Phasianotrochus sericinus (K.H.J. Thiele, 1930)
Gibbula serpa F. Nordsieck, 1982 Baleares
Prothalotia serpentina (J.R.C. Quoy& J.P. Gaimard, 1859)
Jujubinus sexangularis (FOSSIL) (C.L.F. von Sandberger, 1859 †) Germany, Rheinland-Pfalz10 mm
Clanculus simoni G.T. Poppe, S.P. Tagaro& H. Dekker, 2006 Philippines, Aliguay Island11 mm
Charisma simplex (C.F. Laseron, 1954) New South Wales, Australia
Monilea simulans E.A. Smith, 1899
Oxystele sinensis (J.F. Gmelin, 1791) South Africa50,4 mm
Trochus smaragdus L.A. Reeve, 1861 Philippines
Monilea smithi (W. Wood, 1828) Japan, Oita16,3 mm
Monilea solanderi (R.A. Philippi, 1851)
Gibbula solarium (FOSSIL) (P. Nyst, 1835 †) Belgium
Praecia sondeianus (FOSSIL) Martin, 1905 † Indonesia, Jawa Tengah, Wonosobo
Clelandella sovisi (FOSSIL) M. Harzhauser, 2014 † India
Clanculus spadiceus (R.A. Philippi, 1848) Gabon, Sao Tomé Island15 mm
Antisolarium spectandrum (FOSSIL) C.R. Laws, 1950 †
Pseudominolia splendens (G.B. III Sowerby, 1897) South Africa, Durban11 mm
Stomatia splendidula A. Adams, 1855 Australia, Newcastle
Gibbula spratti (E. Forbes, 1844) Turkey, Bozcaada Island6 mm
Gibbula spratti nanodea F. Nordsieck, 1982 Turkey, Bozcaada Island5 mm
Gibbula spurca (A.A. Gould, 1856) Canary Islands, Tenerife14,4 mm
Trochus squamosior (FOSSIL) Hudleston † UK, Lincolnshire
Trochus squarrosus J.B.P.A. Lamarck, 1822 Vietnam23 mm
Sericominolia stearnsii (H.A. Pilsbry, 1895) Philippines, Mactan Island8,1 mm
Trochus stefaninii (FOSSIL) S. Nardini, 1934 † Eritrea, Debubawi Keyih Bahri, Dahlak
Agagus stellamaris D.G. Herbert, 1991
Stomatella stellata (S.M. Souverbie& R.P. Montrouzier, 1863) Fiji Islands
Trochus stellatus J.F. Gmelin, 1791 Philippines, Cebu51 mm
Clanculus stigmatarius A. Adams, 1853 New Caledonia, Noumea11 mm
Antisolarium stoliczkai (FOSSIL) (C.A. von Zittel, 1865 †)
Gibbula stoliczkana (G. Nevill & H. Nevill,1869) Singapore4 mm
Eurytrochus strangei (A. Adams, 1853) Australia, Port Jackson
Stomatella striatula (A. Adams, 1850)
Trochus striatula A. Garrett, 1857 Hawaii
Jujubinus striatus (C. Linnaeus, 1758) Italy, Cannizzaro6 mm