224 CARDIUM. 



of C. serratum, together with our British C. lavigatum, 

 which he considers as the same species ; that they are 

 distinct, however, will be evident on comparison, as the 

 C. oblongwm is longer in proportion to its breadth, and 

 is more conspicuously ribbed. It has thirty ribs, is of 

 a uniform yellowish, or rust colour ; and is about three 

 inches long, and nearly two inches and a half broad. 



Inhabits the Mediterranean, and warmer climates, 

 but is never found in the British seas. 



YELLOW COCKLE. 



23. Cardium flavum. C. testa subovata, sulcata, latere anteriore scabro, 

 posterior x dentato. Linn, Syst. Nat. ed. 12. p. 1123. Linn. GmeL 

 p. 3251. 



Shell somewhat oval, grooved ; the anterior margin rough, the posterior 

 toothed. 



Schrot. Einl. in Conch. 2. pi. 7. f. 11. a. b. 



The C. Jiavum, according to the description of 

 Schroter, is of an oblong-oval shape, with twenty-seven 

 ribs, five or six of which, on the anterior part of the 

 shell, are spinous, and twelve or thirteen, on the poste- 

 rior side, are tuberculated ; the intermediate ribs are 

 smooth, and rounded. The margin is crenated, and the 

 valves close every where, except before, where they are 

 a little open. The apex, and anterior part of the shell, 

 are white, the rest is of a sulphur yellow colour; the in- 

 side is white, except under the apex, which is reddish 

 yellow. 



Inhabits the coast of Coromandel, near Tranquebar. 



M . Schroter observes, that the yellow colour of this 

 shell is very superficial, since those specimens which 



