[ARTICLE] 6
[CIK] 0000880583
[NAME] THE TRAVELERS SERIES TRUST
[SERIES]
   [NUMBER] 19
   [NAME] MFS RESEARCH PORTFOLIO
<TABLE>
<S>                             <C>
[PERIOD-TYPE]                   YEAR
[FISCAL-YEAR-END]                          DEC-31-1998
[PERIOD-END]                               DEC-31-1998
[INVESTMENTS-AT-COST]                       33,641,215
[INVESTMENTS-AT-VALUE]                      37,810,039
[RECEIVABLES]                                  339,542
[ASSETS-OTHER]                                  86,499
[OTHER-ITEMS-ASSETS]                                 0
[TOTAL-ASSETS]                              38,236,080
[PAYABLE-FOR-SECURITIES]                       307,596
[SENIOR-LONG-TERM-DEBT]                              0
[OTHER-ITEMS-LIABILITIES]                       58,043
[TOTAL-LIABILITIES]                            365,639
[SENIOR-EQUITY]                                      0
[PAID-IN-CAPITAL-COMMON]                    34,373,018
[SHARES-COMMON-STOCK]                        3,587,001
[SHARES-COMMON-PRIOR]                                0
[ACCUMULATED-NII-CURRENT]                       11,957
[OVERDISTRIBUTION-NII]                               0
[ACCUMULATED-NET-GAINS]                        659,451
[OVERDISTRIBUTION-GAINS]                             0
[ACCUM-APPREC-OR-DEPREC]                     4,168,831
[NET-ASSETS]                                37,870,441
[DIVIDEND-INCOME]                               97,086
[INTEREST-INCOME]                               60,722
[OTHER-INCOME]                                       0
[EXPENSES-NET]                                 110,916
[NET-INVESTMENT-INCOME]                         46,892
[REALIZED-GAINS-CURRENT]                       659,463
[APPREC-INCREASE-CURRENT]                    4,168,831
[NET-CHANGE-FROM-OPS]                        3,556,260
[EQUALIZATION]                                       0
[DISTRIBUTIONS-OF-INCOME]                       58,836
[DISTRIBUTIONS-OF-GAINS]                             0
[DISTRIBUTIONS-OTHER]                                0
[NUMBER-OF-SHARES-SOLD]                      3,675,328
[NUMBER-OF-SHARES-REDEEMED]                     93,898
[SHARES-REINVESTED]                              5,571
[NET-CHANGE-IN-ASSETS]                      37,870,441
[ACCUMULATED-NII-PRIOR]                              0
[ACCUMULATED-GAINS-PRIOR]                            0
[OVERDISTRIB-NII-PRIOR]                              0
[OVERDIST-NET-GAINS-PRIOR]                           0
[GROSS-ADVISORY-FEES]                           88,733
[INTEREST-EXPENSE]                                   0
[GROSS-EXPENSE]                                151,965
[AVERAGE-NET-ASSETS]                                 0
[PER-SHARE-NAV-BEGIN]                            10.00
[PER-SHARE-NII]                                  00.05
[PER-SHARE-GAIN-APPREC]                          00.53
[PER-SHARE-DIVIDEND]                             00.02
[PER-SHARE-DISTRIBUTIONS]                            0
[RETURNS-OF-CAPITAL]                                 0
[PER-SHARE-NAV-END]                              10.56
[EXPENSE-RATIO]                                  01.01
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
</TABLE>