Coptochetus scalaroides (FOSSIL) (J.B.P.A. Lamarck,1803 †)
Euthria scepta K. Fraussen & R. Hadorn,2003
Janiopsis schlumbergeri (FOSSIL) (A.E.M. Cossmann, 1889 †)
Pisania scholvieni H. Rolle, 1892
Egotistica scirrhoma (FOSSIL) J. Marwick, 1934 †
Cominella scirrifer (FOSSIL) C.R. Laws, 1933 †
Plicifusus scissuratus W.H. Dall, 1918
Hesperisternia scissus (FOSSIL) A.A. Olsson, 1964 †
Volutopsius scotiae K. Fraussen, D.W. McKay& J. Drewery, 2013
Bruclarkia seattlensis (FOSSIL) J.W. Durham, 1944 †
Cantharus seguinensis (FOSSIL) Garvie, 2013 †
Pisania semicostata (FOSSIL) R. Tate, 1888 †
Cantharus semiplicatus (FOSSIL) G.P. Deshayes, 1834 †
Burnupena semisulcata (J.B.P.A. Lamarck, 1818)
Engina senae H.A. Pilsbry & H.N. Lowe,1932
Buccinum senshumaruae (S. Kosuge & S. Ishiyama,1971)
Austrofusus separabilis (FOSSIL) P.A. Maxwell, 1992 †
Cantharus septemcostatus G.J. Vermeij & P. Bouchet,1998
Bathydomus setosus (R.B. Watson, 1882)
Latisipho severinus (W.H. Dall, 1919)
Plicifusus sfaxianus F. Nordsieck, 1968
Hesperisternia shaskyi (S.S. Berry, 1959)
Prodotia shepstonensis (J.R. le B. Tomlin, 1926)
Buccinum shiretokoensis T. Habe & K. Itô, 1976
Siphonalia shojii (FOSSIL) K. Hirayama, 1956 †
Engina siderea (L.A. Reeve, 1846)
Buccinum sigmatopleura W.H. Dall, 1907
Siphonalia signa (L.A. Reeve, 1846)
Chlanidota signeyana Powell, 1951
Pollia sillapaytensis (FOSSIL) A.A. Olsson, 1930 †
Prosipho similis K.H.J. Thiele, 1912
Retifusus similis (A.N. Golikov& V.V. Gulbin, 1977)
Monostiolum simonei G.T. Watters, 2016
Buccinum simplex (A.T. von Middendorff,1848)
Mohnia simplex (A.E. Verrill, 1884)