236 CARDIUM. 



margin, which is serrated : the hinge resembles the other 

 species of this genus. 



Inhabits the Indian seas, and the coasts of China. 



ROUGH COCKLE. 



PI. 57./. 2, 3. Linnean Society's Cabinet. 



40. Cardiuin rigidum. C. testa subcordata, anterius subtruncata, costis 

 rugosis, prominulis. 



Shell somewhat heart-shaped, rather truncated before; ribs prominent, 

 and wrinkled. 



A small shell, of a whitish colour, with longitudinal 

 grooves, and ribs; the latter covered with a strong, 

 thick, wrinkled epidermis, which adheres very firmly to 

 the shell, but which, when removed, leaves the ribs 

 flattish, and smooth. Inside white; teeth of the hinge 

 strong. 



Country unknown. 



BROAD COCKLE. 



PL 57./. 4,5. Linnean Society's Cabinet. 



41. Cardium latum. C. testa lata, intequilater a, intus alba ; costis mag- 

 nis plants spinulosis. Linn. Gmel. p. 3254. 



Shell broad, of unequal sides, within white ; the ribs rather flat and spi- 

 nous. 



Testa transverse ovata, costis longitudinalibus muricatis, natibus violaceis. 

 Brug. Encyc. Meth. Hist. Nat. 6. p. 234. 



Knorr Vergn. 6. pi. 7. f. 6. Born Test. pi. 3. f. 2. Chem. Conch. 6. pi. 

 19. f. 192, 193. 



A strong shell, of a ferruginous colour, with the shape 

 of a Venus, but the characters of a Cardium ; it has flat 



