EXHIBIT 4.2

                                                                      Plan #001

                                  STANDARDIZED
                               ADOPTION AGREEMENT
                   PROTOTYPE CASH OR DEFERRED PROFIT-SHARING
                        PLAN AND TRUST/CUSTODIAL ACCOUNT

                                  SPONSORED BY

                       THE FIRST NATIONAL BANK OF BOSTON

The Employer named below hereby establishes a Cash or Deferred Profit-Sharing
Plan for eligible Employees as provided in this Adoption Agreement and the
accompanying Basic Prototype Plan and Trust/Custodial Account Basic Plan
Document #04.

1.    EMPLOYER INFORMATION

      NOTE:     If multiple Employers are adopting the Plan, complete this
                section based on the lead Employer. Additional Employers may
                adopt this Plan by attaching executed signature pages to the
                back of the Employer's Adoption Agreement.

      (a)  NAME AND ADDRESS:

           CENTURY BANCORP, INC.
           400 MYSTIC AVENUE
           MEDFORD, MA  02155

      (b)  TELEPHONE NUMBER:   (617)391-4000

      (c)  TAX ID NUMBER:      04-2498617

      (d)  FORM OF BUSINESS:

           [ ]  (i)   Sole Proprietor

           [ ]  (ii)  Partnership

           [X]  (iii) Corporation

           [ ]  (iv)  "S" Corporation (formerly known as Subchapter S)

           [ ]  (v)   Other:




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      (e)  NAME OF INDIVIDUAL AUTHORIZED TO ISSUE
           INSTRUCTIONS TO THE TRUSTEE/CUSTODIAN:

           PAUL V. CUSICK

      (f)  NAME OF PLAN:  CENTURY BANCORP 401(K) PLAN


      (g)  THREE DIGIT PLAN NUMBER
           FOR ANNUAL RETURN/REPORT:         002

2.    EFFECTIVE DATE

      (a)  This is a new Plan having an effective date of OCTOBER 1, 1996.

      (b)  This is an amended Plan.

           The effective date of the original Plan was _______________.

           The effective date of the amended Plan is _______________.

      (c)  If different from above, the Effective Date for the Plan's Elective
           Deferral provisions shall be _______________.

3.    DEFINITIONS

      (a)  "Collective or Commingled Funds" (Applicable to Institutional
           Trustees only.) Investment in collective or commingled funds as
           permitted at paragraph 13.3(b) of the Basic Plan Document #04 shall
           only be made to the following specifically named fund(s):





           Funds made available after the execution of this Adoption Agreement
           will be listed on schedules attached to the end of this Adoption
           Agreement.

      (b)  "Compensation" Compensation shall be determined on the basis of 
           the:




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           [X]  (i)   Plan Year.

           [ ]  (ii)  Employer's Taxable Year.

           [ ]  (iii) Calendar Year.

           Compensation shall be determined on the basis of the following 
           safe-harbor definition of Compensation in IRS Regulation Section
           1.414(s)-1(c):

           [ ]  (iv)  Code Section 6041 and 6051 Compensation,

           [X]   (v)  Code Section 3401(a) Compensation, or

           [ ]  (vi)  Code Section 415 Compensation.

           Compensation [X] shall [ ] shall not include Employer contributions
           made pursuant to a Salary Savings Agreement which are not includable
           in the gross income of the Employee for the reasons indicated in the
           definition of Compensation at 1.12 of the Basic Plan Document #04.

           For purposes of the Plan, Compensation shall be limited to $______ , 
           the maximum amount which will be considered for Plan purposes. [If 
           an amount is specified, it will limit the amount of contributions
           allowed on behalf of higher compensated Employees. Completion of
           this section is not intended to coordinate with the $200,000 of Code
           Section 415(d), thus the amount should be less than $200,000 as
           adjusted for cost-of-living increases.]

      (c)  "Entry Date"

           [ ]   (i)  The first day of the Plan Year nearest the date on
                      which an Employee meets the eligibility requirements.

           [X]   (ii) The earlier of the first day of the Plan Year or the
                      first day of the seventh month of the Plan Year 
                      coinciding with or following the date on which an 
                      Employee meets the eligibility requirements.

           [ ]  (iii) The first day of the Plan Year following the date on 
                      which the Employee meets the eligibility requirements. If



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                      this election is made, the Service requirement at 
                      4(a)(ii) may not exceed 1/2 year and the age requirement
                      at 4(b)(ii) may not exceed 20-1/2.

           [ ]  (iv)  The first day of the month coinciding with or following 
                      the date on which an Employee meets the eligibility
                      requirements.

           [ ]   (v)  The first day of the Plan Year, or the first day of
                      the fourth month, or the first day of the seventh month 
                      or the first day of the tenth month, ofthe Plan Year
                      coinciding with or following the date on which an 
                      Employee meets the eligibility requirements.

      (d)  "Hours of Service" Shall be determined on the basis of the method
           selected below. Only one method may be selected. The method selected
           shall be applied to all Employees covered under the Plan as follows:

           [ ]   (i)  On the basis of actual hours for which an Employee is
                      paid or entitled to payment.

           [ ]  (ii)  On the basis of days worked. An Employee shall be
                      credited with ten (10) Hours of Service if under 
                      paragraph 1.42 of the Basic Plan Document #04 such 
                      Employee would be credited with at least one (1) Hour of 
                      Service during the day.

           [ ] (iii)  On the basis of weeks worked. An Employee shall be
                      credited with forty-five (45) Hours of Service if under
                      paragraph 1.42 of the Basic Plan Document #04 such
                      Employee would be credited with at least one (1) Hour of
                      Service during the week.

           [ ]  (iv)  On the basis of semi-monthly payroll periods.
                      An Employee shall be credited with ninety-five (95) Hours
                      of Service if under paragraph 1.42 of the Basic Plan
                      Document #04 such Employee would be credited with at 
                      least one (1) Hour of Service during the semi-monthly 
                      payroll period.

           [X]   (v)  On the basis of months worked. 



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                      An Employee shall be credited with one-hundred-ninety 
                      (190) Hours of Service if under paragraph 1.42 of the 
                      Basic Plan Document #04 such Employee would be credited 
                      with at least one (1) Hour of Service during the month.

