Amandana cisternasi muradae (S.H.F. Jaeckel, 1952)
Amandana cisternasi ortizi (L. Gasull, 1964)
Amandana cisternasi scopulicola (A. Bofill& J.B. Aguilar-Amat, 1924)
Helicella cistorum (P.M.A. Morelet, 1845)
Trochulus clandestinus (J.D.W. Hartmann, 1821)
Xerocrassa claudia B. Hausdorf& F.W. Welter-Schultes, 1998
Xerocrassa claudiconus B. Hausdorf& F.W. Welter-Schultes, 1998
Paratheba claussi B. Hausdorf, 2000
Eutheba claustralis (K.T. Menke, 1828)
Trichia claverana (J.R. Bourguignat, 1877)
Metafruticicola coartata A. Fuchs & F. Käufel,1936
Candidula codia (J.R. Bourguignat, 1859)
Trichia coelomphala É.A.A. Locard, 1888
Monacha comata B. Hausdorf, 2000
Caseolus commixtus (R.T. Lowe, 1854)
Ochtephila compar (R.T. Lowe, 1831)
Monacha compingtae (P.M. Pallary, 1929)
Geomitra compressa (FOSSIL) (Münster, 1841 †)
Helicella confusa E. Gittenberger, 1991
Helicopsis conopsis M.T. Aparicio & M. Seddon,1991
Monacha consona (E.A. Rossmässler, 1839)
Caseolus consors (R.T. Lowe, 1831)
Xerotricha conspurcata (J.P.R. Draparnaud, 1801)
Loganiopharynx constrictelabiatus (FOSSIL) (Miller, 1907) †
Xeromagna contermina (L. Pfeiffer, 1848)
Angiomphalia copiosa A.A. Schileyko, 1978
Candidula corbellai A. Martínez-Ortí, 2011
Xerotricha corderoi (E. Gittenberger& M.Y. Manga, 1977)
Leucozonella corona A.A. Schileyko& T.S. Rymzhanov, 2010
Geomitra coronata (G.P. Deshayes, 1819)
Geomitra coronula (R.T. Lowe, 1852)
Cyrnotheba corsica (R.J. Shuttleworth, 1843)
Semifruticicola costulata (K. Brancsik, 1897)
Semifruticicola costulata serbica A.J. Wagner, 1914
Pyrenaearia cotiellae (P. Fagot, 1906)