Spirocolpus carsoni (FOSSIL) Finlay & J. Marwick,1937 †
Turritella caseyi (FOSSIL) McNeil, 1984 †
Protoma cathedralis (FOSSIL) (A. Brongniart, 1856 †)
Tropicolpus cavershamensis (FOSSIL) (G.F. Harris, 1897 †)
Turritella ceibana (FOSSIL) Cooke, 1928 †
Turritella cestasensis (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1921 †
Turritella chancellorensis (FOSSIL) (Oleksyshyn, 1959 †)
Zeacolpus chattonensis (FOSSIL) J. Marwick, 1929 †
Sigmesalia chaussyensis (FOSSIL) (A.E.M. Cossmann, 1888 †)
Turritella chicoensis (FOSSIL) W.M. Gabb, 1864 †
Incatella chilensis (FOSSIL) (Sowerby, 1846 †)
Turritella chipolana (FOSSIL) W.H. Dall, 1892 †
Turritella chira (FOSSIL) A.A. Olsson, 1928 †
Turritella chordata H.H. Suter, 1908
Turritella chrysotoxa J.R. le B. Tomlin, 1925
Turritella cingulata G.B. I Sowerby, 1825
Incatella cingulatiformis (FOSSIL) (Möricke, 1896 †)
Turritella cingulifer (FOSSIL) Sowerby, 1825 †
Turritella cingulifera G.B. I Sowerby, 1825
Turritella cingulifera filiola (FOSSIL) M. Yokoyama, 1928 †
Turritella circumdata (FOSSIL) G.P. Deshayes, 1861 †
Colpospira circumligata (J.C. Verco, 1910)
Mesalia claibornensis (FOSSIL) †
Turritella clarionensis L.G. Hertlein & A.M. Strong,1951
Mesalia clarki (FOSSIL) R.E. Dickerson, 1914 †
Turritella clathratula (FOSSIL) Wood, 1847 †
Craginia coalvillensis (FOSSIL) (F.B. Meek †)
Turritella cobbani (FOSSIL) Kirkland, 1996 †
Turritella cochlea L.A. Reeve, 1849
Mesalia cochleata (FOSSIL) (G.B. Brocchi, 1814 †)
Cristispira cochleiformis (FOSSIL) (W.M. Gabb, 1869 †)
Turritella cochlias (FOSSIL) J.F. Bayan, 1873 †
Turritella cochliasthetis (FOSSIL) Orbigny, 1852 †
Turritella cocoditana (FOSSIL) F. Hodson, 1926 †
Turritella coemansi (FOSSIL) Briart & Cornet, 1887 †