE DISPOSITIVE POWER

     17,702

10.  SHARED DISPOSITIVE POWER

     0


11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     17,702

12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES


13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     0.5%

14.  TYPE OF REPORTING PERSON

     CO


CUSIP No.  156432106
           ---------------------

1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

     Paul Magidson

2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                 (a)  [_]
                                                                 (b)  [_]


3.   SEC USE ONLY


4.   SOURCE OF FUNDS

     WC

5.   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   [_]


6.   CITIZENSHIP OR PLACE OF ORGANIZATION

     United States of America

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON

7.   SOLE VOTING POWER

     110,176

8.   SHARED VOTING POWER

     0

9.   SOLE DISPOSITIVE POWER

     110,176

10.  SHARED DISPOSITIVE POWER

     0


11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     110,176

12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES


13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     3.2%

14.  TYPE OF REPORTING PERSON

     IN


CUSIP No.  156432106
            ---------------------

-------------------------------------------------------------------------------
Item 1.  Security and Issuer.

The class of equity  securities  to which this  Statement  on Schedule 13D (this
"Schedule  13D") relates is the Class A Common Stock,  $1.00 par value per share
(the "Class A Common Stock"),  of Century  Bancorp,  Inc.  ("Century  Bancorp").
Century  Bancorp is a  Massachusetts  corporation  with its principal  executive
offices located at 400 Mystic Avenue, Medford, MA 02155.

-------------------------------------------------------------------------------
Item 2.  Identity and Background.

     (a) This  Schedule  13D is being filed by JAM  Partners,  L.P.,  a Delaware
limited  partnership  ("JAM  Partners"),  (ii) JAM Managers  L.L.C.,  a Delaware
limited liability  company ("JAM  Managers"),  (iii) Sy Jacobs, a citizen of the
United  States of America  ("Jacobs"),  (iv)  Castine  Partners,  LP, a Delaware
limited  partnership  ("Castine  Partners"),  (v)  Castine  Partners  II,  LP, a
Delaware  limited  partnership  ("Castine  Partners II"), (vi) Castine  Offshore
Fund, Ltd., a Cayman Islands corporation  ("Castine  Offshore"),  and (vii) Paul
Magidson, a citizen of the United States of America  ("Magidson").  These filers
are  referred  to  individually  as a  "Reporting  Person" and  collectively  as
"Reporting Persons".

     (b) The business office of JAM Partners, JAM Managers L.L.C., and Jacobs is
One Fifth  Avenue,  New York,  New York 10003.  The  business  office of Castine
Partners,  Castine  Partners  II,  Castine  Offshore and Magidson is c/o Castine
Capital   Management,   LLC,  One  International   Place,  Suite  2401,  Boston,
Massachusetts 02110.

     (c) JAM Partners is an investment fund, JAM Managers is the general partner
of JAM  Partners,  and  Jacobs' is a managing  member of JAM  Managers.  Castine
Partners,  Castine Partners II, and Castine  Offshore are investment  funds, and
Magidson is a managing  member of the general  partner or investment  manager of
these investment funds.

     (d)  None  of the  Reporting  Persons  has  been  convicted  in a  criminal
proceeding  (excluding  traffic violations or similar  misdemeanors)  during the
last five years.

     (e) None of the Reporting Persons has been a party to a civil proceeding of
a judicial or administrative body of competent jurisdiction during the last five
years, and no Reporting  Person is subject to a judgment,  decree or final order
enjoining future violations of, or prohibiting or mandating  activities  subject
to,  Federal or State  securities  laws or finding any violation with respect to
such laws.

-------------------------------------------------------------------------------
Item 3.  Source and Amount of Funds or Other Consideration.

With respect to all  Reporting  Persons  other than Jacobs,  the source of funds
used in making the purchases was working  capital.  With respect to Jacobs,  the
source of funds used in making the  purchases  was working  capital and personal
funds.

-------------------------------------------------------------------------------
Item 4.  Purpose of Transaction.

