Transactions - American Philosophical Society . ces very perceptible, the line commencing withquite a large one on the under side of the callus betweenthe lateral and cardinal teeth, and terminating at the outerpart of the base of the cardinal tooth; marginal cicatrix veryperceptible; cavity of the beaks deep, large and rounded;nacre milk white, rarely iridescent. Remarks.—The specimen figured is the finest I have everseen of this species, and, taking it altogether, perhaps of anyother of the genus. The rays are very remarkably fine, and thenacre is purer and whiter than the finest porcelain.
Transactions - American Philosophical Society . ces very perceptible, the line commencing withquite a large one on the under side of the callus betweenthe lateral and cardinal teeth, and terminating at the outerpart of the base of the cardinal tooth; marginal cicatrix veryperceptible; cavity of the beaks deep, large and rounded;nacre milk white, rarely iridescent. Remarks.—The specimen figured is the finest I have everseen of this species, and, taking it altogether, perhaps of anyother of the genus. The rays are very remarkably fine, and thenacre is purer and whiter than the finest porcelain. It is veryfrequently, however, found with few or no rays, and the na-cre, though milk-white and pure generally, is not always double, deeply cleft, cardinal tooth of both valves, andthe raking position of that of the left valve are peculiar to thespecies possessing this general form, which includes the ova-tus and ventricosua. It seems to form the link between thesetwo. It differs from the ovatus in not possessing the flat
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