186 CARDIUM. COCKLE. Class VI, 



GENUS VIII. CARDIUM. COCKLE. 



Animal, a Tethys. 



Shell nearly equilateral, equivalve. 



Teeth two, near the beak: a larger (placed 



remote) on each side; each locking into 



the opposite. 



1. MEDIUM. Gm. Lin. 324:6. Mont. Test. Br. 83. 



Lin, Tr. viii. 6l. 



* C. with a shell somewhat heart-shaped, and 

 rather angular ; valves angular, furrowed, 

 smooth; diameter one inch. 

 Found at Hartlepook, Durham. 



2. EXIGUUM. Gm. Lin. 3255. 31ont. Test. Br. 82. 



Lin. Tr. viii. 6l. 



* C. with a shell somewhat heart-shaped, and 

 rather angular ; the grooves strongly striated 

 transversely ; diameter half an inch. 

 Sandwich and Falmouth harbour. 



