Arianta schmidti E.A. Rossmässler, 1836
Isaurica schuetti P. Subai, 1994
Helix secernenda E.A. Rossmässler, 1837
Tingitana seguyana (J. Péchaud, 1883)
Hemicycla semitecta A. Mousson, 1872
Marmorana serpentina (A.E.J. Férussac, 1801)
Frechenia serresi (FOSSIL) H. Nordsieck, 2017 †
Liburnica setigera (E.A. Rossmässler, 1836)
Campylaea setosa (E.A. Rossmässler, 1836)
Helicigona setosa (A.E.J. Férussac, 1832)
Tingitana shioum (P.M. Pallary, 1910)
Rossmaessleria sicanoides (W. Kobelt, 1881)
Rossmaessleria sicanoides albina (W. Kobelt, 1881)
Rossmaessleria sicanoides polita (W. Kobelt, 1881)
Rossmaessleria sicanoides unifasciata (W. Kobelt, 1881)
Ambigua signata (A.E.J. Férussac, 1821)
Ambigua signata molteni Unknown
Agalactochilus silesiacus (FOSSIL) (Andreae, 1902) †
Megalotachea silvana (FOSSIL) (E. Klein, 1853 †)
Cepaea silvatica (J.P.R. Draparnaud, 1801)
Superba skipetarica (P. Subai, 1995)
Superba skipetarica asketa (P. Subai, 1995)
Alabastrina skouraensis (P.M. Pallary, 1933)
Eremina smaraensis J. Ahuir Galindo, 2015
Helix sobrina A.E.J. Férussac, 1821
Helix solidus R.T. Lowe, 1831
Theba solimae C.F. Sacchi, 1955
Alabastrina soluta (A. Michaud, 1833)
Alabastrina soluta minor (P.M. Pallary)
Alabastrina soluta rufa (P.M. Pallary, 1926)
Helix sonensis (FOSSIL) M.A. Peyrot, 1932 †
Chilostoma sphaeriostoma J.R. Bourguignat, 1857
Chilostoma sphaeriostoma hymettii W. Kobelt, 1876
Otala sphaeromorpha J.R. Bourguignat, 1883
Levantina spiriplana (G.A. Olivier, 1801)