Classification of Clarke 1908
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. †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. †Diaphorostoma Fischer 1885
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†Diaphorostoma desmatum Clarke 1904
†Diaphorostoma perceense Clarke 1908
†Diaphorostoma ventricosum Conrad 1842
G. †Tropidocyclus de Koninck 1882
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†Tropidocyclus brevilineatus Conrad 1842
†Tropidocyclus rotalinea Hall 1879
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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†Platyceras (Orthonychia) belli Clarke 1908
Subg. †Bellerophon (Plectonotus) Clarke 1899
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†Bellerophon (Plectonotus) gaspensis Clarke 1908
G. †Orthothetes
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Subg. †Orthothetes (Schuchertella) Girty 1904
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†Orthothetes (Schuchertella) becraftensis Clarke 1900
†Orthothetes (Schuchertella) woolworthanus Hall 1857