Tropidophora cincinna (G.B. Sowerby, 1843)
Hendersonina cirrata (B.H. Wrightin L. Pfeiffer, 1867)
Georgia clathratula J.R. Bourguignat, 1882
Otopoma clathratula (C.A. Récluz, 1843)
Otopoma clathratula socotrana H.H. Godwin-Austen, 1881
Rhytidopoma clathratum (A.A. Gould, 1842)
Rhytidopoma clathratum jumaguaense (C. de la Torre& P. Bartsch, 1941)
Opisthosiphon claudens C. de la Torre & P. Bartsch,1941
Chondrothyrella claudicans (F. Poey, 1851)
Ligatella clausa (G.B. Sowerby, 1843;)
Wrightudora clenchi C.G. Aguayo & M.L. Jaume,1954
Kisslingia clenchi (H.A. Pilsbry)
Chondropoma cleti C.G. Aguayo, 1939
Chondropoma cognatum C. de la Torre & P. Bartsch,1938
Opisthosiphon coloni P. Bartsch, 1946
Parachondria columna (W. Wood, 1828)
Tropidophora comburens (J.C. Melvill& J.H. Ponsonby, 1903)
Eutudorops complanata (C. de la Torre& P. Bartsch, 1941)
Chondropometes concolor C. de la Torre & P. Bartsch,1938
Chondropoma confertum (F. Poey, 1852)
Dioscopoma conicum (H.H. Godwin-Austen,1881)
Dioscopoma conicum reticulatum E. Neubert, 2009
Pomatias conicus (FOSSIL) (E. Klein, 1853 †)
Opisthosiphon conicus C.G. Aguayo& M.I. Sánchez Roig, 1949
Cyclotopsis conoidea (L. Pfeiffer, 1847)
Pomatias consobrinus (FOSSIL) (Sandberger, 1872) †
Tropidophora consocia (L. Pfeiffer, 1848)
Tropidophora coquandiana (S.A.A. Petit De La Saussaye, 1852)
Annularops coronadoi (R. Arango in F. Poey,1867)
Rhytidopoma coronatum (F. Poey in L. Pfeiffer,1856)
Chondropomorus coroni P. Bartsch, 1946
Chondrothyra crassa C. de la Torre & P. Bartsch,1938
Wrightudora crassiuscula (C. de la Torre& P. Bartsch, 1941)
Abbottella crataegus Watters, 2016
Chondrothyrium crenimargo (L. Pfeiffer, 1858)