. Transactions - American Philosophical Society. tance of the shellthin, thicker before; beaks prominent; ligament rather thin and short; epider-mis saffron-coloured, smooth and shining, with linear rays and numerousregular lines of growth; cardinal teeth small, single in the right and double inthe left valve; lateral teeth long and curved; anterior cicatrices distinct; poste-rior cicatrices confluent; dorsal cicatrices placed in the centre of the cavity ofthe beaks; cavity of the shell deep; cavity of the beaks deep and angular; nacresalmon-coloured and iridescent. Remarks.—Two specimens of t
. Transactions - American Philosophical Society. tance of the shellthin, thicker before; beaks prominent; ligament rather thin and short; epider-mis saffron-coloured, smooth and shining, with linear rays and numerousregular lines of growth; cardinal teeth small, single in the right and double inthe left valve; lateral teeth long and curved; anterior cicatrices distinct; poste-rior cicatrices confluent; dorsal cicatrices placed in the centre of the cavity ofthe beaks; cavity of the shell deep; cavity of the beaks deep and angular; nacresalmon-coloured and iridescent. Remarks.—Two specimens of this species are before me. One has nume-rous capillary lines radiating from the beak, while the other has but few andvery indistinct ones. It is most nearly allied perhaps to U. ochraceus, Say; butmay be distinguished by the colour of the epidermis, by the teeth being thicker,and by the inflation of the umbones. The posterior slope is without rays, andis somewhat rough. oi^r^a-flX^. €rn^ t_yA^. ^^t>.i2. t^&-^^€*^ Co^.St^^S^..
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