366 TESTACEOUS MOLLUSCA. 



/. 96. — Midd. Mai. R. 3, p. 31. Transversely oboval, subinequi- 

 lateral, rounded at both ends, gaping in front, thin, ventricose, 

 ochraceous-white, usually with pale livid bands, radiated with deeper- 

 tinted flattened narrow numerous and smoothish ribs, their intervals 

 nearly as broad ; ventral edge arcuated, rising at both ends, par- 

 ticularly in front ; umbones oblique ; an obscure cordate lunular im- 

 pression with pouthig edges : inside rufous and livid purple ; only a 

 single distinct cardinal tooth in each valve, lateral teeth wholly 

 obsolete. %...li. Caspian Sea. The surface has most minute con- 

 centric wrinkles. 



Cardium parvum (t. 17, f. 39, as C. punctatum), Phil. Sic. 2, 

 p. 39, t. 14,/. 17. Shape and sculpture of C. Exiguum, but rather 

 more transverse, and less angular posteriorly, with the prominent 

 square-cut central ribs and their finely wrinkled intervals of equal 

 breadth. Colour brown or smoke-black, variegated with whitish, 

 especially on the umbones, and often speckled or subarticulated with 

 a similar hue on one or two of the anterior costae. %...\. Sicily, in 

 Lake Fusaro. The specimen figured was received from Philippi as 

 " C. punctatum of Renieri " (undescribed) ; two others subsequently 

 sent by him as " C. parvum" proved identical. 



Cardium scabrum (t. 17, f. 43), Phil. Sic. 2, p. 38, t. 14, /. 16. 

 This species proves identical with the C. nodosum of Turton, from 

 whose figure our own was copied. 



Cardium hystrix (t. 17, f. 46), Reeve, Z. P. 1844, p. 168; 

 I. Car. f. 40. Somewhat squarely cordate, tumid, concavely angu- 

 lated in front, with about 32 narrow compressed radiating ribs, that 

 are closely armed with erect scale-like slender spines, except the 

 anterior ones, which are only roughened with short small scales; 

 white, sometimes tinged with pink in the costal intervals, which latter 

 are concentrically traversed by raised striae, and edged on either side 

 with a scarlet line ; interior purple-red. 1£. Philippines. 



Cardium muticum (t. 17, f. 55). — C. papyraceum, Sow. C. I. Car. 

 f. 55. — C. m. Reeve, I. Car. f. 32. Transverse, suborbicular, sub- 

 inequilateral, thin, merely ventricose, ochraceous-yellow, mottled or 

 stained with liver-colour on the umbones ; surface neither scabrous 

 nor granular, radiated by fine and rather distant dotted impressed 

 lines, the intervals of which assume the aspect of flattened ribs, and 

 ventrally become slightly retuse in the middle near the sides ; ex- 

 tremities with slight and depressed costellse, the dotted line being 

 there the middle of the riblet; ventral edge much arcuated, rising 

 more particularly behind ; dorsal slopes inconsiderable, the front one 

 subhorizontal ; hinder lateral teeth very large. 2£...2f. There 

 are some arched concentric raised wrinkles near the posterior ventral 

 edge. 



