Classification of Billings 1860
G. †Bellerophon de Montfort 1808
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†Bellerophon argo Billings 1860
†Bellerophon charon Billings 1860
†Bellerophon disculus Billings 1860
G. †Straparollus de Montfort 1810
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†Straparollus asperostriatus Billings 1860
†Straparollus circe Billings 1860
†Straparollus eurydice Billings 1860
G. †Pleurotomaria Defrance 1826
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†Pleurotomaria americana Billings 1860
†Pleurotomaria helena Billings 1860
†Pleurotomaria progne Billings 1860