      (e)  "Limitation Year" The 12-consecutive month period commencing on
           JANUARY 1 and ending on DECEMBER 31.

           If applicable, the Limitation Year will be a short Limitation Year
           commencing on OCTOBER 1, 1996 and ending on DECEMBER 31, 1996 .
           Thereafter, the Limitation Year shall end on the date last specified
           above.

      (f)  "Net Profit"

           [X]   (i)  Not applicable (profits will not be required for any 
                      contributions to the Plan).

           [ ]  (ii)  As defined in paragraph 1.49 of the Basic Plan
                      Document #04.

           [ ] (iii)  Shall be defined as:

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

                      (Only use if definition in paragraph 1.49 of the Basic
                      Plan Document #04 is to be superseded.)

      (g)  "Plan Year" The 12-consecutive month period commencing on JANUARY 1
           and ending on DECEMBER 31.

           If applicable, the Plan Year will be a short Plan Year commencing on
           OCTOBER 1, 1996 and ending on DECEMBER 31, 1996. Thereafter, the
           Plan Year shall end on the date last specified above.

      (h)  "Qualified Early Retirement Age" For purposes of making 
           distributions under the provisions of a Qualified Domestic Relations
           Order, the Plan's Qualified Early Retirement Age with regard to the
           Participant against whom the order is entered [X] shall  [ ] shall 


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           not be the date the order is determined to be qualified.  If "shall" 
           is elected, this will only allow payout to the alternate payee(s).

      (i)  "Qualified Joint and Survivor Annuity" The safe-harbor provisions of
           paragraph 8.7 of the Basic Plan Document #04  [X] are  [  ] are not
           applicable.  If not applicable, the survivor annuity shall be ____%
           (50%, 66-2/3%, 75% or 100%) of the annuity payable during the lives 
           of the Participant  and Spouse.   If no answer is specified, 50% 
           will be used.

      (j)  "Taxable Wage Base" [paragraph 1.79]

           [X]   (i)  Not Applicable - Plan is not integrated with Social 
                      Security.

           [ ]  (ii)  The maximum earnings considered wages for such Plan Year 
                      under  Code  Section 3121(a).

           [ ] (iii)  % (not more than 100%) of the amount considered wages for
                      such Plan Year under Code Section 3121(a).

           [ ]  (iv)  $_________, provided that such amount is not in excess of
                      the amount determined under paragraph 3(j)(ii) above.

           [ ]  (v)   For the 1989 Plan Year $10,000.  For all subsequent Plan 
                      Years, 20% of the maximum earnings considered wages for
                      such Plan Year under Code Section 3121(a).
      NOTE:     Using less than the maximum at (ii) may result in a change in 
                the allocation formula in Section 7.

      (k)  "Valuation Date(s)" Allocations to Participant Accounts will be done
           in accordance with Article V of the Basic Plan Document #04:

           (i)   Daily          (v)   Quarterly

           (ii)  Weekly         (vi)  Semi-Annually

           (iii) Monthly        (vii) Annually

           (iv)  Bi-Monthly




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           Indicate Valuation Date(s) to be used by specifying option from list
           above:

           Type of Contribution(s)                          Valuation Date(s)

           After-Tax Voluntary Contributions [Section 6]    ------

           Elective Deferrals [Section 7(b)]                i
                                                            ------
           Matching Contributions [Section 7(c)]            ------

           Qualified Non-Elective Contributions
           [Section 7(d)]                                   i
                                                            ------
           Non-Elective Contributions [Section 7(e), (f)
           and (g)]                                         ------

           Minimum Top-Heavy Contributions
           [Section 7(i)]                                   i
                                                            ------
      (l)  "Year of Service"

           (i)   For Eligibility Purposes:  The 12-consecutive month period 
                 during which an Employee is credited with 1000 (not more than 
                 1,000) Hours of Service.

           (ii)  For Allocation Accrual Purposes: The 12-consecutive month
                 period during which an Employee is credited with 501 (not more
                 than 1,000) Hours of Service. (For Plan Years beginning in 
                 1990 and thereafter, if a number greater than 501 is 
                 specified, it will be deemed to be 501.)

           (iii) For Vesting Purposes:  The 12-consecutive month period during 
                 which an Employee is credited with 1000 (not more than 1,000)
                 Hours of Service.

4.    ELIGIBILITY REQUIREMENTS

      (a)  Service:

           [ ]   (i)  The Plan shall have no  service requirement.




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           [X]  (ii)  The Plan shall cover only Employees having completed at 
                      least 1 [not more than three (3)] Years of Service. If
                      more than one (1) is specified, for Plan Years beginning
                      in 1989 and later, the answer will be deemed to be one
                      (1).

      NOTE:           If the eligibility period selected is less than one year,
                      an Employee will not be required to complete any 
                      specified number of Hours of Service to receive credit 
                      for such period.

      (b)  Age:

           [ ]   (i)  The Plan shall have no minimum age requirement.

           [X]  (ii)  The Plan shall cover only Employees having attained age 
                      21 (not more than age 21).

      (c)  Classification:

           The Plan shall cover all Employees who have met the age and service
           requirements with the following exceptions:

           [X]   (i)  No exceptions.

           [ ]  (ii)  The Plan shall exclude Employees included in a unit of 
                      Employees covered by a collective bargaining agreement
                      between the Employer and Employee Representatives, if 
                      retirement benefits were the subject of good faith
                      bargaining.  For this purpose, the term "Employee 
                      Representative" does not include any organization more 
                      than half of whosemembers are Employees who are owners, 
                      officers, or executives of the Employer.

           [ ] (iii)  The Plan shall exclude Employees who are nonresident 
                      aliens and who receive no earned income from the Employer
                      which constitutes income from sources within the United 
                      States.





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      (d)  Employees on Effective Date:

           [X]   (i)   Not Applicable.  All Employees will be required to 
                       satisfy both the age and Service requirements specified 
                       above.

           [ ]  (ii)   Employees employed on the Plan's Effective Date do
                       not have to satisfy the Service requirements specified
                       above.

           [ ] (iii)   Employees employed on the Plan's Effective Date do not 
                       have to satisfy the age requirements specified above.

