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Show 1867.] DR. J. E. GRAY ON THE CALYPTRjEIDiE. 745 * Cup conical, deep; shell striated, edge crenated. 1. D I S P O T E A STRIATA, Adams. Calyptrcea striata, Say; Chenu, Man. f. 2342. Shell circular, radiately costated ; costae interrupted by the smooth lines of growth ; the cup conical, deep ; the right edge straight, even. See D. cancellata, Adams & Reeve. ** Cup concave, shallow; shell smooth, edge even. 2. DISPOTEA BILOBATA. " Calyptrcea bilobata, Gray." Shell thin, oblong or ovate, white, brown-rayed, smooth, minutely rugulose, sublaminal; the cup concave, shallow, the right lip flexuous, two-lobed. Hab. California. 2. CRUCIBULUM, Schumacher; Adams. Biconia, Swainson. Calyptropsis, Brod. (not Lesson). Dispotea, Say. The shell circular, depressed, conical; apex nearly central, acute ; nucleus subspiral ; cavity circular, conical, with a broad subtriangular cup-shaped cavity attached by the upper part of one of its sides, but with the edges free from the cavity of the shell on every side. In the young shell the internal cup is imperfect, consisting of a narrow triangular curved subspiral cavity, without any shelly deposit on the inner side of the cup next to the surface of the shell. As the shell enlarges, the width of the side of the cup decreases, and the edge is completed and at length elevated from the inner surface of the shell. * The internal cup broad, rather longer than broad. 1. CRUCIBULUM SCUTELLATUM. Calyptrcea scutellata, Gray. Crucibulum imbricatum, Brod. C. umbrella, Desh. (shell very flat). C. lignaria, Brod. C. corrugatum, P. Carpenter. C. ferrugineum, Reeve. C. trigonate, Adams & Reeve. C. rugosum, Deshayes. C. tenuis, Broderip. Dispotea spectrum. Shell solid, brown (or pale, with brown rays), with broad flat radiating and concentric ridges, or more or less smooth and closely radiately striated (Chenu, Man. f. 2332, 2335, 2338). Hab. West Coast of America; Valparaiso j Chiloe; Gulf of California. P R O C . Z O O L . Soc-1867, No. XLVIII. |