The genus Cassis includes  extant and extinct species:
Cassis abbotti Bouchet, 1988
† Cassis altispira  Beu 2010
† Cassis birmanica  Vredenburg 1921
† Cassis brasili (Cossmann & Pissarro, 1905)
† Cassis calusa Petuch and Berschauer 2018
Cassis cornuta (Linnaeus, 1758)
† Cassis costulifera  Beu 2010
† Cassis delta  Parker 1948
† Cassis depressior  Martin 1879
Cassis fimbriata Quoy & Gaimard, 1833
Cassis flammea (Linnaeus, 1758)
† Cassis flintensis  Mansfield 1940
† Cassis floridensis  Tucker and Wilson 1932
† Cassis glaucoides  Martin 1879
† Cassis herklotsi  Martin 1879
† Cassis ketteri  Parodiz and Tripp 1992
Cassis kreipli Morrison, 2003
† Cassis lelongi Gain, Belliard & Le Renard, 2017
† Cassis maccormacki  Olsson 1928
Cassis madagascariensis Lamarck, 1822
† Cassis mammillaris  Grateloup 1927
Cassis nana Tenison-Woods, 1879
† Cassis nigellensis Gain, Belliard & Le Renard, 2017
Cassis norai Prati Musetti, 1995
Cassis nummulitiphila  Sacco 1890
† Cassis parfouruorum Gain, Belliard & Le Renard, 2017
Cassis patamakanthini Parth, 2000
† Cassis powelli Petuch and Berschauer, 2018
Cassis retusa  Michelotti 1861
Cassis subtuberosa  Hanna 1926
Cassis sulcifera  Sowerby 1850
Cassis tessellata Gmelin, 1791
Cassis togata  White 1887
Cassis tuberosa (Linnaeus, 1758)
Cassis vialensis  Fuchs 1870
Fossils of the sea snails within this genus have been found all over the world in sediments from Paleocene to Recent (age range: 66 to 0 million years ago).

Species brought into synonymy
Cassis achatina Lamarck, 1816: synonym of Semicassis labiata (Perry, 1811)
Cassis areola (Linnaeus, 1758): synonym of Phalium areola (Linnaeus, 1758)
Cassis bituberculosa Martens, 1901: synonym of Echinophoria bituberculosa (Martens, 1901)
Cassis callosa Röding, 1798: synonym of Nassarius gibbulosus (Linnaeus, 1758)
Cassis centiquadrata (Valenciennes, 1832): synonym of Semicassis centiquadrata (Valenciennes, 1832)
Cassis cernica Sowerby III, 1888: synonym of Casmaria ponderosa ponderosa (Link, 1807)
Cassis coarctata G.B. Sowerby I, 1825: synonym of Cypraecassis coarctata (G.B. Sowerby I, 1825)
Cassis coronadoi Crosse, 1867: synonym of Echinophoria coronadoi (Crosse, 1867)
Cassis dalli Anderson, 1929: synonym of Echinophoria hadra (Woodring & Olsson, 1957)
Cassis glans Röding, 1798: synonym of Demoulia abbreviata (Gmelin, 1791)
Cassis glauca (Linnaeus, 1758): synonym of Phalium glaucum (Linnaeus, 1758)
Cassis globulus Menke, 1829: synonym of Demoulia ventricosa (Lamarck, 1816)
Cassis gracilenta Yokoyama, 1928: synonym of Cyllene gracilenta (Yokoyama, 1928)
Cassis japonica Reeve, 1848: synonym of Semicassis bisulcata (Schubert & Wagner, 1829)
Cassis labrosa Martini, 1773: synonym of Malea pomum (Linnaeus, 1758)
Cassis ringens Swainson, 1822: synonym of Malea ringens (Swainson, 1822)
Cassis rufa (Linnaeus, 1758): synonym of Cypraecassis rufa (Linnaeus, 1758)
Cassis spinosa (Gronovius, 1781): synonym of Cassis tessellata Gmelin, 1791
Cassis tenuis Wood, 1828: synonym of Cypraecassis tenuis (Wood, 1828)
Cassis vibex (Linnaeus, 1758): synonym of Casmaria erinaceus (Linnaeus, 1758)
Cassis wyvillei Watson, 1886: synonym of Echinophoria wyvillei (Watson, 1886)
