Macrocallista snatolensis (FOSSIL) Krishtofovich, 1947 †
Globivenus snellii (E. Fischer-Piette, 1975)
Callista sobrina (FOSSIL) (T.A. Conrad, 1848 †)
Raina sodalis (FOSSIL) J. Marwick, 1929 †
Pitar sokolowi (FOSSIL) (Slodkewitsch †)
Sunetta solanderii (J.E. Gray, 1825)
Egesta solida (W.H. Dall, 1902)
Dosinia solida (FOSSIL) É.A. Benoist, 1873 †
Pitar soligena (A. Römer, 1867)
Antigona somwangi M. Huber, 2010
Pitar sophiae (G.F. Angas, 1877)
Pitar sorachiensis (FOSSIL) K. Oyama & A. Mizuno,1958 †
Periglypta soror (FOSSIL) (G.P. Deshayes, 1857 †)
Bassina southlandica C.A. Fleming, 1962
Lioconcha sowerbyi (G.P. Deshayes, 1853)
Antigona sowerbyi (G.P. Deshayes, 1853)
Laevicirce soyoae T. Habe, 1951
Chamelea spada (FOSSIL) W.H. Dall, 1903 †
Trigonocallista spathi (FOSSIL) Rennie 1930 †
Gafrarium speciosum (A. Römer, 1869)
Bassina speighti (FOSSIL) (H.H. Suter, 1913 †)
Tawera sphaericula (G.P. Deshayes, 1853)
Pelecyora sphaericula (A. Römer, 1862)
Tivelina sphenarium (FOSSIL) (J.F. Bayan, 1873 †)
Chionopsis spiekeri (FOSSIL) A.A. Olsson, 1932 †
Tawera spissa (G.P. Deshayes, 1835)
Callista splendida Mérian, 1860
Hyphantosoma spoori (K.L. Lamprell& T. Whitehead, 1990)
Chione springvalensis (FOSSIL) E.H. Vokes, 1938 †
Callista spuma (P.F. Röding, 1798)
Megapitaria squalida (G.B. I Sowerby, 1835)
Megapitaria squalida biradiata (J.E. Gray, 1838)
Megapitaria squalida chionacea (K.T. Menke, 1847)
Anomalodiscus squamosa (C. Linnaeus, 1758)
Chioneryx squamosa (Carpenter, 1857)