MFS SERIES TRUST X
497, 1997-01-06
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                MFS/FOREIGN & COLONIAL INTERNATIONAL GROWTH FUND
           MFS/FOREIGN & COLONIAL INTERNATIONAL GROWTH AND INCOME FUND
               MFS/FOREIGN & COLONIAL EMERGING MARKETS EQUITY FUND

                   SUPPLEMENT TO THE OCTOBER 1, 1996 PROSPECTUS AND 
                         STATEMENT OF ADDITIONAL INFORMATION


     THE FOLLOWING  INFORMATION  SHOULD BE READ IN  CONJUNCTION  WITH THE FUNDS'
PROSPECTUS  AND STATEMENT OF ADDITIONAL  INFORMATION  ("SAI"),  DATED OCTOBER 1,
1996, AND CONTAINS A DESCRIPTION OF CLASS I SHARES.

     CLASS I SHARES ARE  AVAILABLE  FOR  PURCHASE  ONLY BY CERTAIN  INVESTORS AS
DESCRIBED UNDER THE CAPTION "ELIGIBLE PURCHASERS" BELOW.

EXPENSE SUMMARY

                                                             CLASS I

                                                       INTERNATIONAL   EMERGING
                                         INTERNATIONAL  GROWTH AND     MARKETS
                                          GROWTH FUND   INCOME FUND  EQUITY FUND
SHAREHOLDER TRANSACTION EXPENSES:
   Maximum Initial Sales Charge Imposed
     on Purchases of Fund Shares (as a 
     percentage of offering price).....      None          None          None
   Maximum Contingent Deferred Sales
     Charge (as a percentage of original
     purchase price or redemption proceeds, 
     as applicable).....................     None          None          None

                                                       INTERNATIONAL   EMERGING
                                         INTERNATIONAL  GROWTH AND     MARKETS
                                          GROWTH FUND   INCOME FUND  EQUITY FUND

ANNUAL OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE DAILY NET ASSETS):
     Management Fees....................   0.975%          0.975%       1.25%
     Rule 12b-1 Fees....................    None            None          None
     Other Expenses (after expense 
      reimbursement)(1)(2)..............   0.765%          1.045%       0.75%(3)
                                           -----           -----         ---- 
     Total Operating Expenses (after 
       expense reimbursement)...........   1.74%           2.02%        2.00%(3)
 ...............
(1)  "Other  Expenses" is based on Class A expenses  incurred  during the period
     ended May 31, 1996.
(2)  Each Fund has an  expense  offset  arrangement  which  reduces  the  Fund's
     custodian fee based upon the amount of cash maintained by the Fund with its
     custodian  and  dividend  disbursing  agent,  and may enter into other such
     arrangements and directed brokerage arrangements (which would also have the
     effect of reducing the Fund's  expenses).  Any such fee  reductions are not
     reflected under "Other Expenses."
(3)  MFS has agreed to bear,  subject to  reimbursement  by the Emerging Markets
     Equity Fund,  until  December  31, 2005,  expenses of Class I shares of the
     Fund such that the aggregate  expenses of the Emerging  Markets Equity Fund
     do not exceed 2.00% of the Fund's average daily net assets  attributable to
     Class I shares on an annualized  basis.  This arrangement may be terminated
     or revised by MFS at any time. (See "Other Information" below.) Absent this
     expense  arrangement,  estimated  "Other  Expenses"  and  "Total  Operating
     Expenses"  for the Emerging  Markets  Equity Fund's Class I shares would be
     1.17% and 2.42%, respectively.
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                               EXAMPLE OF EXPENSES

     An investor would pay the following  dollar amounts of expenses on a $1,000
investment  in Class I shares of each Fund,  assuming (a) a 5% annual return and
(b) redemption at the end of each of the time periods indicated:

                                                          CLASS I

                                               INTERNATIONAL          EMERGING
                          INTERNATIONAL         GROWTH AND              MARKETS
     PERIOD                GROWTH FUND          INCOME FUND         EQUITY FUND

     1 year...........        $18                   $21                  $20
     3 years..........         55                    63                   63

     The  purpose  of  the  expense  table  above  is  to  assist  investors  in
understanding  the various costs and expenses  that a  shareholder  of each Fund
will bear directly or  indirectly.  A more complete  description  of each Fund's
management  fee is set forth under the caption  "Management of the Funds" in the
Prospectus.

THE "EXAMPLE" SET FORTH ABOVE SHOULD NOT BE CONSIDERED A REPRESENTATION  OF PAST
OR FUTURE  EXPENSES OF THE FUNDS;  ACTUAL  EXPENSES  MAY BE GREATER OR LESS THAN
THOSE SHOWN.

