TRIBE CARDIACEA. 131 



—Ch. f. 49, r)0.— ^. t. 29(i. /'. 6.— C. Soleniforme. Brug.vo. 

 34.— Wood. G. C. t.5G.f. 3.— W. t. 5./. Sfi. Transversely ovate, 

 the anterior end produced gaping and seri'ated at the margin, the 

 posterior short narrow and obliquely rounded ; fragile with ob- 

 liquely radiating ribs, which are armed at both slopes, white 

 marbled with reddish chocolate and a faint purplish spot at the 

 beaks visible within and Avithout. If — 3Iartimque. 



C. PsEUDOLiMA. Lam. 13. — C. I. f. 67. Heart-shaped, 

 ventricose, white with thirty-eight flattened ribs which at the 

 umbones are smooth, and towards the margin become roughened 

 by a central row of minute tubercles. 4f. — Red Sea. 



C. Tuberculatum.* Lin. 1122.— D. p. l\7.— Lam. 16.— 

 E.t. 298. /. Z'i—Turt. Die. f. 12.— Don. 3. t. 107. f. 2.— 

 Wood. G. a i. 50./. 2.— W. t. 5./. 4. Somewhat globular and 

 ponderous, a little truncated antei'iorly, brownish, with twenty- 

 one ribs which as well as the interstices are coarsely wrinkled 

 transversely, the anterior ones armed with pointed tubercles, the 

 posterior with thick transverse scale-like plates. 3 J. — Yovng. 

 Strong, chocolate with white blotches, tuberculated. — Enghmd,SfC. 



C. AcuLEATUM.* Lin. 1122. — D.p. WA.—Lam. 14. — E. t. 

 298./. \.— Ch. f. 156.— List. 321./. \DS.—Don. t. 6.— Turf. 

 Biv. t. 13./ 6, 7. — W. t. 5./. 1. Somewhat globular, tumid, 

 not ponderous, brownish, a little angular on the anterior side, 

 with twenty-one I'ibs armed with transversely compressed spines, 

 which anteriorly are more acute, and posteriorly rather warty ; the 

 interstices striated transversely. 3^. — Europe.^ 



C. EcHiNATUiM.* Lin. \\22.—D.p. }16.—Lam. 12. Don. f. 

 107. / I.— Dorset Cat. f. 6. / 2.— W. t. 5. / 2. Somewhat 

 globose, convex, not thick, brownish white, slightly oblique, with 

 eighteen ribs armed with numerous sharp white spines which 

 curve towards the anterior side, and posteriorly are thicker and 

 more obtuse : the interstices transversely striated. Diam. 2. — 

 Young as the last, hut entirely white. — Europe. 



C. Erinaceum. Lam. 15.— Spinosum. D. p. 115. — E. t. 

 297. y. 5. — Ch.f. 157. Rounded heart-shaped, nearly equilateral, 

 whitish or tawny, with about thirty-five crowded longitudinal ribs, 

 which are marked along the middle with an obsolete groove, are 

 closely set with sharp spines anteriorly, and posteriorly with short 

 very obliquely mucronated tubercles. 3 . . 3. — Mediterranean. 



C. Isocardia. Lin. \\22.~D. p. US.— Lam. 17.— W. t. 5. 

 / \3.—Ch.f. 174, .5, 6.-E. t. 297. f. A.— Wood. G. C. t. 52. 



* The young of this species form the C. CiLiARE. Lam. 11. — 

 (W. f. b.f. 3.) and are fragile, glossy fawn colour, with the spines 

 longitudinally dilated at the base. 



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