Prunum saulcyanum (S.A.A. Petit De La Saussaye, 1851)
Volvarina sauliae (G.B. II Sowerby, 1846)
Marginella scalariformis P.L. Duclos
Eratoidea scalaris (F.P. Jousseaume, 1875)
Dentimargo scapulatus Boyer, 2017
Mesoginella schoutanica (W.L. May, 1913)
Hydroginella scintilla (F.P. Jousseaume, 1875)
Cryptospira scripta (R.B. Hinds, 1844)
Marginella sebastiani I. Marche-Marchad& J. Rosso, 1979
Volvarina sebastieni J. Espinosa & J.A. Ortea,2012
Marginella seccombei A. Wakefield, 2012
Marginella seguenzai (FOSSIL) R. La Perna & Vazzana,2016 †
Bullata semen (FOSSIL) (Lea, 1833 †)
Paolaura semistriata C. Smriglio & P. Mariottini,2001
Marginella senegalensis P.W. Clover, 1990
Marginella sergioi L. Bozzetti, 1997
Serrata serrata (J.S. Gaskoin, 1849)
Pugnus serrei (A.R.J.B. Bavay, 1911)
Volvarina serrei (A.R.J.B. Bavay, 1913)
Volvarina shlegeli L. Bozzetti, 2017
Granulina signata M. Pin & F. Boyer, 1995
Euryentome silabra (FOSSIL) K.V.W. Palmer, 1937 †
Marginella silicifluvia (FOSSIL) W.H. Dall, 1916 †
Serrata simplex F. Boyer, 2008
Marginella simplicissima (FOSSIL) Martin, 1879 †
Marginella simulata S. Gofas & F. Fernandes,1994
Mesoginella sinapi (C.F. Laseron, 1948)
Marginella singuensis (FOSSIL) E.W. Vredenburg, 1921 †
Marginella singularis S.G. Veldsman, 2016
Eratoidea sinuosa (L. Bozzetti, 1997)
Serrata sinuosa F. Boyer, 2008
Marginella slateri M. Lussi, 2017
Prunum smalli J. Espinosa & J.A. Ortea,2002
Dentimargo smithii (A.E. Verrill, 1885)
Volvarina snyderi J. Espinosa & J.A. Ortea,2012