5.    RETIREMENT AGES

      (a)  Normal Retirement Age:

           If the Employer imposes a requirement that Employees retire upon
           reaching a specified age, the Normal Retirement Age selected below
           may not exceed the Employer imposed mandatory retirement age.

           [X]   (i)   Normal Retirement Age shall be 65 (not to exceed age 
                       65).

           [ ]  (ii)   Normal Retirement Age shall be the later of attaining 
                       age (not to exceed age 65) or the (not to exceed the 
                       5th) anniversary of the first day of the first Plan
                       Year in which the Participant commenced participation in
                       the Plan.

      (b)  Early Retirement Age:

           [X]   (i)   Not Applicable.

           [ ]  (ii)   The Plan shall have an Early Retirement Age of (not less
                       than 55) and completion of Years of Service.





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6.    EMPLOYEE CONTRIBUTIONS

      [X] (a) Participants shall be permitted to make Elective Deferrals in any
              amount from 2 % up to 15 % of their Compensation.

              If (a) is applicable, Participants shall be permitted to amend 
              their Salary Savings Agreements to change the contribution 
              percentage as provided below:

              [ ]   (i)  On the Anniversary Date of the Plan,

              [ ]  (ii)  On the Anniversary  Date of the Plan and on the 
                         first day of the  seventh month of the Plan Year,

              [ ] (iii)  On the Anniversary Date of the Plan and on the first
                         day following any Valuation Date, or

              [X]  (iv)  Upon 30 days notice to the Employer.

      [ ] (b) Participants shall be permitted to make after tax Voluntary 
              Contributions.

      [ ] (c) Participants shall be required to make after tax Voluntary 
              Contributions as follows (Thrift Savings Plan):

              [ ]  (i)  ____% of Compensation.

              [ ] (ii)  A percentage determined by the Employee on his or her 
                        enrollment form.

      [X] (d) If necessary to pass the Average Deferral Percentage Test,
              Participants [ ] may [X] may not have Elective Deferrals
              recharacterized as Voluntary Contributions.

      NOTE:         The Average Deferral Percentage Test will apply to 
                    contributions under (a) above.  The Average Contribution
                    Percentage Test will apply to contributions under (b) and 
                    (c) above, and may apply to (a).





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7.    EMPLOYER CONTRIBUTIONS AND ALLOCATION THEREOF

      NOTE:     The Employer shall make contributions to the Plan in accordance
                with the formula or formulas selected below.  The Employer's
                contribution shall be subject to the limitations contained in 
                Articles III and X.  For this purpose, a contribution for a 
                Plan Year shall be limited for the Limitation Year which ends 
                with or within such Plan Year.  Also, the integrated allocation
                formulas beloware for Plan Years beginning in 1989 and later.  
                The Employer's allocation for earlier years shall be as 
                specified in its Plan prior to amendment for the Tax Reform Act
                of 1986.

      (a)  Profits Requirement:

           (i)  Current or Accumulated Net Profits are required for:

                [ ] (A)  Matching Contributions.

                [ ] (B)  Qualified Non-Elective Contributions.

                [ ] (C)  discretionary contributions.

           (ii) No Net Profits are required for:

                [ ] (A)  Matching Contributions.

                [X] (B)  Qualified Non-Elective Contributions.

                [ ] (C)  discretionary contributions.

      NOTE:         Elective Deferrals can always be contributed regardless of 
                    profits.

      [X]  (b)  Salary Savings Agreement:

                The Employer shall contribute and allocate to each
                Participant's account an amount equal to the amount withheld
                from the Compensation of such Participant pursuant to his or
                her Salary Savings Agreement. If applicable, the maximum
                percentage is specified in Section 6 above.




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                An Employee who has terminated his or her election under the
                Salary Savings Agreement other than for hardship reasons may
                not make another Elective Deferral:

                [ ]   (i)  until the first day of the next Plan Year.

                [ ]  (ii)  until the first day of the next valuation period.

                [X] (iii)  for a period of 1 month(s) (not to exceed 12 
                           months).

      [ ]  (c)  Matching Employer Contribution [See paragraphs (h) and (i)]:

      [ ]  (i)  PERCENTAGE MATCH:  The Employer shall contribute and allocate 
                to each eligible Participant's  account an amount equal to
                _____% of the amount contributed and allocated in accordance
                with paragraph 7(b) above and (if checked) % of [ ] the amount
                of Voluntary Contributions made in accordance with paragraph
                4.1 of the Basic Plan Document #04. The Employer shall not
                match Participant Elective Deferrals as provided above in
                excess of $ or in excess of % of the Participant's Compensation
                or if applicable, Voluntary Contributions in excess of $ or in
                excess of % of the Participant's Compensation. In no event will
                the match on both Elective Deferrals and Voluntary
                Contributions exceed a combined amount of $ or %.

      [ ]  (ii) DISCRETIONARY MATCH:  The Employer shall contribute and 
                allocate to each eligible Participant's account a percentage of
                the Participant's Elective Deferral contributed and allocated 
                in accordance with paragraph 7(b) above.  The Employer shall 
                set such percentage prior to the end of the Plan Year.  The 
                Employer shall not match Participant Elective Deferrals in 
                excess of $________ or in excess of ____% of the Participant's 
                Compensation.

      [ ] (iii) TIERED MATCH: The Employer shall contribute and allocate to 
                each Participant's account an amount equal to % of the first
                ____% of the Participant's Compensation, to the extent 
                deferred.




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                ____% of the next ____% of the Participant's Compensation, to 
                the extent deferred.

                ____% of the next ____% of the Participant's Compensation, to 
                the  extent deferred.

      NOTE:     Percentages specified in (iii) above may not increase as the 
                percentage of Participant's contribution increases.

      [ ]  (iv) FLAT DOLLAR MATCH: The Employer shall contribute and allocate 
                to each Participant's account $ if the Participant defers at 
                least 1% of Compensation.

      [ ]   (v) PERCENTAGE OF COMPENSATION MATCH:  The Employer shall 
                contribute and allocate to each Participant's account ____% of
                Compensation if the Participant defers at least 1% of 
                Compensation.

