Phalium glaucum (C. Linnaeus, 1758)
Galeodea gradata (FOSSIL) R. Tate, 1888 †
Oocorys grandis A.G. Beu, 2008
Echinophoria grangei (FOSSIL) (J. Marwick, 1926 †)
Semicassis granulata (I. von Born, 1778)
Semicassis granulata cicatricosa (J.F. Gmelin, 1791)
Semicassis granulata loxahatcheensis (FOSSIL) E.J. Petuch, 1994 †
Semicassis granulata peristephes (H.A. Pilsbry& J.T.L. McGinty, 1939)
Semicassis granulata undulata (J.F. Gmelin, 1791)
Semicassis grateloupi (FOSSIL) (G.P. Deshayes, 1850 †)
Semicassis grateloupi cestasensis A.E.M. Cossmann& M.A. Peyrot, 1923
Semicassis grateloupi diadema (J.P.S. Grateloup, 1833)
Semicassis grateloupi varicigera A.E.M. Cossmann& M.A. Peyrot, 1923
Sconsia grayi A. Adams, 1855
Sconsia grayi lindae E.J. Petuch, 1987
Phalium guppyana (FOSSIL) C.J. Maury, 1912 †
Echinophoria hadra (W.P. Woodring& A.A. Olsson, 1957)
Semicassis harpaeformis (FOSSIL) (J.B.P.A. Lamarck,1803 †)
Echinophoria haueri (FOSSIL) (R. Hoernes & M. Auinger,1884 †)
Cassis herklotsi (FOSSIL) Martin, 1879 †
Galeodea hoaraui J. Drivas & M. Jay, 1989
Sconsia hodgii (FOSSIL) (T.A. Conrad, 1841 †)
Echinophoria hupeana (FOSSIL) C. Nielsen, 2003 †
Semicassis incrassata (FOSSIL) (J.P.S. Grateloup,1833 †)
Semicassis inornata (H.A. Pilsbry, 1895)
Semicassis inornata debiae D.R. Goodwin, 2008
Echinophoria intermedia (FOSSIL) (G.B. Brocchi, 1814 †)
Semicassis jauberti (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1923 †
Semicassis kaawaensis (FOSSIL) (Powell & J.A. Bartrum,1928 †)
Casmaria kalosmodix (J.C. Melvill, 1883)
Casmaria kayae J.A. Buijse, H. Dekker& G. Verbinnen, 2013
Cassis ketteri (FOSSIL) J.J. Parodiz & Tripp,1992 †
Galeodea keyteri (R.N. Kilburn, 1975)
Galeodea khaledi (FOSSIL) Abbass, 1967 †
Galeodea koureos (FOSSIL) Gardner, 1939 †