Classification of Carpenter 1866

G. Bittium Gray 1847
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Bittium armillatum Carpenter 1864
†Bittium asperum Gabb 1861
G. Opalia Adams and Adams 1853
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†Opalia insculpta Carpenter 1866
G. Turritella Lamarck 1799 [turret shell]
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†Turritella jewettii Carpenter 1866
G. Trophon Montfort 1810
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†Trophon tenuisculptus Carpenter 1866