212 CARDIUM. 



PIGMY COCKLE. 



6. Cardium exiguum. C. testa subcordata, subangulata, costis recur- 



vato-imbricatis. Act. Soc. Linn. 8. p. 61. 

 Shell somewhat heart-shaped, subangular; ribs recurved and imbricated. 

 Testa oblongiuscula, incequaliter costata, subfusca. Linn. Gmel. p. 3255. 

 List. Conch, pi. 317. f. 154. Walker Minut. Rarior. f. 83. Donov. 



Brit. Shells, pi. 32. f. 3. Pult. in Hutch. Dorset, pi. 2. f. 11. Mont. 



Test. Brit. p. 82. Penn. Brit. Zool. 1812. 4. p. 186. 



A very small shell, about the size of a currant, of a 

 white or ochreous colour, with twenty tuberculated ribs, 

 and transversely striated furrows ; inside white. 



Inhabits the British shores, and was first found by 

 Mr. Boys at Sandwich ; also by Dr. Maton, and Mr. 

 Montagu in Falmouth Harbour. 



KNOTTY COCKLE. 



7. Cardium nodosum. C. testa rotundata, compressa ; costis 24, tuber- 



culis numerosis, obtusis. Act. Soc. Linn. 8. p. 66. 

 Shell round, and compressed ; ribs 24, tubercles numerous, blunt. 

 Mont. Test. Brit. p. 81. Penn. Brit. Zool. 1812. 4. p. 189. 



A flat, somewhat orbicular shell, of a reddish white 

 colour. The inside is white and glossy, the margin is 

 strongly toothed. Diameter of the shell, about three 

 quarters of an inch. 



Inhabits the coast of Devonshire, and was discovered 

 amongst some sand, from Falmouth Harbour, by Mr. 

 Montagu. 



