Classification of Clarke 1908

G. †Conocardium Bronn 1835
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Conocardium cuneus Conrad 1840
G. †Bellerophon de Montfort 1808
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Bellerophon plenus Billings 1874
G. †Holopea Hall 1847
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Holopea antiqua Vanuxem 1842
Holopea gaspesia Clarke 1908
Holopea wakehami Clarke 1908
G. †Eotomaria Ulrich and Scofield 1897
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Eotomaria delia Billings 1874
Eotomaria lydia Billings 1874
Eotomaria rotula Clarke 1908
Eotomaria voltumna Billings 1874
G. †Lophospira Whitfield 1886
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Lophospira bilirata Hall 1860
G. †Platyceras Conrad 1840
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Platyceras fornicatum Hall 1862
Platyceras gaspense Clarke 1908
Platyceras guesnini Clarke 1908
Platyceras leboutillieri Clarke 1907
Platyceras lejeunii Clarke 1908
Platyceras nodosum Conrad 1841
Platyceras paxiller Clarke 1908
Platyceras tortuosum Hall 1859
G. †Pleurotomaria Defrance 1826
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Pleurotomaria labrosa Hall 1859
G. †Trochonema Salter 1859
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Trochonema lescarboti Clarke 1908
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G. †Diaphorostoma Fischer 1885
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Diaphorostoma desmatum Clarke 1904
Diaphorostoma perceense Clarke 1908
G. †Tropidocyclus de Koninck 1882
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G. †Callonema Hall 1879
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Callonema bellatulum Hall 1861
G. †Euphemus M'Coy 1844
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Euphemus quebecensis Clarke 1908
G. †Coelidium Clarke and Ruedemann 1903
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Coelidium egregium Billings 1874
Coelidium hebe Billings 1874
Subg. †Platyceras (Orthonychia) Hall 1843
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G. †Stropheodonta Hall 1852
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Subg. †Bellerophon (Plectonotus) Clarke 1899
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