Transactions - American Philosophical Society . and shining; the wrinkles of the anterior wing, as theyascend the wing, are curved anteriorly and continuous overboth wings; each valve furnished with a long, curved, lamel-liform tooth, very small anteriorly to the beaks, larger andlonger posteriorly, pointed at both ends; anterior cicatricesdistinct: posterior cicatrices confluent; dorsal cicatrices situa-ted in the cavity of the beaks, very perceptible; cavity of thebeaks wide and very shallow; nacre thin, pearly, and irides-cent, with tints of salmon, white and purple; the undulationsvery per
Transactions - American Philosophical Society . and shining; the wrinkles of the anterior wing, as theyascend the wing, are curved anteriorly and continuous overboth wings; each valve furnished with a long, curved, lamel-liform tooth, very small anteriorly to the beaks, larger andlonger posteriorly, pointed at both ends; anterior cicatricesdistinct: posterior cicatrices confluent; dorsal cicatrices situa-ted in the cavity of the beaks, very perceptible; cavity of thebeaks wide and very shallow; nacre thin, pearly, and irides-cent, with tints of salmon, white and purple; the undulationsvery perceptible from the centre of the beaks along the baseof the tooth to the posterior dorsal margin. Remarks.—All the specimens which I have seen of thisremarkable species were brought from Canton. The firstwas received by Mr Hyde about two years since, and thenexcited much interest with our conchologists. Several speci-mens more perfect were brought last summer in the Cale-donia ; and from these specimens the description has been Smtpliyrwtti ii-alatic. Jh-mm UStujcI tiy XBraytmi OF THE FAMILY OF NAIADES. 447 made. That of Mr Hyde is a large, old, and valuable speci-men, but has lost some of its important characters. Bothwings are destroyed, the beaks much eroded, and the epider-mis black and much wrinkled, and the rays obsolete. Theremarkable waves at the base of the posterior wing are almostobsolete, and the beauty of the nacre nearly destroyed by be-ing thick and opake; cicatrices very perceptible. In thisspecimen, and I believe it will occur in all adult individuals,the only remains of the lamelliform tooth are in the termina-tion of it under the ligament, about an inch long; the restof it is lost in the callus of the dorsal margin. Its dimen-sions areDiam. 2-1, Length 5-5, Breadth 7-1 inches. In general form and character this species exteriorly resem-bles most the Sympliynota alafa; interiorly, except in colour,the Symphynuta Ixvissima, herein described; the
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