MFS SERIES TRUST, 497J, 1997-05-08

MFS SERIES TRUST
497J, 1997-05-08

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                              THE MFS SERIES TRUST
               500 Boylston Street Boston Massachusetts 02116-3741
                                  617 954 5000




                                            May 8, 1997



VIA EDGAR

Securities and Exchange Commission
Judiciary Plaza
450 Fifth Street, NW
Washington, DC  20549

         Re:  The MFS  Series  Trust  (the  "Trust")  (File No.  33-64010)  on
               behalf of MFS Aggressive Small Cap Equity Fund (the "Fund")

Ladies and Gentlemen:

         On May 7, 1997,  the Trust made a filing  pursuant to Rule 497(j) under
the Securities Act of 1933, as amended (Accession Number  0000912938-97-000282).
Because the Prospectus for the Fund  contained  certain  changes from that filed
with  Post-Effective  Amendment No. 8 for the Trust,  the definitive  Prospectus
will be provided under separate cover pursuant to Rule 497(c).

         Please call the undersigned or Annamarie  D'Angelo at (617) 954-5180 or
(800) 343-2829 with any questions you may have.

                                            Very truly yours,


                                            JAMES F. DESMARAIS
                                            James F. DesMarais
                                            Assistant Secretary Pro Tempore

JFD/bjn