With respect to all Reporting  Persons,  the purpose of the  transaction  was to
invest in Century  Bancorp's Class A Common Stock. None of the Reporting Persons
has any  plans  or  proposals  that  relate  to or  would  result  in any of the
following:

     (a) The  acquisition by any person of additional  securities of the issuer,
or the disposition of securities of the issuer;

     (b)  An   extraordinary   corporate   transaction,   such   as  a   merger,
reorganization or liquidation, involving the issuer or any of its subsidiaries;

     (c) A sale or transfer of a material  amount of assets of the issuer or any
of its subsidiaries;

     (d) Any change in the  present  board of  directors  or  management  of the
issuer,  including  any  plans or  proposals  to  change  the  number or term of
directors or to fill any existing vacancies on the board;

     (e) Any material change in the present capitalization or dividend policy of
the issuer;

     (f) Any  other  material  change  in the  issuer's  business  or  corporate
structure;

     (g) Changes in the issuer's  charter,  bylaws or instruments  corresponding
thereto or other  actions  which may impede  the  acquisition  of control of the
issuer by any person;

     (h)  Causing a class of  securities  of the  issuer to be  delisted  from a
national  securities  exchange or to cease to be  authorized  to be quoted in an
inter-dealer quotation system of a registered national securities association;

     (i) A class of  equity  securities  of the  issuer  becoming  eligible  for
termination of registration pursuant to Section 12(g)(4) of the Act; or

     (j) Any action similar to any of those enumerated above.

However,  the Reporting Persons have certain concerns  regarding the management,
operations,  and corporate  governance of Century Bancorp,  and on September 14,
2005 JAM Partners  sent a letter to the Board of  Directors  of Century  Bancorp
expressing  these  concerns.  A copy of this letter is attached to this Schedule
13D as Exhibit 1.

-------------------------------------------------------------------------------
Item 5.  Interest in Securities of the Issuer.

The  Reporting  Persons  believe  that the  filing of this  Schedule  13D is not
required  pursuant to the  Securities  Exchange Act of 1934, as amended,  or the
regulations and rules promulgated thereunder. However, the Reporting Persons are
filing  this  Schedule  13D on a  voluntary  basis.  Neither  the filing of this
Schedule 13D nor any of its contents  shall be deemed to constitute an admission
that any person filing this Schedule 13D is the beneficial  owner of any Class A
Common Stock  referred to herein for purposes of Section 13(d) of the Securities
Exchange Act of 1934, as amended, or for any other purpose,  and such beneficial
ownership is expressly disclaimed.

     (a) As of July 31,  2005,  3,435,677  shares of Century  Bancorp's  Class A
Common  Stock were  outstanding  (as  disclosed in Century  Bancorp's  Quarterly
Report on Form 10-Q for the fiscal  quarter ended June 30, 2005).  The aggregate
number and percentage of Class A Common Stock held by each  Reporting  Person is
disclosed  in  Items 11 and 13 of such  Reporting  Person's  cover  page to this
Schedule 13D.

     (b) The number of shares of Class A Common Stock as to which each Reporting
Person has (i) sole or shared  power to vote or to direct the vote and (ii) sole
or shared power to dispose or to direct the disposition is disclosed in Items 7,
8, 9, and 10 of such Reporting Person's cover page to this Schedule 13D.

     (c) There have been no  transactions  in the shares of Class A Common Stock
effected during the past 60 days by any of the Reporting Persons.

-------------------------------------------------------------------------------
Item 6.  Contracts, Arrangements, Understandings or Relationships with Respect
         to Securities of the Issuer.

The Reporting  Persons have agreed to share the legal expenses  associated  with
preparing this Schedule 13D and to jointly file this Schedule 13D.

-------------------------------------------------------------------------------
Item 7.  Material to be Filed as Exhibits.

Exhibit No.         Description

1                   Letter from JAM Partners, L.P. to the Board of 
                    Directors of Century Bancorp, Inc. dated September 14, 2005.

2                   Joint Filing Agreement among the Reporting Persons dated 
                    as of September 14, 2005.

-------------------------------------------------------------------------------


                                   SIGNATURE



     After  reasonable  inquiry  and to the  best of  each of the  undersigned's
knowledge and belief, each of the undersigned certifies that the information set
forth in this statement is true, complete and correct.

Dated: September 14, 2005

                                           SY JACOBS


                                           /s/ Sy Jacobs

                                           -------------------------------
                                               Sy Jacobs


                                           JAM PARTNERS, L.P.


                                           By:  JAM Managers L.L.C.
                                                General Manager

                                             By:    /s/ Sy Jacobs

                                            -------------------------------
                                            Name:   Sy Jacobs
                                            Title:  Managing Member



                                           JAM MANAGERS L.L.C.