      [ ]  (vi) PROPORTIONATE COMPENSATION MATCH: The Employer shall contribute
                and allocate to each Participant who defers at least 1% of
                Compensation, an amount determined by multiplying such Employer
                Matching Contribution by a fraction the numerator of which is 
                the Participant's Compensation and the denominator of which is
                the Compensation of all Participants eligible to receive such
                an allocation.  The Employer shall set such discretionary 
                contribution prior to the end of the Plan Year.

      [ ] (vii) QUALIFIED MATCH:  Employer Matching Contributions will be 
                treated as Qualified Matching Contributions to the extent
                specified below:

                [ ] (A)  All Matching Contributions.

                [ ] (B)  None.

                [ ] (C)  ____% of the Employer's Matching Contribution.

                [ ] (D)  up to ____% of each Participant's Compensation.




                [ ]  (E)  The amount necessary to meet the [ ] Average
                          Deferral Percentage (ADP) test, [ ] Average
                          Contribution Percentage (ACP) test, [ ] Both 
                          the ADP and ACP tests.

         (viii) MATCHING CONTRIBUTION COMPUTATION PERIOD:  The time period upon
                which matching contributions will be based shall be

                [ ]  (A)  weekly

                [ ]  (B)  bi-weekly

                [ ]  (C)  semi-monthly

                [ ]  (D)  monthly

                [ ]  (E)  quarterly

                [ ]  (F)  semi-annually

                [ ]  (G)  annually

           (ix) ELIGIBILITY FOR MATCH: Employer Matching Contributions, whether
                or not Qualified, will only be made on Employee Contributions
                not withdrawn prior to the end of the [ ] valuation period 
                [ ]Plan Year.

  [X]  (d) Qualified Non-Elective Employer Contribution [See paragraphs (h)
           and (i)] These contributions are fully vested when contributed.

           The Employer shall have the right to make an additional
           discretionary contribution which shall be allocated to each eligible
           Employee in proportion to his or her Compensation as a percentage of
           the Compensation of all eligible Employees. This part of the
           Employer's contribution and the allocation thereof shall be
           unrelated to any Employee contributions made hereunder. The amount
           of Qualified non-Elective Contributions taken into account for
           purposes of meeting the ADP or ACP test requirements is:

           [ ]   (i)  All such Qualified non-Elective Contributions.




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           [X]  (ii) The amount necessary to meet [X] the ADP test, 
                     [ ] the ACP test, [ ] Both the ADP and ACP tests.

           Qualified non-Elective Contributions will be made to:

           [ ] (iii) All Employees eligible to participate.

           [X]  (iv) Only  non-Highly   Compensated  Employees
                     eligible to participate.

[ ]   (e)  Additional Employer Contribution Other Than Qualified Non-Elective
           Contributions-Non-Integrated [See paragraphs (h) and (i)]

           The Employer shall have the right to make an additional 
           discretionary contribution which shall be allocated to each eligible
           Employee in proportion to his or her Compensation as a percentage of
           the Compensation of all eligible Employees. This part of the
           Employer's contribution and the allocation thereof shall be
           unrelated to any Employee contributions made hereunder.

[ ]   (f)  Additional Employer Contribution - Integrated Allocation Formula 
           [See paragraphs (h) and (i)]

           The Employer shall have the right to make an additional
           discretionary contribution. The Employer's contribution for the Plan
           Year plus any forfeitures shall be allocated to the accounts of
           eligible Participants as follows:

           (i)  First, to the extent contributions and forfeitures are
                sufficient, all Participants will receive an allocation equal
                to 3% of their Compensation.

           (ii) Next, any remaining Employer Contributions and forfeitures will
                be allocated to Participants who have Compensation in excess of
                the Taxable Wage Base (excess Compensation). Each such
                Participant will receive an allocation in the ratio that his or
                her excess compensation bears to the excess Compensation of all
                Participants. Participants may only receive an allocation of 3%
                of excess Compensation.



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           (iii)Next, any remaining Employer contributions and forfeitures will
                be allocated to all Participants in the ratio that their
                Compensation plus excess Compensation bears to the total
                Compensation plus excess Compensation of all Participants.
                Participants may only receive an allocation of up to 2.7% of
                their Compensation plus excess Compensation, under this
                allocation method. If the Taxable Wage Base defined at Section
                3(j) is less than or equal to the greater of $10,000 or 20% of
                the maximum, the 2.7% need not be reduced. If the amount
                specified is greater than the greater of $10,000 or 20% of the
                maximum Taxable Wage Base, but not more than 80%, 2.7% must be
                reduced to 1.3%. If the amount specified is greater than 80%
                but less than 100% of the maximum Taxable Wage Base, the 2.7%
                must be reduced to 2.4%.

      NOTE:          If the Plan is not Top-Heavy or if the Top-Heavy minimum 
                     contribution or benefit is provided under another Plan
                     [see Section 11(c)(ii)] covering the same Employees, 
                     sub-paragraphs (i) and (ii) above may be disregarded and 
                     5.7%, 4.3% or 5.4% may be substituted for 2.7%, 1.3% or 
                     2.4% where it appears in (iii) above.

           (iv) Next, any remaining Employer contributions and forfeitures will
                be allocated to all Participants (whether or not they received
                an allocation under the preceding paragraphs) in the ratio that
                each Participant's Compensation bears to all Participants'
                Compensation.

[ ]  (g)   Additional Employer Contribution-Alternative Integrated Allocation 
           Formula [See paragraph (h) and (i)]

           The Employer shall have the right to make an additional
           discretionary contribution. To the extent that such contributions
           are sufficient, they shall be allocated as follows:

           ____% of each eligible Participant's Compensation plus ____% of
           Compensation in excess of the Taxable Wage Base defined at Section
           3(j) hereof. The percentage on excess compensation may not exceed
           the lesser of (i) the amount first specified in this paragraph or
           (ii) the greater of 5.7% or the percentage rate of tax under Code
           Section 3111(a) as in effect on the first day of the Plan Year
           attributable to the Old Age (OA) portion of the OASDI provisions of


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           the Social Security Act. If the Employer specifies a Taxable Wage
           Base in Section 3(j) which is lower than the Taxable Wage Base for
           Social Security purposes (SSTWB) in effect as of the first day of
           the Plan Year, the percentage contributed with respect to excess
           Compensation must be adjusted. If the Plan's Taxable Wage Base is
           greater than the larger of $10,000 or 20% of the SSTWB but not more
           than 80% of the SSTWB, the excess percentage is 4.3%. If the Plan's
           Taxable Wage Base is greater than 80% of the SSTWB but less than
           100% of the SSTWB, the excess percentage is 5.4%.

