Trichia sericea (J.P.R. Draparnaud, 1801)
Xerocrassa serrulata (H.H. Beck, 1837)
Candidula setubalensis (L. Pfeiffer, 1850)
Helicomela setulosa (R.T. Lowe, 1831)
Xerocrassa siderensis (H. von Maltzan, 1883)
Xerotricha silosensis A. Ortiz De Zárate, 1950
Leptaxis simia (A.E.J. Férussac, 1832)
Xerocrassa simulata (C.G. Ehrenberg, 1831)
Xerocrassa simulata lothari H.K. Mienis
Trochoidea siniaca (E.C. Von Martens)
Xerocrassa siphnica (W. Kobelt, 1883)
Candidula sipylensis J. Germain, 1933
Xerocrassa sitiensis (H. von Maltzan, 1887)
Xeropicta smyrnocretica (J. Germain, 1933)
Helicella snassensis (P.M. Pallary, 1918)
Hesseola solidior (A. Mousson, 1863)
Monacha solitudinis (J.R. Bourguignat, 1852)
Xeroleuca souirensis (P.M. Pallary, 1921)
Candidula spadae (P. Calcara, 1845)
Caseolus sphaerulus (R.T. Lowe, 1852)
Monacha spiroxia (J.R. Bourguignat, 1868)
Ochtephila spirulina (T.D.A. Cockerell, 1921)
Helicella spiruloides A.J. Wagner, 1916
Trochoidea spratti L. Pfeiffer, 1846
Trochoidea spratti calcarata L. Benoit, 1860
Trochoidea spratti macrostoma E.C. Von Martens, 1873
Trochoidea spratti ogygiaca C.A. Westerlund, 1889
Trochoidea spratti perplanata H.A. Pilsbry, 1893
Spirorbula squalida R.T. Lowe, 1852
Abchasohela stephaniae (V. Hüdec & G.I. Lezhawa,1970)
Helicella stiparum (E.A. Rossmässler, 1854)
Monacha stipulifera B. Hausdorf, 2000
Helicopsis striata (O.F. Müller, 1774)
Helicopsis striata austriaca E. Gittenberger, 1969
Helicopsis striata hungarica (L. Soós & H. Wagner,1935)