Transactions - American Philosophical Society . nuibus ; umbonibus vix prominentibus; dente cardinali acuto, obliquo. Shell transversely elongated, compressed, subangular behind; valvesthin; beaks scarcely prominent; cardinal tooth sharp, oblique. Hab. Tar River at Tarborough. My Vanuxems of the Academy of Natural Sciences. Mr Nicklins -5, Length -7, Breadth 1-7 inches. Shell transversely elongated, elliptical—substance of theshell rather thin—beaks scarcely elevated, decorticated—liga-ment small, terminating between the beaks—dorsa
Transactions - American Philosophical Society . nuibus ; umbonibus vix prominentibus; dente cardinali acuto, obliquo. Shell transversely elongated, compressed, subangular behind; valvesthin; beaks scarcely prominent; cardinal tooth sharp, oblique. Hab. Tar River at Tarborough. My Vanuxems of the Academy of Natural Sciences. Mr Nicklins -5, Length -7, Breadth 1-7 inches. Shell transversely elongated, elliptical—substance of theshell rather thin—beaks scarcely elevated, decorticated—liga-ment small, terminating between the beaks—dorsal marginslightly curved; posterior dorsal margin carinated; posteriormargin subangular; posterior basal and basal margins curved;anterior and anterior dorsal and basal margins rounded—epi-dermis lemon-yellow and olive-yellow, with transverse linesof growlh, glabrous—cardinal tooth compressed, crenulatedand oblique—lamellar tooth straight, long and rather abrupt—posterior cicatrices confluent, anterior cicatrices distinct— TIL.
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