      NOTE:     Only one plan maintained by the Employer may be integrated with
                Social Security.

      (h)  Allocation of Excess Amounts (Annual Additions)

           In the event that the allocation formula above results in an Excess
           Amount, such excess shall be:

           [X]  (i)  placed in a suspense account accruing no gains or losses 
                     for the benefit of the Participant.

           [ ] (ii)  reallocated as additional Employer contributions to
                     all other Participants to the extent that they do not have
                     any Excess Amount.

      (i)  Minimum Employer Contribution Under Top-Heavy Plans:

           For any Plan Year during which the Plan is Top-Heavy, the sum of the
           contributions and forfeitures as allocated to eligible Employees
           under paragraphs 7(d), 7(e), 7(f), 7(g) and 9 of this Adoption
           Agreement shall not be less than the amount required under paragraph
           14.2 of the Basic Plan Document #04. Top-Heavy minimums will be
           allocated to:

           [X]  (i)  all eligible Participants.

           [ ]  (ii) only eligible  non-Key  Employees who are Participants.

      (j)  Return of Excess Contributions and/or Excess Aggregate 
           Contributions:



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           In the event that one or more Highly Compensated Employees is
           subject to both the ADP and ACP tests and the sum of such tests
           exceeds the Aggregate Limit, the limit will be satisfied by reducing
           the:

           [X]   (i)  the ADP of the affected Highly Compensated Employees.

           [ ]  (ii)  the ACP of the affected Highly Compensated Employees.

           [ ] (iii)  a combination of the ADP and ACP of the affected Highly 
                      Compensated Employees.

8.    ALLOCATIONS TO TERMINATED EMPLOYEES

      (a)  For Plan Years beginning prior to 1990:

           [ ]   (i)  For Plan Years beginning prior to 1990, the Employer
                      will not allocate Employer related contributions to any
                      Participant who terminates employment during the Plan
                      Year.

           [ ]  (ii)  The Employer will allocate Employer related
                      contributions to Employees who terminate during the Plan
                      Year as a result of:

                      [ ] (1) Retirement.

                      [ ] (2) Disability.

                      [ ] (3) Death.

                      [ ] (4) Other termination provided that the
                              Participant has completed a Year of Service.

                      [ ] (5)  Other termination.

      (b)  For Plan Years beginning in 1990 and thereafter, the Employer will
           allocate Employer related contributions to any Participant who is
           credited with more than 500 Hours of Service or is employed on the


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           last day of the Plan Year without regard to the number of Hours of
           Service.

           The Employer will also allocate Employer related contributions to
           any Participant who terminates during the Plan Year without accruing
           the necessary Hours of Service if they terminate as a result of:

           [ ]   (i) Retirement.

           [ ]  (ii) Disability.

           [ ] (iii) Death.

9.    ALLOCATION OF FORFEITURES

      NOTE:     Subsections (a), (b) and (c) below apply to forfeitures of 
                amounts other than Excess Aggregate Contributions.

      (a)  Allocation Alternatives:

           If forfeitures are allocated to Participants, such allocation shall
           be done in the same manner as the Employer's contribution.

           [X]  (i)  Not Applicable.  All contributions are always fully vested.

           [ ] (ii)  Forfeitures shall be allocated to Participants in the same
                     manner as the Employer's contribution.

                     If allocation to other Participants is selected, the
                     allocation shall be as follows:

                [1]  Amount attributable to Employer discretionary 
                     contributions and Top-Heavy minimums will be allocated to:

                     [ ] all eligible Participants under the Plan.

                     [ ] only those Participants eligible for an allocation
                         of matching contributions in the current year.



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                [2]  Amounts attributable to Employer Matching contributions 
                     will be allocated to:

                     [ ] all eligible Participants.

                     [ ] only those Participants eligible for allocations of
                         matching contributions in the current year.

           [ ] (iii) Forfeitures shall be applied to reduce the Employer's 
                     contribution for such Plan Year.

           [ ]  (iv) Forfeitures shall be applied to offset administrative 
                     expenses of the Plan. If forfeitures exceed these 
                     expenses, (iii) above shall apply.

      (b)  Date for Reallocation:

      NOTE:     If no distribution has been made to a former Participant,
                sub-section (i) below will apply to such Participant even if
                the Employer elects (ii), (iii) or (iv) below as its normal
                administrative policy.

           [ ]   (i) Forfeitures shall be reallocated at the end of the Plan 
                     Year during which the former Participant incurs his or her 
                     fifth consecutive one year Break In Service.

           [ ]  (ii) Forfeitures will be reallocated immediately (as of the 
                     next Valuation Date).

           [ ] (iii) Forfeitures shall be reallocated at the end of the Plan 
                     Year during which the former Employee incurs his or her 
                     (1st, 2nd, 3rd, or 4th) consecutive one year Break In
                     Service.

           [ ] (iv)  Forfeitures  will be reallocated immediately (as of the 
                     Plan Year end).

      (c)  Restoration of Forfeitures:

           If amounts are forfeited prior to five consecutive 1-year Breaks in
           Service, the Funds for restoration of account balances will be
           obtained from the following resources in the order indicated (fill
           in the appropriate number):



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           [ ]   (i) Current year's forfeitures.

           [ ]  (ii) Additional Employer contribution.

           [ ] (iii) Income or gain to the Plan.

      (d)  Forfeitures of Excess Aggregate Contributions shall be:

           [ ]   (i) Applied to reduce Employer contributions.

           [ ]  (ii) Allocated, after all other forfeitures under the Plan, to 
                     the Matching Contribution  account of each  non-Highly
                     Compensated Participant who made Elective Deferrals or 
                     Voluntary Contributions in the ratio which each such 
                     Participant's Compensation for the Plan Year bears to the 
                     total Compensation of all Participants for such Plan Year.
                     Such forfeitures cannot be allocated to the account of any
                     Highly Compensated Employee.

           Forfeitures of Excess Aggregate Contributions will be so applied at
           the end of the Plan Year in which they occur.

