"Pecten" perplanus perplanus (Morton, 1833)
MORTON, S. G. 1833. Supplement to the "Synopsis of the organic remains of the ferruginous sand formation of the United States" (I). American Journal of Sience, 23: 288-294 [p. 293, pl. 5, fig. 5]
1833 Pecten perplanus Morton, 1833
1895 Pecten (Aequipecten) perplanus var? centrotus Dall, 1895
1895 Pecten (Aequipecten) perplanus var? centrotus Dall, 1895