ELIGIBLE PURCHASERS

Class I shares of each Fund are  available  for purchase  only by the  following
purchasers ("Eligible Purchasers"):

(i)  certain  retirement  plans  established  for the  benefit of  employees  of
     Massachusetts  Financial  Services Company ("MFS"),  the Fund's  investment
     adviser, and employees of MFS' affiliates;

(ii) any fund distributed by MFS Fund  Distributors,  Inc.  ("MFD"),  the Fund's
     distributor,  if the fund  seeks to achieve  its  investment  objective  by
     investing  primarily in shares of the Fund and other funds  distributed  by
     MFD;

(iii)any  retirement  plan  which (a)  purchases  shares  directly  through  MFD
     (rather  than  through a third  party  broker or dealer or other  financial
     intermediary);  (b)  has,  at the  time of  purchase  of  Class  I  shares,
     aggregate  assets of at least $100  million;  and (c)  invests at least $10
     million in Class I shares of the Fund either alone or in  combination  with
     investments  in  Class I shares  of  other  MFS  funds  distributed  by MFD
     (additional  investments may be made in any amount);  provided that MFD may
     accept  purchases from smaller plans or in smaller  amounts if it believes,
     in its sole  discretion,  that the plan's  aggregate  assets  will equal or
     exceed  $100  million,  or that the plan will make  additional  investments
     which  will  cause its total  investment  to equal or exceed  $10  million,
     within a reasonable period of time; and

(iv) bank trust  departments  which initially  invest,  on behalf of their trust
     clients,  at  least  $100,000  in Class I  shares  of the Fund  (additional
     investments  may be made  in any  amount);  provided  that  MFD may  accept
     smaller initial purchases if it believes, in its sole discretion,  that the
     bank trust  department will make additional  investments,  on behalf of its
     trust  clients,  which will cause its total  investment  to equal or exceed
     $100,000 within a reasonable period of time.

In no event  will a Fund,  MFS,  MFD or any of their  affiliates  pay any  sales
commissions or  compensation  to any third party in connection  with the sale of
Class I shares; the payment of any such sales commission or compensation  would,
under the Fund's policies,  disqualify the purchaser as an eligible  investor of
Class I shares.

SHARE CLASSES OFFERED BY THE FUNDS

     Four classes of shares of each Fund currently are offered for sale, Class A
shares,  Class B shares,  Class C shares and Class I shares.  Class I shares are
available for purchase only by Eligible  Purchasers,  as defined above,  and are
described in this Supplement.  Class A shares, Class B shares and Class C shares
are  described in the Funds'  Prospectus  and are  available for purchase by the
general public.

     Class A shares are offered at net asset value plus an initial  sales charge
up to a maximum of 4.75% of the offering  price (or a contingent  deferred sales
charge (a "CDSC") upon  redemption of 1.00% during the first year in the case of
purchases of $1 million or more and certain purchases by retirement  plans), and
are  subject to an annual  distribution  fee and  service fee up to a maximum of
0.50% per  annum.  Class B shares  are  offered  at net asset  value  without an
initial sales charge but are subject to a CDSC upon  redemption  (declining from
4.00%  during the first  year to 0% after six years) and an annual  distribution
fee and service fee up to a maximum of 1.00% per annum;  Class B shares  convert
to Class A shares  approximately eight years after purchase.  Class C shares are
offered at net asset value  without an initial sales charge but are subject to a
CDSC upon  redemption of 1.00% during the first year and an annual  distribution
fee and  service  fee up to a maximum  of 1.00% per  annum.  Class I shares  are
offered at net asset value  without an initial  sales charge or CDSC and are not
subject  to a  distribution  or service  fee.  Class C and Class I shares do not
convert to any other class of shares of the Funds.

OTHER INFORMATION

     Eligible  Purchasers may purchase Class I shares only directly through MFD.
Eligible  Purchasers may exchange Class I shares of each Fund for Class I shares
of any other MFS Fund  available  for purchase by such  Eligible  Purchasers  at
their net asset value (if available for sale),  and may exchange  Class I shares
of the Fund for shares of the MFS Money Market Fund (if available for sale), and
may redeem Class I shares of the Fund at net asset value.  Distributions paid by
the Fund with  respect to Class I shares  generally  will be greater  than those
paid with respect to Class A shares,  Class B shares and Class C shares  because
expenses  attributable  to Class A  shares,  Class B shares  and  Class C shares
generally will be higher.

     MFS has agreed to bear,  subject to  reimbursement  by the Emerging Markets
Equity Fund,  until  December  31, 2005,  expenses of Class I shares of the Fund
such that the  aggregate  expenses of the  Emerging  Markets  Equity Fund do not
exceed  2.00% of the Fund's  average  daily net assets  attributable  to Class I
shares on an annualized  basis. This arrangement may be terminated or revised by
MFS at any time.  Such  payments  by MFS are  subject  to  reimbursement  by the
Emerging  Markets Equity Fund which will be  accomplished  by the payment by the
Fund of an  expense  reimbursement  fee to MFS  computed  and paid  monthly as a
percentage  of its average  daily net assets for its then  current  fiscal year,
with a limitation that  immediately  after such payment the aggregate  operating
expenses  of the Fund would not exceed the  amounts  set forth in the  preceding
sentence.  The expense reimbursement  agreement terminates on the earlier of the
date on which payments made thereunder by the Emerging Markets Equity Fund equal
the prior payment of such reimbursable expenses by MFS or December 31, 2005.

                 THE DATE OF THIS SUPPLEMENT IS JANUARY 1, 1997


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