240 CARDIUM. 



TRIANGULAR COCKLE. 

 PI. 57. /. 7, 8. Linnean Society's Cabinet. 



49. Cardium hemicardium. C. testa cordata, subquadrilatera, valvulis 



carinatis, natibus distantibus. Linn. Syst. Nat. ed. 12. 1121. Linn. 



Gmel. p. 3246. 

 Shell heart-shaped, somewhat four-sided, with keeled valves, beaks distant. 

 Testa cordata, subtrilatera, antice carinata, sulcis longitudinalibus punc- 



tatis, ano ovato, piano. JBrug. Encyc. Meth. Hist. Nat. 6. p. 211. 

 Rumph. Mus. pi. 44. f. H. Petiver Aquat. Amboin. pi. 17. f. 4. Gualt. 



Test. pi. 83. f. c. Knorr Vergn. 6. pi. 3. f. 2. Chem. Conch, pi. 16. 



f. 159—161. Encyclop. Method, pi. 295. f. 2. b. c. 



This is a triangular, heart-shaped shell, of a whitish 

 or yellowish cast on the outside, and white and shining 

 within; there are, in some specimens, near the lateral 

 teeth, two brown oblong spots, which, in others, are 

 not to be seen. The ribs, which are twenty-three or 

 four in number, are rather flat, and smooth ; those on 

 the posterior part of the shell are tuberculated ; the an- 

 terior ribs are plain ; the intermediate grooves are 

 wrinkled, and marked with excavated dots. The inside 

 is white, and the margin deeply crenated ; the hinge has 

 four teeth, which are large and triangular, except the 

 middle one, which is but half the size of the others. 



Inhabits the East Indies. Rumphius says the island 

 of Ainboina. 



