Glypteuthria capensis K.H.J. Thiele, 1925
Afrocominella capensis (R.W. Dunkerin R.A. Philippi, 1844)
Afrocominella capensis simoniana (S.A.A. Petit De La Saussaye, 1852)
Solenosteira capitanea S.S. Berry, 1957
Anna capixaba J. Coltro& A.P.S. Dornellas, 2013
Engina caribbaea P. Bartsch & H.A. Rehder,1939
Pararetifusus carinatus (W.F. Ponder, 1970)
Cantharus carinifera H.C. Küster
Searlesia carlsoni (FOSSIL) F.M. Anderson & B. Martin,1914 †
Engina carolinae L.C. Kiener, 1840
Retimohnia carolinensis (A.E. Verrill, 1884)
Siphonalia cassidariaeformis (L.A. Reeve, 1846)
Siphonalia cassidariaeformis conspersa A. Adams, 1863
Siphonalia cassidariaeformis funerea H.A. Pilsbry, 1895
Siphonalia cassidariaeformis ornata A. Adams, 1863
Siphonalia cassidariaeformis tosana (S. Hirase, 1908)
Prodotia castanea (J.C. Melvill, 1912)
Buccinum castaneum W.H. Dall, 1877
Volutopsius castaneus (O.A.L. Mörch, 1857)
Aeneator castillai J.H. McLean & B.G. Andrade,1982
Burnupena catarrhacta (J.F. Gmelin, 1791)
Burnupena catarrhacta dunkeri (H.C. Küster, 1858)
Muffinbuccinum catherinae M.G. Harasewych& Y.I. Kantor, 2004
Buccinulum caudatum (FOSSIL) A.W.B. Powell, 1929 †
Euthria cecilea K. Fraussen & E. Rolán,2003
Cantharus cecillei R.A. Philippi, 1844
Euthria ceddensis (FOSSIL) Brunetti & Della Bella,2016 †
Buccinum centrosum (FOSSIL) Cope, 1867 †
Pareuthria cerealis (A. de Rochebrune& J.F. Mabille, 1885)
Prosipho certus K.H.J. Thiele, 1912
Euthria cesari A. Monteiro & E. Rolán,2005
Parviphos chalcedonius G.T. Watters, 2009
Buccinum chartium W.H. Dall, 1919
Austrofusus chathamensis H.J. Finlay, 1928
Penion chathamensis (A.W.B. Powell, 1938)