| OCR Text |
Show 744 DR. J. E. GRAY ON THE CALYPTRiEID^. [June 27, diately costated; the internal cavity small, compressed, open to the apex of the shell. Hab. ? 2. TRELANIA. Shell circular, depressed, conical; apex nearly central, acute ; nucleus subspiral; cavity circular, conical, with a narrow lunate deep compressed cup-shaped cavity attached to the inner surface of the shell by the apex and one of the sides, rest free ; the edge of the cavity complete and free from the inner surface of the shell. TRELANIA RADIATA. Calyptrcea radiata, Brod. Shell brown-rayed, with numerous narrow, close, regular, radiating striae. Hab. California. ** Gup-shaped appendage large, broad, triangular. " Cup-and-Saucer Limpets." 1. CATILLINA. Shell oblong, conical, radiately ribbed ; the apex acute, subcentral, recurved ; nucleus regular, spiral, of one whorl and a half; the cavity conical, with a broad trigonal cup on the left side under, but not extending to, the apex of the cavity, filled with a callous deposit at the tip ; the part of the cup next to the inner surface of the shell scarcely thickened and not raised up. CATILLINA PECTINATA. Shell conical, high, solid, thick ; the cup large, open, triangular, with the upper part filled with a thick calcareous deposit. Calyptrcea pectinata, Carpenter. C. concamerata, Reeve. (Chenu, Man. f. 2337, 2339.) Hab. ? Very like a small Crucibulum scutellatum. The upper part of the cup is always partly filled up by a calcareous deposit, and the edge of the cavity next to the inner surface of the shell is not thickened or raised. 2. DISPOTEA, Adams. •- Calypeopsis, Lesson." Shell circular, conical; the apex acute, posterior, recurved considerably above the edge ; nucleus subspiral, lateral; the cavity conical; apex subspiral, with a broad large trigonal cup-like cavity under the apex, attached to the cavity by one of its sides, the edge of which is not raised or thickened ; the outer or right lip of the cup straight, spreading, cavity open to the tip. This chiefly differs from the former genus in the inner lip not being reflexed over the cavity of the cup. |