                                           By:  /s/ Sy Jacobs

                                                ---------------------------
                                                Name:   Sy Jacobs
                                                Title:  Managing Member


                                           CASTINE PARTNERS, LP

                                           By:  /s/ Paul Magidson

                                                ---------------------------
                                                Name:  Paul Magidson
                                                Title:  General Partner


                                           CASTINE PARTNERS II, LP

                                           By:  /s/ Paul Magidson

                                                 --------------------------
                                                 Name:  Paul Magidson
                                                 Title:  General Partner


                                           CASTINE OFFSHORE FUND, LTD.

                                           By:  /s/ Paul Magidson

                                                 -----------------------------
                                                 Name:  Paul Magidson
                                                 Title:  General Partner


                                           PAUL MAGIDSON

                                           By:  /s/ Paul Magidson

                                                 -----------------------------
                                                 Name:  Paul Magidson


                                                                   Exhibit 1
                                                                   ---------


Via mail, email (msloane@century-bank.com), and facsimile (781-393-4070)

September 14, 2005

The Board of Directors
c/o Marshall M. Sloane
Chairman of the Board
Century Bancorp, Inc.
400 Mystic Avenue
Medford, MA  02155

Dear Members of the Board of Directors;

I am writing to express our group's  disappointment  over several  things:  your
decision to decline to meet with us, the continued poor performance of the bank,
the continuing large gap between Century  Bancorp's  current stock price and its
value as a partner with a larger institution, and ongoing lack of fair corporate
governance. We hope that this refusal is not indicative of mere close-mindedness
but rather that the Board takes its fiduciary responsibility seriously enough to
be exploring other options privately even as we write this letter.

Since we wrote to the Board of Directors on June 7, Century Bancorp has reported
yet another  disappointing  quarter.  In fact, the second quarter marked an even
worse showing than that of the first. Based on the supportive rhetoric put forth
in management and Board statements, we imagine that the second quarter financial
results must have come as a surprise  even to them.  It seems  unlikely that one
would speak so  convincingly  of a glowing  future if this was the expected near
term  performance.  Return on equity  slipped  further from the first quarter to
7.8% and the efficiency  ratio worsened as well to 75.5%.  In addition,  the net
interest margin  continued to weaken as a result of  management's  balance sheet
positioning.  Century  remains  one of the  worst  performing  banks in its peer
group.  There are  precious  few  percentiles  between you and the bottom of the
profitability rankings. Note again that the first quarter, which was better than
the most recent  quarter,  was supposed to demonstrate  the beginning of Century
Bank's capacity to "excel" and to "thrive," in the words of management.  One can
only wonder if such poor performance is how management defines such terms.

There are many examples of what we consider to be financial ineptitude.  We have
to ask why, for instance,  Century offers (as of 9/5/05) a special rate of 3.59%
on a 10-month CD when the  available-for-sale  securities  portfolio yields only
3.39%?  While this  appears to us to produce a loss even  before  allocation  of
non-interest  expense,  perhaps Century management  believes that it can make up
for such losses with volume. We also puzzle over the apparent  dichotomy between
Director Karl Case's recent  comments to the Wall Street  Journal and the Boston
Globe regarding a softening  Massachusetts real estate market (based on canceled
listings)  and the growth in Century  Bank's home equity loans and  construction
and land development  loans.  Despite Mr. Case's comments on declining demand in
the housing market,  Century grew its home equity loans by 10% and  construction
and  land  development  loans  by 16% in  the  second  quarter.  Note  that  the
annualized growth rates of these portfolios are 46% and 81%, respectively. Given
Mr.  Case's  sentiment,  we do not  understand  the rationale for such growth in
these seemingly higher-risk loan categories.

Other  institutional  investors  have  weighed  in on the  issues  raised in our
initial  13D  filing,  with two  (including  an 11%  holder of A shares)  having
written  letters to the board in support of our case. We have also received oral
encouragement from other large Class A shareholders. It is clear that we are not
the only  shareholders  that recognize  Century's dual class share structure for
the  unfair  management  entrenchment  that it is.  In  addition  to the lack of
accountability  that such a structure fosters,  the Sloanes add insult to injury
with the nepotism policy that plagues the financial returns at Century.  Look no
further than the Wall Street Journal  article of August 1, 2005 entitled "All In
The Family," which points out the poor track record of companies with nepotistic
succession.  The  subtitle is "Why  should  executive  posts at publicly  traded
companies be passed on like  heirlooms?" We are confident  that any  shareholder
referendum  that we put before the Class A  shareholders  (were we allowed to do
so) would result in an overwhelming repudiation of management's current policies
of  nepotism  and  ineffective  financial  management  and would  wholeheartedly
endorse the hiring of an  independent  investment  bank to explore the strategic
options of the company.

