Drymaeus spectatus (L.A. Reeve, 1849)
Bostryx spiculatus P.M.A. Morelet, 1860
Bostryx spiculatus paucicostatus A.S.H. Breure, 1978
Bostryx spiculatus pectinatus W.H. Dall, 1912
Naesiotus spirifer W.M. Gabb, 1868
Bulimulus sporadicus (A.V.M.D. D'Orbigny,1835)
Naesiotus steadmani L.A. Chambers, 1986
Scutalus steerei H.A. Pilsbry, 1900
Bostryx stelzneri A. Doering, 1879
Bostryx stelzneri conispirus (A. Doering, 1879)
Bostryx stelzneri hector E.L. Holmberg, 1919
Bostryx stelzneri peristomatus A. Doering, 1879
Naesiotus stenogyroides (R.J.L. Guppy, 1868)
Drymaeus steyermarki (F. Haas, 1955)
Drymaeus stigmaticus R.A. Philippi, 1867
Bulimulus stilbe H.A. Pilsbry, 1901
Mesembrinus stramineus (L. Guilding, 1828)
Bulimus striatulus (FOSSIL) J.B.P.A. Lamarck, 1804 †
Bostryx striatus (P.P. King, 1832)
Drymaeus strigatus (G.B. I Sowerby, 1833)
Drymaeus strigatus saccatus (L. Pfeiffer, 1855)
Bostryx strobeli J.J. Parodíz, 1956
Auris struthiolaris K.T. Menke, 1830
Mesembrinus studeri (L. Pfeiffer, 1847)
Bostryx styliger (H.H. Beck, 1837)
Bostryx subcactorum H.A. Pilsbry, 1896
Naesiotus subcostatus (F. Haas, 1948)
Naesiotus subcostatus chamayensis W.K. Weyrauch, 1967
Drymaeus subeffusus R.A. Philippi, 1869
Bostryx subelatus F. Haas, 1948
Drymaeus subhybridus S.I. Da Costa, 1906
Drymaeus subinterruptus L. Pfeiffer, 1853
Drymaeus subpellucidus (E.A. Smith, 1877)
Drymaeus subsemiclausus (S.A.A. Petit De La Saussaye, 1843)
Drymaeus subsimilaris H.A. Pilsbry, 1898