Volvarina socoae J. Espinosa & J.A. Ortea,1999 Costa Rica10,46 mm
Volvarina sofiae J.A. Ortea & J. Espinosa,1998
Marginella solitaria (FOSSIL) R.J.L. Guppy, 1896 † Trinidad and Tobago, Couva-Tabaquite-Talparo
Dentimargo somalica T. Cossignani, 2001
Volvarina somalica F. Boyer, 2015
Volvarina somwangi F. Boyer, 2015
Hydroginella sordida (L.A. Reeve, 1865) Mauritius9,7 mm
Eratoidea sotaventensis T. McCleery, 2011 Venezuela
Volvarina southwicki (C.A. Davis, 1904) Bermuda
Volvarina sowerbyana (S.A.A. Petit De La Saussaye, 1851)
Hyalina sowerbyi W.H. Turton, 1932
Marginella sowerbyi (FOSSIL) W.M. Gabb, 1873 † Dominican Republic, La Vega
Marginella spadix S.G. Veldsman, 2016
Dentimargo spengleri M. Lussi, 2007 South Africa, KwaZulu, Natal4,7 mm
Marginella spengleri A. Aiken, 2014 South Africa, Natal, Durban Bay11 mm
Marginella spinacia S. Gofas & F. Fernandes,1988 Sao Tomè Island11 mm
Marginella spiralineata B. Hayes, 1994 South Africa, Algoa Bay25,5 mm
Volvarina splendida T. Cossignani, 2005 Mexico, Yucatan12 mm
Dentimargo spongiarum F. Boyer, 2001 New Caledonia
Prunum springvalensis (FOSSIL) C.J. Maury, 1925 † Trinidad and Tobago, Sangre Grande
Serrata spryi (P.W. Clover, 1974) Mozambique, Nacala Bay9 mm
Eratoidea statiola T. McCleery, 2011 Venezuela, Monjes del Sur
Marginella stephaniae (FOSSIL) E.M. Da Costa, 1867 † Portugal, Algarve33 mm
Marginella stephmani S.G. Veldsman & A. Aiken,2012 South Africa, Coffee Bay20,2 mm
Dentimargo stewartiana (H.H. Suter, 1908) New Zealand, Stewart Island6,7 mm
Mesoginella stilla (C. Hedley, 1903) Australia, Port Kembla6,2 mm
Prunum storeria (J.P.Y. Couthouy, 1837) South Australia17,3 mm
Mesoginella strangei (G.F. Angas, 1877) Australia, Twofold Bay3,5 mm
Cryptospira strigata (L.W. Dillwyn, 1817) Thailand, Phuket44 mm
Cryptospira strigata unicolor J.J. Bert, 1985 Thailand47,7 mm
Marginella strombiformis (FOSSIL) (J.E. Tenison-Woods,1877 †) Tasmania15 mm
Marginella stuarti R.N. Kilburn, 1977 Namibia13 mm
Serrata stylaster (F. Boyer, 2001) New Caledonia, Stylaster Bank4,7 mm
Volvarina styria (W.H. Dall, 1889) Bahamas
Dentimargo suavis (S.M. Souverbie, 1859) New Caledonia, Lifou5 mm