Epitonium coretum (T. Iredale, 1936)
Epitonium corniculum Lee & Y.F. Huang, 2016
Opalia corolla (J.C. Melvill & R. Standen,1903)
Cirsotrema coronale (FOSSIL) (G.P. Deshayes, 1861 †)
Gyroscala coronata (J.B.P.A. Lamarck, 1816)
Opalia coronata (R.A. Philippi, 1844)
Punctiscala costigera (K.H.J. Thiele, 1925)
Surrepifungium costulatum (L.C. Kiener, 1839)
Epitonium coutieri (F.P. Jousseaume, 1912)
Epitonium couturieri (M.E.A. de Boury, 1912)
Cirsotrema crassicostatum (FOSSIL) (G.P. Deshayes, 1839 †)
Epitonium crassicostatum E. Gittenberger& A. Gittenberger, 2005
Opalia crassilabrum (G.B. II Sowerby, 1844)
Epitonium crassum (G.B. II Sowerby, 1847)
Epitonium creberrimum (R.B. Hinds, 1843)
Epitonium crebricostatum P.P. Carpenter, 1864
Crebriscala crebricostellata (FOSSIL) (Mayer-Eymar, 1900 †)
Opalia crenata (C. Linnaeus, 1758)
Opalia crenatoides P.P. Carpenter, 1864
Cycloscala crenulata (W.H. Pease, 1867)
Cirsotrema cribaria A. Adams, 1861
Cirsotrema cribrarium A. Adams, 1861
Epitonium crispatum (W.H. Pease, 1863)
Epitonium crispum (FOSSIL) (J.B.P.A. Lamarck,1804 †)
Gregorioiscala crosnieri E.F. Garcia, 2004
Epitonium crypticorona R.N. Kilburn, 1985
Opalia crystallina (P.P. Carpenter, 1864)
Cirsotrema ctenodentatum Zelaya & Güller, 2017
Amaea cuisensis (FOSSIL) M.E.A. de Boury, 1887 †
Acirsa culmosa (FOSSIL) N.F. Sohl, 1964 †
Epitonium cultellicostum (M.E.A. de Boury, 1913)
Epitonium cumingii (P.P. Carpenter, 1856)
Acrilla curta (FOSSIL) A. von Koenen, 1891 †
Epitonium curvilineatum (G.B. II Sowerby, 1844)
Turriscala cylindrella (FOSSIL) (H.H. Suter, 1917 †)