The genus Cassis includes  extant and extinct species:
Cassis abbotti Bouchet, 1988
† Cassis altispira  Beu 2010
† Cassis birmanica  Vredenburg 1921
† Cassis brasili (Cossmann & Pissarro, 1905)
† Cassis calusa Petuch and Berschauer 2018
Cassis cornuta (Linnaeus, 1758)
† Cassis costulifera  Beu 2010
† Cassis delta  Parker 1948
† Cassis depressior  Martin 1879
Cassis fimbriata Quoy & Gaimard, 1833
Cassis flammea (Linnaeus, 1758)
† Cassis flintensis  Mansfield 1940
† Cassis floridensis  Tucker and Wilson 1932
† Cassis glaucoides  Martin 1879
† Cassis herklotsi  Martin 1879
† Cassis ketteri  Parodiz and Tripp 1992
Cassis kreipli Morrison, 2003
† Cassis lelongi Gain, Belliard & Le Renard, 2017
† Cassis maccormacki  Olsson 1928
Cassis madagascariensis Lamarck, 1822
† Cassis mammillaris  Grateloup 1927
Cassis nana Tenison-Woods, 1879
† Cassis nigellensis Gain, Belliard & Le Renard, 2017
Cassis norai Prati Musetti, 1995
Cassis nummulitiphila  Sacco 1890
† Cassis parfouruorum Gain, Belliard & Le Renard, 2017
Cassis patamakanthini Parth, 2000
† Cassis powelli Petuch and Berschauer, 2018
Cassis retusa  Michelotti 1861
Cassis subtuberosa  Hanna 1926
Cassis sulcifera  Sowerby 1850
Cassis tessellata Gmelin, 1791
Cassis togata  White 1887
Cassis tuberosa (Linnaeus, 1758)
Cassis vialensis  Fuchs 1870
Fossils of the sea snails within this genus have been found all over the world in sediments from Paleocene to Recent (age range: 66 to 0 million years ago).
Species brought into synonymy
Cassis achatina Lamarck, 1816: synonym of Semicassis labiata (Perry, 1811)
Cassis areola (Linnaeus, 1758): synonym of Phalium areola (Linnaeus, 1758)
Cassis bituberculosa Martens, 1901: synonym of Echinophoria bituberculosa (Martens, 1901)
Cassis callosa Röding, 1798: synonym of Nassarius gibbulosus (Linnaeus, 1758)
Cassis centiquadrata (Valenciennes, 1832): synonym of Semicassis centiquadrata (Valenciennes, 1832)
Cassis cernica Sowerby III, 1888: synonym of Casmaria ponderosa ponderosa (Link, 1807)
Cassis coarctata G.B. Sowerby I, 1825: synonym of Cypraecassis coarctata (G.B. Sowerby I, 1825)
Cassis coronadoi Crosse, 1867: synonym of Echinophoria coronadoi (Crosse, 1867)
Cassis dalli Anderson, 1929: synonym of Echinophoria hadra (Woodring & Olsson, 1957)
Cassis glans Röding, 1798: synonym of Demoulia abbreviata (Gmelin, 1791)
Cassis glauca (Linnaeus, 1758): synonym of Phalium glaucum (Linnaeus, 1758)
Cassis globulus Menke, 1829: synonym of Demoulia ventricosa (Lamarck, 1816)
Cassis gracilenta Yokoyama, 1928: synonym of Cyllene gracilenta (Yokoyama, 1928)
Cassis japonica Reeve, 1848: synonym of Semicassis bisulcata (Schubert & Wagner, 1829)
Cassis labrosa Martini, 1773: synonym of Malea pomum (Linnaeus, 1758)
Cassis ringens Swainson, 1822: synonym of Malea ringens (Swainson, 1822)
Cassis rufa (Linnaeus, 1758): synonym of Cypraecassis rufa (Linnaeus, 1758)
Cassis spinosa (Gronovius, 1781): synonym of Cassis tessellata Gmelin, 1791
Cassis tenuis Wood, 1828: synonym of Cypraecassis tenuis (Wood, 1828)
Cassis vibex (Linnaeus, 1758): synonym of Casmaria erinaceus (Linnaeus, 1758)
Cassis wyvillei Watson, 1886: synonym of Echinophoria wyvillei (Watson, 1886)
Cassis (gastropod)