CARDIUM. 243 



DIANA HEART COCKLE. 

 PL 58./. 4, 5. Mr. Jennings. 



52. Cardium retusum. C. testa cordata, valvulis striatis, crenulatis, 



subcarinatis ; ano lunato cordiformi intruso. Linn. Syst. Nat. ed. 



12. p. 1121. Linn. Gmel. p. 3245. 

 Shell heart-shaped, valves striated, crenated, and somewhat keeled ; 



a lunate, heart-shaped hollow behind the beak. 

 Testa cordata, umbonibus carinatis, sulcis longitudinalibus punctatis, 



costis granulatis, ano lunari intruso. Brug. Encyc. Meth. Hist. Nat. 



6. p. 210. 

 Rugenf. Conch. 2. pi. 9. f. 20. Born Mus. pi. 3. f. 1, 2. Chem. Conch. 



6. pi. 12. 139—142. Encyclop. Method, pi. 294. f. 3. b—d. 



A white, shining shell, sometimes straw-coloured* 

 and occasionally spotted with red. It is marked with 

 about twenty-one longitudinal grooves, formed of mi- 

 nute sunk points, which give the shell the appearance 

 of being striated transversely ; the ribs are smooth and 

 convex, the largest behind, and tuberculated. The 

 inside is white, and glossy ; the margin is crenated ; 

 there are three teeth in one valve, and four in the other; 

 the moon-shaped hollow, behind the beaks, is a re- 

 markable character in this shell. Large specimens 

 measure nearly two inches in length and breadth. 



Inhabits the East Indies, the Persian Gulf, and the 

 Red Sea. It is a rare shell, and valuable when marked 

 with red spots. 



