Transactions - American Philosophical Society . p-per division smaller than the lower; anterior and posteriorcicatrices both distinct; the smaller posterior cicatrix is situ-ated against the end of the plate at the point of the divi-sion of the tooth; dorsal cicatrices situated on the under partof the cardinal tooth, perceptible; cavity of the shell verysmall and irregularly waved; an indistinct depressed linemay always be seen to pass from the great posterior cicatrixalong the base of the lateral tooth into the cavity of the beaks;nacre white. Remarks.—This shell is peculiar in the massive pl
Transactions - American Philosophical Society . p-per division smaller than the lower; anterior and posteriorcicatrices both distinct; the smaller posterior cicatrix is situ-ated against the end of the plate at the point of the divi-sion of the tooth; dorsal cicatrices situated on the under partof the cardinal tooth, perceptible; cavity of the shell verysmall and irregularly waved; an indistinct depressed linemay always be seen to pass from the great posterior cicatrixalong the base of the lateral tooth into the cavity of the beaks;nacre white. Remarks.—This shell is peculiar in the massive plate onwhich is situated its short and thick lateral tooth, as well asin the very small size of its cardinal tooth. It has scarcelyany cavity under the beaks, the shell being very thick. Itsepidermal rays, in perfect specimens, are very unusual to thisgenus; in old specimens they are almost or quite is remarkable also in its flat umbones. It resembles mostin form the gibbosus of Barnes, but is less rostrated and more PL. IX Unio piannlatuj Unio -miiltiradiatxu. T,^ OF THE FAMILY OF NAIADES. 433 thick. The gibbosus is seldom if ever perfectly white; allthe specimens I have seen of this are perfectly so. 6. Unio Circulus. Plate IX. fig. 14. Testa circulari, ventricosd, suh-aquilaterali; valvulis a-assis; natibusprominulis; dentibus cardinalibus lateralibusque inagnis; ligamentobrevi crassoque; margarita alba et iridescente. Shell circular, ventricose, nearly equilateral; valves thick; beaksslightly elevated ; cardinal and lateral teeth large ; ligament, short andthick; nacre pearly white and iridescent. rOhio at Cincinnati. T. G. Lea, Hab. < Monongahela at Pittsburg. T. Bakewell. ^ Tennessee at Nashville. Prof. Vanuxem. My Cabinet. Cabinet of T. G. Lea. Cabinet of Prof. Vanuxem. Cabinet of P. H. Nicklin. Cabinet of Dr Griffith. Cabinet of W. Hyde. Cabinet of W. Mason. Cabinet of J. Phillips. Cabinet of the Academy of Natural Sciences, Cabinet
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