10.   CASH OPTION

      [ ]  (a)  The Employer may permit a Participant to elect to defer to the 
                Plan, an amount not to exceed ____% of any Employer paid cash
                bonus made for such Participant for any year. A Participant 
                must file an election to defer such  contribution at least 
                fifteen (15) days prior to the end of the Plan Year.  If the 
                Employee fails to make such an election, the entire Employer 
                paid cash bonus to which the Participant would be entitled 
                shall be paid as cash and not to the Plan.  Amounts deferred 
                under this section shall be treated for all purposes as 
                Elective Deferrals.  Notwithstanding the above, the election to
                defer must be made before the bonus is made available to the 
                Participants.

      [X]  (b)  Not Applicable.




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11.   LIMITATIONS ON ALLOCATIONS

      [ ]  This is the only Plan the Employer maintains or ever maintained;
           therefore, this section is not applicable.

      [X]  The Employer does maintain or has maintained another Plan (including
           a Welfare Benefit Fund or an individual medical account [as defined
           in Code Section 415(l)(2)], under which amounts are treated as
           Annual Additions) and has completed the proper sections below.

           Complete (a), (b) and (c) only if the Employer maintains or ever
           maintained another qualified plan, including a Welfare Benefit Fund
           or an individual medical account [asdefined in Code Section
           415(l)(2)], in which any Participant in this Plan is (or was) a
           participant or could possibly become a participant.

      (a)  If the Participant is covered under another qualified Defined
           Contribution Plan maintained by the Employer, other than a Master or
           Prototype
           Plan:

           [ ]   (i)  the provisions of Article X of the Basic Plan
                      Document #04 will apply, as if the other plan were a
                      Master or Prototype Plan.

           [ ]  (ii)  Attach provisions stating the method under which the 
                      plans will limit total Annual Additions to the Maximum
                      Permissible Amount, and will properly reduce any Excess
                      Amounts, in a manner that precludes Employer discretion.

      (b)  If a Participant is or ever has been a participant in a Defined
           Benefit Plan maintained by the Employer:

           Attach provisions which will satisfy the 1.0 limitation of Code
           Section 415(e). Such language must preclude Employer discretion. The
           Employer must also specify the interest and mortality assumptions
           used in determining Present Value in the Defined Benefit Plan.

      (c)  The minimum contribution or benefit required under Code Section 416 
           relating to Top-Heavy Plans shall be satisfied by:



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           [ ]   (i) this Plan.

           [ ]  (ii) ___________________________________
                     Name of other qualified plan of the Employer).

           [ ] (iii) Attach provisions stating the method under which the 
                     minimum contribution and benefit provisions of Code 
                     Section 416 will be satisfied.  If a Defined Benefit
                     Plan is or was maintained, an attachment must be provided 
                     showing interest and mortality assumptions used in the
                     Top-Heavy Ratio.

12.   VESTING

      Employees shall have a fully vested and nonforfeitable interest in any
      Employer contribution and the investment earnings thereon made in
      accordance with paragraphs (select one or more options) [ ] 7(c), [ ]
      7(e), [ ] 7(f), [ ] 7(g) and [ ] 7(i) hereof. Contributions under
      paragraph 7(b), 7(c)(vii) and 7(d) are always fully vested. If one or
      more of the foregoing options are notselected, such Employer
      contributions shall be subject to the vesting table selected by the
      Employer.

      Each Participant shall acquire a vested and nonforfeitable percentage in
      his or her account balance attributable to Employer contributions and the
      earnings thereon under the procedures selected below except with respect
      to any Plan Year during which the Plan is Top-Heavy, in which case the
      Two-twenty vesting schedule [Option (b)(iv)] shall automatically apply
      unless the Employer has already elected a faster vesting schedule. If the
      Plan is switched to option (b)(iv), because of its Top-Heavy status, that
      vesting schedule will remain in effect even if the Plan later becomes
      non-Top-Heavy until the Employer executes an amendment of this Adoption
      Agreement indicating otherwise.

      (a)  Computation Period:

           The computation period for purposes of determining Years of Service
           and Breaks in Service for purposes of computing a Participant's
           nonforfeitable right to his or her account balance derived from
           Employer contributions:

           [X]   (i) shall not be applicable since Participants are always 
                     fully vested,



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           [ ]  (ii) shall commence on the date on which an Employee first 
                     performs an Hour of Service for the Employer and each 
                     subsequent 12-consecutive month period shall commence on 
                     the anniversary thereof, or

           [ ] (iii) shall commence on the first day of the Plan Year during 
                     which an Employee first performs an Hour of Service for 
                     the Employer and each subsequent 12-consecutive month
                     period shall commence on the anniversary thereof.

           A Participant shall receive credit for a Year of Service if he or
           she completes at least 1,000 Hours of Service [or if lesser, the
           number of hours specified at 3(l)(iii) of this Adoption Agreement]
           at any time during the 12-consecutive month computation period.
           Consequently, a Year of Service may be earned prior to the end of
           the 12-consecutive month computation period and the Participant need
           not be employed at the end of the 12-consecutive month computation
           period to receive credit for a Year of Service.

      (b)  Vesting Schedules:

      NOTE:     The vesting schedules below only apply to a Participant who has
                at least one Hour of Service during or after the 1989 Plan 
                Year.  If applicable, Participants who separated from Service 
                prior to the 1989 Plan Year will remain under thevesting 
                schedule as in effect in the Plan prior to amendment for the 
                Tax Reform Act of 1986.

           (i)  Full and immediate vesting.
                     Years of Service
                     ----------------
                       1    2    3     4    5     6    7
                     ---  ---  ---   ---  ---   ---  ---
           (ii)      ___% 100%

           (iii)     ___% ___% 100%

           (iv)      ___%  20%  40%   60%  80%  100%

           (v)       ___% ___%  20%   40%  60%   80% 100%

           (vi)       10%  20%  30%   40%  60%   80% 100%

           (vii)     ___% ___% ___%  ___% 100%

           (viii)    ___% ___% ___%  ___% ___%  ___% 100%



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      NOTE:     The percentages selected for schedule (viii) may not be less 
                for any year than the percentages shown at schedule (v).

