Transactions - American Philosophical Society . ; nacre purple and irides-cent. Hab. Ohio. T. G. Lea. My Cabinet. Cabinet of T. G. Lea. Cabinet of Prof. Vanuxem. Cabinet of P. H. Nicklin. Diam. 1-4 inch. Length from beaks to base, 2-4 inches. Breadth 4-5 inches. Length from the top of the wing to base, 3-1 inches. Shell sub-triangular-ovate, inequilateral, sub-ventricose,transversely and very finely wrinkled, shining; substance ofthe shell thin, but compact; valves elevated into two wings,neither of them very high, the posterior one larger than theanterior, both connate; beaks scarcely promine
Transactions - American Philosophical Society . ; nacre purple and irides-cent. Hab. Ohio. T. G. Lea. My Cabinet. Cabinet of T. G. Lea. Cabinet of Prof. Vanuxem. Cabinet of P. H. Nicklin. Diam. 1-4 inch. Length from beaks to base, 2-4 inches. Breadth 4-5 inches. Length from the top of the wing to base, 3-1 inches. Shell sub-triangular-ovate, inequilateral, sub-ventricose,transversely and very finely wrinkled, shining; substance ofthe shell thin, but compact; valves elevated into two wings,neither of them very high, the posterior one larger than theanterior, both connate; beaks scarcely prominent, termina-tion pointed, and when not decorticated exhibit two or threevery minute elevations, almost requiring a microscope to dis-cover them; the purple nacre shows through the epidermishere, and gives the tips that colour; ligament concealed in thewing: sinus subquadrate; epidermis thin and purple brown;young specimens sometimes possess obscure bro\NTi rays; car-dinal tooth lamelliform, single in the left valve and disposed to TLXm vol
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