Classification of Buddington and Chapin 1929

G. †Bellerophon de Montfort 1808
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†Bellerophon sublevis Hall 1856
G. †Straparollus de Montfort 1810
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G. †Bembexia Oehlert and Oehlert 1888
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†Bembexia swallowiana Hall 1856
G. †Phanerotrema Fischer 1885
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†Phanerotrema wortheni Hall 1856
G. †Pleurotomaria Defrance 1826
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†Pleurotomaria conulus Hall 1856
G. †Gastrioceras Hyatt 1884
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G. Macoma Leach 1819
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Macoma sabulosa Spengler 1798
G. †Avonia
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†Avonia porrecta Kutorga 1844
G. †Marginifera Waagen 1884
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†Marginifera aagardi Toula 1875
G. †Pustula
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†Pustula fasciata Kutorga 1844
†Pustula horrida Sowerby 1822
†Pustula humboldti d'Orbigny 1842
†Pustula pustulata Keyserling 1853
†Cryptograptus tricornis Carruthers 1859
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G. †Derbya Waagen 1884
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†Derbya grandis Waagen 1884
G. †Aviculipecten M'Coy 1851
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