190 CARDIUM. COCKLE. Class VI. 



12. arcua- Lin. Tr. viii. 67. Mont. Test. Br. 85. t. b.f. 2. 



TUM.i 



* C. with an orbicular shell ; the s trite trans- 

 verse, arcuated. 



Mr. Montagu discovered this elegant species 

 in Falmouth harbour. 



13. DI3CORS. T. pisiformis. Gm. Lin. Lin. Tr. viii. 67. 



3241. ? Mont. Test. Br. 84. 



* C. with a shell somewhat orbicular, very 

 convex, the valves obliquely striated; size of 

 a pea. 



14. elonga- Lin. Tr. viii. 67. Mont. Test. Br. 82. 



TUM. 



* C. with a shell somewhat oval and angular, 

 compressed, with twenty-one rounded ridges, 

 lightly rugged ; diameter a quarter of an inch. 



Salcombe bay, Devon. 



15. MCRICA- Lin. Tr. viii. 68. Mont. Test. Br. 85. 

 TULUM. 



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

 white, with a muricated margin ; minute. 



Shepey island, Kent. 



