Classification of Billings 1866
G. †Cyrtolites Conrad 1838
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†Cyrtolites desiderata Billings 1866
†Cyrtolites pannosus Billings 1866
G. †Ischyrinia Billings 1866
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†Ischyrinia plicata Billings 1866
†Ischyrinia winchelli Billings 1866
G. †Bellerophon de Montfort 1808
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†Bellerophon bilobatus de Sowerby and Murchison 1839
†Bellerophon canadensis Billings 1866
†Bellerophon fraternus Billings 1866
†Bellerophon solitarius Billings 1866
G. †Cyclonema Hall 1852
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†Cyclonema bellula Billings 1866
†Cyclonema communis Billings 1866
†Cyclonema decora Billings 1866
†Cyclonema humilis Billings 1866
†Cyclonema mediocris Billings 1866
†Cyclonema percingulatum Billings 1857
†Cyclonema thalia Billings 1857
G. †Murchisonia d'Archiac and de Verneuil 1841
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†Murchisonia funata Billings 1866
†Murchisonia modesta Billings 1857
†Murchisonia multivolvis Billings 1857
†Murchisonia papillosa Billings 1857
†Murchisonia rugosum Billings 1857
†Murchisonia teretiformis Billings 1857
†Murchisonia turricula Billings 1857
†Murchisonia varians Billings 1857
G. †Pleurotomaria Defrance 1826
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†Pleurotomaria circe Billings 1857
†Pleurotomaria cryptata Billings 1866
†Pleurotomaria sybellina Billings 1866
G. †Subulites Emmons 1842
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†Subulites notatus Billings 1866
†Subulites richardsoni Billings 1857
G. †Orthoceras Breynius 1832
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†Orthoceras anticostiense Billings 1857
†Orthoceras bellatulum Billings 1866
†Orthoceras infelix Billings 1866
†Orthoceras raptor Billings 1866
G. †Cyrtodonta Billings 1858
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†Cyrtodonta emma Billings 1862
†Cyrtodonta plebia Billings 1866
G. †Ptilodictya Lonsdale 1839
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†Ptilodictya canadensis Billings 1866
†Ptilodictya fragilis Billings 1866
†Ptilodictya nitidula Billings 1866
G. †Rhynchonella Fischer 1809
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†Rhynchonella janea Billings 1866
†Rhynchonella vicina Billings 1866
†Orthoceras fulgar Billings 1866
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Invalid names: Orthoceras propinquum Billings 1857 [replaced]