Transactions - American Philosophical Society . ing and decorticated; ligament large; epidermis black orblackish, and wrinkled transversely; cardinal teeth erect,crestlike, and double in both valves; lateral tooth curved,long, deeply divided and slightly serrate, the interior divisionemerging from the cavity of the beak; posterior cicatricesconiluent, anterior cicatrices very distinct; dorsal cicatricespass across the cavity of the beaks in a row*; cavity of theshell great; nacre pink and iridescent in the posterior margin. Remarks.—This shell is remarkable for the colour of itsepidermis and n
Transactions - American Philosophical Society . ing and decorticated; ligament large; epidermis black orblackish, and wrinkled transversely; cardinal teeth erect,crestlike, and double in both valves; lateral tooth curved,long, deeply divided and slightly serrate, the interior divisionemerging from the cavity of the beak; posterior cicatricesconiluent, anterior cicatrices very distinct; dorsal cicatricespass across the cavity of the beaks in a row*; cavity of theshell great; nacre pink and iridescent in the posterior margin. Remarks.—This shell is remarkable for the colour of itsepidermis and nacre. The perpendicular distance from thecardinal tooth to the basal margin is very small, while thatfrom the posterior end of the lamellar tooth to the same mar-gin is unusually great. It slightly approaches in form tosome varieties of the cariosus. * In a former paper of this volume, (page 262) I described the attaching mus-cles of the back of the animal, the impressions of which in the shell I propose tocall dorsal cicatrices. ,T,7/.. Uni/t ai^r Zfrnttn il£tt^lry J^Draytijti I OF THE FAMILY OF NAIADES, 427 2. Unio Rubiginosus. Plate VIII. fig. 10. Testa inaquUaterali, transversa, postice sub-hiangulari, antice rotun-data; valvulis sub-crassis; natibns prominentibus, recurvis, postice sub-angulatis; dente cardinali magna, laterali crasso ; niargaritd salmoniscolore. Shell inequilateral, transverse, sub-biangular behind and rounded be-fore; valves somewhat thick; beaks prominent, recurved, sub-angulatedbehind; cardinal tooth large; lateral tooth thick; nacre salmon co-loured. Hab. Ohio. My Cabinet. Cabinet of T. G. Lea. Cabinet of Prof. Vanuxem. Cabinet of the Academy of Natural Sciences. Diam. 1-2, Length 2-1, Breadth 2-6 inches. Shell somewhat ventricose; substance of the shell some-what thick; umbones slightly elevated: beaks recurved, sel-dom decorticated, almost touching, whitish, possessing severalconcentric undulations, which are lost along the umbonialslope, wh
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