           [ ]  All contributions other than those which are fully vested
                when contributed will vest under schedule above.

           [ ]  Contributions other than those which are fully vested when
                contributed will vest as provided below:

                   Vesting
                Option Selected              Type Of Employer Contribution

                ____                         7(c) Employer Match
                                             on Salary Savings

                ____                         7(c) Employer Match on
                                             Employee Voluntary

                ____                         7(e) Employer Discretionary

                ____                         7(f) & (g) Employer
                                             Discretionary - Integrated

      (c)  Service disregarded for Vesting:

           [X]   (i) Not Applicable.  All Service shall be considered.

           [ ]  (ii) Service prior to the Effective Date of this Plan or a 
                     predecessor plan shall be disregarded when computing a
                     Participant's vested and nonforfeitable interest.

           [ ] (iii) Service prior to a Participant having attained age
                     18 shall be disregarded when computing a Participant's
                     vested and nonforfeitable interest.

13.   SERVICE WITH PREDECESSOR ORGANIZATION

      For purposes of satisfying the Service requirements for eligibility,
      Hours of Service shall include Service with the following predecessor
      organization(s): 
      (These hours will also be used for vesting purposes.)




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14.   ROLLOVER/TRANSFER CONTRIBUTIONS

      (a)  Rollover Contributions, as described at paragraph 4.3 of the Basic
           Plan Document #04, [X] shall [ ] shall not be permitted. If
           permitted, Employees [X] may [ ] may not make Rollover Contributions
           prior to meeting the eligibility requirements for participation in
           the Plan.

      (b)  Transfer Contributions, as described at paragraph 4.4 of the Basic
           Plan Document #04 [X] shall [ ] shall not be permitted. If
           permitted, Employees [X] may [ ] may not Transfer Contributions
           prior to meeting the eligibility requirements for participation in
           the Plan.

      NOTE:     Even if available, the Employer may refuse to accept such 
                contributions if its Plan meets the safe-harbor rules of 
                paragraph 8.7 of the Basic Plan Document #04.

15.   HARDSHIP WITHDRAWALS

      Hardship withdrawals, as provided for in paragraph 6.9 of the Basic Plan
      Document #04, [X] are [ ] are not permitted.

16.   PARTICIPANT LOANS

      Participant loans, as provided for in paragraph 13.5 of the Basic Plan
      Document #04, [X] are [ ] are not permitted. If permitted, repayments of
      principal and interest shall be repaid to [X] the Participant's
      segregated account or [ ] the general Fund.

17.   RESERVED

18.   EMPLOYER INVESTMENT DIRECTION

      The Employer investment direction provisions, as set forth in paragraph
      13.7 of the Basic Plan Document #04, [ ] shall [X] shall not be
      applicable.




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19.   EMPLOYEE INVESTMENT DIRECTION

      (a)  The Employee investment direction provisions, as set forth in
           paragraph 13.8 of the Basic Plan Document #04, [X] shall [ ] shall
           not be applicable.

           If applicable, Participants may direct their investments among funds
           offered by the Trustee.

      (b)  Participants may direct the following kinds of contributions and the
           earnings thereon (check all applicable):

           [X]    (i) All Contributions.

           [ ]   (ii) Elective Deferrals.

           [ ]  (iii) Employee Voluntary Contributions (after-tax).

           [ ]   (iv) Employee Mandatory Contributions (after-tax).

           [ ]    (v) Employer Qualified Matching Contributions.

           [ ]   (vi) Other Employer Matching Contributions.

           [ ]  (vii) Employer Qualified Non-Elective Contributions.

           [ ] (viii) Employer Discretionary Contributions.

           [ ]   (ix) Rollover Contributions.

           [ ]    (x) Transfer Contributions.

           [X]   (xi) All of above which are checked, but only to the extent 
                      that the Participant is vested in those contributions.

      NOTE:     To the extent Employee investment direction was previously
                allowed, the Trustee shall have the right to either make the
                assets part of the general Trust, or leave them as separately
                invested subject to the rights of paragraph 13.8.

                The Plan [x] is [ ] is not intended to constitute a plan
                described in section 404(c) of the Employee Retirement Income
                Security Act and regulations thereunder. If the Plan is


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                intended to constitute an ERISA section 404(c) plan, the
                fiduciaries of the plan may be relieved of liability for any
                losses which are the direct and necessary result of investment
                instructions given by a Participant.

20.   EARLY PAYMENT OPTION

      (a)  A Participant who separates from Service prior to retirement, death
           or Disability [X] may [ ] may not make application to the Employer
           requesting an early payment of his or her vested account balance.

      (b)  A Participant who has attained age 59-1/2 and who has not separated
           from Service [X] may [ ] may not obtain a distribution of his or her
           vested Employer contributions. Distribution can only be made if the
           Participant is 100% vested.

      (c)  A Participant who has attained the Plan's Normal Retirement Age and
           who has not separated from Service [X] may [ ] may not receive a
           distribution of his or her vested account balance.

      NOTE:     If the Participant has had the right to withdraw his or her 
                account balance in the past, this right may not be taken away.
                Notwithstanding the above, to the contrary, required minimum 
                distributions will be paid.  For timing of distributions, see 
                item 21(a) below.

21.   DISTRIBUTION OPTIONS

      (a)  Timing of Distributions:

           In cases of termination for other than death, Disability or
           retirement, benefits shall be paid:

           [ ]   (i) As soon as administratively feasible, following the
                     close of the valuation period during which a distribution
                     is requested or is otherwise payable.

           [ ]  (ii) As soon as administratively feasible following the
                     close of the Plan Year during which a distribution is
                     requested or is otherwise payable.


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           [X]  (iii) As soon as administratively feasible, following the
                      date on which a distribution is requested or is otherwise
                      payable.

           [ ]   (iv) As soon as administratively feasible, after the close of 
                      the Plan Year during which the Participant incurs
                      consecutive one-year Breaks in Service.

           [ ]    (v) Only after the Participant has achieved the Plan's Normal 
                      Retirement Age, or Early Retirement Age, if applicable.

           In cases of death, Disability or retirement, benefits shall be paid:

           [ ]   (vi) As soon as administratively feasible, following the
                      close of the valuation period during which a distribution
                      is requested or is otherwise payable.

