Classification of Hamilton 1942
G. †Paraparchites Ulrich and Bassler 1906
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†Paraparchites marathonensis Hamilton 1942
G. †Healdia Roundy 1926
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†Healdia unispinosa Hamilton 1942
†Healdia vidriensis Hamilton 1942
G. Bairdia M'Coy 1844
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†Bairdia guadalupiana Hamilton 1942
†Bairdia permiana Hamilton 1942
†Bairdia rhomboidalis Hamilton 1942
†Bairdia subfusiformis Hamilton 1942
†Bairdia wordensis Hamilton 1942
Fm. Cytherellidae Sars 1866
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