On July 12th, Century management announced that the Board had approved a 300,000
share stock repurchase program. Why was the Class A stock attractive at $35 (the
July 11th close) and not at $27 five weeks earlier? A similar  authorization was
approved one year earlier and not a single share was  repurchased.  It certainly
appears that  management is big on talk but not on action.  In fact,  the upward
moves in Century stock have come when we have spoken (our initial  letter and my
interview in Barron's) and the downward  moves when  management has repeated its
usual   rhetoric   about  long  term  value   creation  and  the  commitment  to
independence.  We would suggest that simply  repeating that  independence is the
best course of action is not in itself a course of action.

We  believe  that  there  would be a line of buyers  were  Century  to explore a
possible  sale  of the  bank.  Subsequent  to  our  last  letter,  we  have  had
conversations  with  management  teams at other banks to gauge whether or not we
are accurate in our assessment that Century is a desirable acquisition candidate
despite  (or,  perhaps,  because of)  management's  inability  to put the bank's
attractive  deposits  to  work in a way  that  falls  to the  bottom  line.  Our
conclusion  is that  there  exist  other  banks  that  would be willing to pay a
significant premium to the current stock price for Century Bank. Compare this to
the  outlook of Gerard  Cassidy  of RBC  Capital  Markets,  who stated in a June
research report that Century is worth $20 per share based on its fundamentals as
an independent entity. Note that Mr. Cassidy is an independent  research analyst
and not in any way affiliated with our group.  His opinion is unbiased.  How can
the Board refuse to address this  seeming  dichotomy?  We would like to ask who,
other than the Board,  would  favor a $20 share  price over the $46-57 per share
range we cite in our June letter as our  estimate of  Century's  value to a bank
purchaser?

How does the independent  board reconcile its refusal to meet with us to discuss
our questions about continued  independence  and poor results with the statement
in your June 10th press  release that "Century Bank is committed to listening to
any shareholder  concerns regarding the ongoing operations and management of the
Bank?"  We would  hope  that  the  Board  would  wish to learn  more  about  our
conversations with potential partners that are eager to express such interest to
the Board. In closing,  we again call on the  independent  Board members to meet
with us to discuss the above issues.

We will soon file a 13D statement  with the SEC with this letter  attached as an
exhibit. We look forward to your response in regard to accommodating our request
for a meeting with the independent directors.

Sincerely,



Sy Jacobs
Managing Member
Jacobs Asset Management, L.L.C.
JAM Managers, L.L.C.
As General Partner for JAM Partners, L.P.


                                                                 Exhibit 2

                             Joint Filing Agreement

Pursuant to Rule  13d-1(k)(1)  under the  Securities  Exchange  Act of 1934,  as
amended,  each  of  the  undersigned  hereby  agrees  that  only  one  statement
containing the  information  required by Schedule 13D need be filed with respect
to the ownership by each of the  undersigned  of shares of Class A Common Stock,
$1.00 par value per share, of Century Bancorp, Inc.

This  Agreement  may be  executed in any number of  counterparts,  each of which
shall be deemed an original.

Executed this 14th day of September, 2005.

JAM PARTNERS, L.P.

By:  JAM Managers L.L.C., its general partner

By:  /s/ Sy Jacobs
    -------------------------------
Name:  Sy Jacobs
Title:  Managing Member

JAM MANAGERS L.L.C.

By:  /s/ Sy Jacobs
    --------------------------------------
Name:  Sy Jacobs
Title:  Managing Member

SY JACOBS

By:  /s/ Sy Jacobs
    --------------------------------------
Name:  Sy Jacobs

CASTINE PARTNERS, LP

By:  /s/ Paul Magidson
    --------------------------------------
Name:  Paul Magidson
Title:  General Partner

CASTINE PARTNERS II, LP

By:  /s/ Paul Magidson
    --------------------------------------
Name:  Paul Magidson
Title:  General Partner


CASTINE OFFSHORE FUND, LTD.

By:  /s/ Paul Magidson
    ---------------------------------------
Name:  Paul Magidson
Title:  General Partner


PAUL MAGIDSON

By:  /s/ Paul Magidson
    ---------------------------------------
Name:  Paul Magidson





01252.0001 #601011