           [ ]  (vii) As soon as administratively feasible following the close 
                      of the Plan Year during which a distribution is requested 
                      or is otherwise payable.

           [X] (viii) As soon as administratively feasible, following the
                      date on which a distribution is requested or is otherwise
                      payable.

      (b)  Optional Forms of Payment:

           [X]    (i) Lump Sum.

           [ ]   (ii) Installment Payments.

           [ ]  (iii) Life Annuity*.

           [ ]   (iv) Life Annuity Term Certain*. Life Annuity with payments 
                      guaranteed for _____________ years (not to exceed 20 
                      years, specify all applicable).

           [ ]    (v) Joint and [ ] 50%, [ ] 66-2/3%, [ ] 75% or [ ] 100%
                      survivor annuity* (specify all applicable).

           [ ]   (vi) Other form(s) specified:________________




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           *Not available in Plan meeting provisions of paragraph 8.7 of Basic
           Plan Document #04.

      (c)  Recalculation of Life Expectancy:

           In determining required distributions under the Plan, Participants
           and/or their Spouse (Surviving Spouse) [X] shall [ ] shall not have
           the right to have their life expectancy recalculated annually.

           If "shall",

           [ ]  only the Participant shall be recalculated.

           [ ]  both the Participant and Spouse shall be recalculated.

           [X]  who is recalculated shall be determined by the Participant.

22.   SPONSOR CONTACT

      Employers should direct questions concerning the language contained in
      and qualification of the Prototype to:

      DANIEL T. NOTARTOMASO
      (Job Title)  SENIOR MANAGER
      (Phone Number)  (617) 575-2151

      In the event that the Sponsor amends, discontinues or abandons this
      Prototype Plan, notification will be provided to the Employer's address
      provided on the first page of this Agreement.

23.   SIGNATURES

      DUE TO THE SIGNIFICANT TAX RAMIFICATIONS, THE SPONSOR RECOMMENDS THAT
      BEFORE YOU EXECUTE THIS ADOPTION AGREEMENT, YOU CONTACT YOUR ATTORNEY OR
      TAX ADVISOR, IF ANY.

      (a)  EMPLOYER:

           Name and address of Employer if different than specified in Section
           1 above.




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           This agreement and the corresponding provisions of the Plan and
           Trust/Custodial Account Basic Plan Document #04 were adopted by the
           Employer the 15th
           day of October, 1996.

           Signed for the Employer by:    Paul V. Cusick

           Title:                         Vice President

           Signature:                     /s/ Paul V. Cusick
                                         --------------------

           THE EMPLOYER UNDERSTANDS THAT ITS FAILURE TO PROPERLY COMPLETE THE
           ADOPTION AGREEMENT MAY RESULT IN DISQUALIFICATION OF ITS PLAN.

           Employer's Reliance: An Employer who maintains or has ever
           maintained or who later adopts any Plan [including, after December
           31, 1985, a Welfare Benefit Fund, as defined in Section 419(e) of
           the Code, which provides post-retirement medical benefits allocated
           to separate accounts for Key Employees, as defined in Section
           419A(d)(3)] or an individual medical account, as defined in Code
           Section 415(l)(2) in addition to this Plan may not rely on the
           opinion letter issued by the National Office of the Internal Revenue
           Service as evidence that this Plan is qualified under Section 401 of
           the Code. If the Employer who adopts or maintains multiple Plans
           wishes to obtain reliance that such Plan(s) are qualified,
           application for a determination letter should be made to the
           appropriate Key District Director of Internal Revenue. The Employer
           understands that its failure to properly complete the Adoption
           Agreement may result in disqualification of its plan.

           This Adoption Agreement may only be used in conjunction with Basic
           Plan Document #04.

           The Employer may not rely on the opinion letter issued by the
           National Office of the Internal Revenue Service as evidence that
           this Plan is qualified under Section 401 of the Code unless the
           terms of the Plan, as herein adopted or amended, that pertain to the
           requirements of Sections 401(a)(4), 401(a)(17), 401(l), 401(a)(5),
           410(b) and 414(s) of the Code, as amended by the Tax Reform Act of


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           1986, or later laws, (a) are made effective retroactively to the
           first day of the first Plan Year beginning after December 31, 1988
           (or such later date on which these requirements first become
           effective with respect to this Plan); or (b) are made effective no
           later than the first day on which the Employer is no longer
           entitled, under regulations, to rely on a reasonable, good faith
           interpretation of these requirements, and the prior provisions of
           the Plan constitute such an interpretation.

      [X]  (b)  TRUSTEE:

                Name of Trustee:

                THE FIRST NATIONAL BANK OF BOSTON

                The assets of the Fund shall be invested in accordance with
                paragraph 13.3 of the Basic Plan Document #04 as a Trust. As
                such, the Employer's Plan as contained herein was accepted by
                the Trustee the 22nd day of November, 1996.

      Signed for the Trustee by:        Daniel T. Notartomaso

      Title:                            Senior Manager

      Signature:                        /s/ Daniel T. Notartomaso
                                        --------------------------

      [ ] (c)  CUSTODIAN:

                Name of Custodian:



                The assets of the Fund shall be invested in accordance with
                paragraph 13.4 of the Basic Plan Document #04 as a Custodial
                Account. As such, the Employer's Plan as contained herein was
                accepted by the Custodian the day of ____________, 19___.

      Signed for the Custodian by:

      Title:

      Signature:         ____________________     ____________________



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           (d)  SPONSOR:

                The Employer's Agreement and the corresponding provisions of 
                the Plan and Trust/Custodial Account Basic Plan Document #04 
                were accepted by the Sponsor the 22nd day of November, 1996.

      Signed for the Sponsor by:        Daniel T. Notartomaso

      Title:                            Senior Manager

      Signature:                        /s/ Daniel T. Notartomaso
                                        --------------------------



Century Bancorp, Inc.
400 Mystic Avenue
Medford, MA  02155

Standardized Adoption Agreement
Prototype Cash or Deferred Profit Sharing Plan and Trust/Custodial 
Agreement

Item 11(b)

The Defined Benefit Retirement Plan will be tested for Code Section 415(e)
limitation. Any problems with the 415(e) limitation will be corrected by
reducing the Defined Benefit Plan benefit.