Glyptozaria columnaria B.C. Cotton & N.H. Woods,1935 Australia, Capricorn Channel
Turritella columnaris L.C. Kiener, 1844 Arab Emirates65,4 mm
Turritella communis A. Risso, 1826 Spain, Almeria32 mm
Turritella comptus (FOSSIL) G.P. Deshayes, 1861 † France, Paris Basin
Mesalia concava (FOSSIL) Abbass, 1967 † Egypt, Suhaj, Sawhaj
Turritella congelata A. Adams & L.A. Reeve,1849 Philippines, Camotes Islands10,4 mm
Vermicularia conica (FOSSIL) J.B.P.A. Lamarck, 1804 † Ukraine
Turritella conofaciata (FOSSIL) F. Sacco, 1895 † Greece, Epirus and Western Macedonia
Turritella conoidea (FOSSIL) Sowerby, 1814 † UK, England, Hampshire
Turritella conquistadorana (FOSSIL) G.D. Hanna & Israelsky,1925 † Peru, Payta
Sigmesalia consobrina (FOSSIL) (G.P. Deshayes, 1861 †) France, Paris Basin
Turritella conspera Adams & L.A. Reeve, 1850
Turritella conspersa A. Adams & L.A. Reeve,1849 Senegal, Dakar50 mm
Colpospira conspicabilis (FOSSIL) (R. Tate, 1893 †) Australia, Victoria
Vermicularia contorta (FOSSIL) Blake † UK, Cambridgeshire
Turritella contracta (FOSSIL) Sowerby, 1850 † France, Paris Basin
Turritella cookei W.C. Mansfield, 1930 Florida, Leon County
Turritella cooperi Carpenter, 1864 Mexico, Baja California
Colpospira cordismei (Watson, 1881) Australia, Eden22 mm
Turritella coreanica (T. Kotaka, 1951) Senegal, Dakar
Turritella cornea J.B.P.A. Lamarck, 1822
Turritella coursisi I. Marche-Marchad, 1959 Senegal, Dakar
Turritella couteaudi J.F. Mabille& A. de Rochebrune, 1889
Mariacolpus covepointensis (FOSSIL) E.J. Petuch, 2004 † Maryland, St. Marys County33 mm
Turritella cramatensis (FOSSIL) Martin, 1905 †
Turritella crenulata (FOSSIL) P. Nyst, 1844 †
Turritella crocea L.C. Kiener, 1843
Turritella cruzadoi (FOSSIL) DeVries, 2007 † Peru, Ica, Pisco
Eligmostoma culsensis (FOSSIL) A.E.M. Cossmann, 1888 †
Turritella cumberlandia (FOSSIL) T.A. Conrad, 1863 † USA, Delaware
Turritella curamichatensis (FOSSIL) F. Hodson, 1926 † Colombia, La Guajira, Uribia
Colpospira curialis C. Hedley, 1907 Australia, Sydney10 mm
Turritella dalli (FOSSIL) Gardner, 1947 † Florida
Turritella darwini (FOSSIL) R.A. Philippi, 1887 † Chile, Navidad Formation21 mm
Turritella daviesi (FOSSIL) Cox, 1930 † Pakistan, N.W.F.P., Kohat