Clithon chlorostomum (G.B. I Sowerby, 1833)
Clithon chlorostomum dispar (W.J. Broderip, 1832)
Neripteron christovalensis L.A. Reeve
Neritina chrysocolla (A.A. Gould, 1848)
Nerita chrysostoma C.A. Récluz, 1841
Neritina cinctella (E.C. Von Martens, 1874)
Nerita circumvallata (FOSSIL) J.F. Bayan, 1870 †
Clithon circumvoluta (C.A. Récluz, 1843)
Neritina clenchi H.D. Russell, 1940
Septaria clypeolum (C.A. Récluz, 1842)
Theodoxus colchicus (FOSSIL) (N.I. Andrusov, 1912 †)
Neritina communis (J.R.C. Quoy& J.P. Gaimard, 1832)
Nerita compacta E. Forbes, 1846
Cryptonerita conoidea (FOSSIL) Böhm, 1895 †
Vitta consobrina Eichhorst, 2016
Theodoxus constantiae (FOSSIL) Stefanescu, 1896 †
Neritodryas cornea (C. Linnaeus, 1758)
Otostoma corneti (FOSSIL) Vincent, 1930 †
Neritina cornucopia (W.H. Benson, 1836)
Neritina cornuta L.A. Reeve, 1855
Vittina coromandeliana (G.B. II Sowerby, 1832)
Clithon corona (C. Linnaeus, 1758)
Theodoxus coronatus (W.E. Leach, 1815)
Ritena costata (J.F. Gmelin, 1791)
Nerita costulata G. von dem Buschin R.A. Philippi, 1844
Nerita crassa A.A. Gould, 1852
Theodoxus crenulatus (FOSSIL) (E. Klein, 1853 †)
Theodoxus crenulatus bessarabica (FOSSIL) (Sinzow, 1899 †)
Theodoxus crescens (FOSSIL) (A. Fuchs, 1870 †)
Nereina cresswelli T.C. Eichhorst, 2016
Schwardtina cretacea (FOSSIL) (L. von G. Tausch,1886 †)
Vitta cristata P.M.A. Morelet, 1864
Clithon cryptum T.C. Eichhorst, 2016
Theodoxus culceri (FOSSIL) (Porumbaru, 1881 †)
Vittina cumingiana (C.A. Récluz, 1842)