Tropidophora cincinna (G.B. Sowerby, 1843) Madagascar, Fort Dauphin12 mm
Hendersonina cirrata (B.H. Wright in L. Pfeiffer, 1867) Cuba
Georgia clathratula J.R. Bourguignat, 1882 Yemen28,8 mm
Otopoma clathratula (C.A. Récluz, 1843) Yemen, Socotra Island15,8 mm
Otopoma clathratula socotrana H.H. Godwin-Austen, 1881 Yemen, Socotra Island25 mm
Rhytidopoma clathratum (A.A. Gould, 1842) Cuba
Rhytidopoma clathratum jumaguaense (C. de la Torre& P. Bartsch, 1941) Cuba8 mm
Opisthosiphon claudens C. de la Torre& P. Bartsch, 1941 Cuba
Chondrothyrella claudicans (F. Poey, 1851) Cuba14 mm
Ligatella clausa (G.B. Sowerby, 1843;) Yemen
Wrightudora clenchi C.G. Aguayo & M.L. Jaume,1954 Cuba
Kisslingia clenchi (H.A. Pilsbry) Dominican Republic
Chondropoma cleti C.G. Aguayo, 1939 Cuba
Chondropoma cognatum C. de la Torre& P. Bartsch, 1938 Cuba
Opisthosiphon coloni P. Bartsch, 1946 Bahamas8 mm
Parachondria columna (W. Wood, 1828) Jamaica
Tropidophora comburens (J.C. Melvill& J.H. Ponsonby, 1903) South Africa, Zululand
Eutudorops complanata (C. de la Torre& P. Bartsch, 1941) Cuba
Chondropometes concolor C. de la Torre& P. Bartsch, 1938 Cuba17,3 mm
Chondropoma confertum (F. Poey, 1852) Cuba
Dioscopoma conicum (H.H. Godwin-Austen,1881) Yemen, Socotra11,4 mm
Dioscopoma conicum reticulatum E. Neubert, 2009 Yemen, Socotra
Pomatias conicus (FOSSIL) (E. Klein, 1853 †)
Opisthosiphon conicus C.G. Aguayo& M.I. Sánchez Roig, 1949 Cuba
Cyclotopsis conoidea (L. Pfeiffer, 1847) Mauritius7,25 mm
Pomatias consobrinus (FOSSIL) (Sandberger, 1872) †
Tropidophora consocia (L. Pfeiffer, 1848) Madagascar, Diego Suarez17 mm
Tropidophora coquandiana (S.A.A. Petit De La Saussaye, 1852) Madagascar, Fort Dauphin30 mm
Annularops coronadoi (R. Arango in F. Poey,1867) Cuba
Rhytidopoma coronatum (F. Poey in L. Pfeiffer,1856) Cuba8 mm
Chondropomorus coroni P. Bartsch, 1946 Dominican Republic12,1 mm
Chondrothyra crassa C. de la Torre& P. Bartsch, 1938 Cuba25 mm
Wrightudora crassiuscula (C. de la Torre& P. Bartsch, 1941) Cuba
Abbottella crataegus Watters, 2016
Chondrothyrium crenimargo (L. Pfeiffer, 1858) Cuba