CTPRINA, 139 



many of the other Cassides are destitute of varices, and that an 

 operculum of C. coarctata was brought to this country by Mr. 

 Cuming. It is probable, however, that an increased knowledge 

 of facts might go far to establish the separation. C, Testiculus, 

 PI. xix. fig. 412. 



CTPE_^ADIA. Swainson, 1840. A genus of the family " Cy- 

 praeidse," Sw. thus described: — " Cyprseform ; the base con- 

 tracted ; the body whorl not flattened beneath ; shell cancellated ; 

 aperture of equal breadth throughout ; a few thickened, short 

 teeth on the pillar; lip at the base, which is not internally 

 concave. C. cancellata, Sw. Fossil only, differing from Trivea 

 in its contracted base, in the inequality of its aperture, and the 

 equal convexity of the inner lip within." (Sw. Lardn. Cyclop. 

 Malac. p. 325.) Cyprsedia, PL xxvi. fig. 564, 



CTPEi^LA. Swainson. Calpurnus, Montf. Ovulum verrucosum, 

 fig. 441. 



CYPEJEOVULUA. Gray. 1832. A genus of Cypr^id^ thus 

 described, " shell like a cowry, but front end of columella covered 

 with regular cross-ribs, like the rest of the base, internally pro- 

 duced into an acute toothed ridge. Shell pear-shaped, cross- 

 ridged." C. capense. South Africa. PL xxi. fig. 444. 



CTPEICAEDIA. Lam. Fam. Cardiacea, Lam. — Descr. Equi- 

 valve, inequilateral, subquadrate, transversely elongated, with 

 the anterior side very short ; hinge with three cardinal teeth and 

 one remote lateral tooth in each valve ; ligament external. — Obs. 

 This genus is distinguished from Cardita by the three cardinal 

 teeth. The moUusca of this genus are marine. Pacific Ocean. 

 C. angulata, PL vi. fig. 125. 



CYPEIKA. Lamarck, 1818. Fam. " Conques Marines," or 

 Marine Conchacea. — Descr. Equivalve, inequilateral, sub-orbi- 

 cular ; umbones curved obliquely ; hinge with three diverging 

 cardinal and one remote lateral teeth in each valve ; ligament 

 external ; muscular impressions two in each valve ; palleal 

 impression having a slight posterior sinus ; epidermis thick, 

 rough brown. — Obs. The Cyprinse belong to the Northern 

 hemisphere. The x'ecent species are not numerous. Possil 



