208 VENUS. VENUS-SHELL. Class VI. 



(B.) Somewhat orbicular. 



20. retlexa. Mont. Test. Br. Sup. 40. 168. 



* V. with a suborbicular shell ; ridges nume- 

 rous, thin, reflected ; with an heart-shaped de- 

 pression of a different color from the shell, near 

 the hinge. 



Found on the coast of south Devon, and in 

 Scotla?id. 



21. tigeri- Gm. Lin. 3283. Mont. Test. Br. 11Q. t. 4. 



NA - Lin. Tr. viii. 86. t. 2./. 5. f.\. 



* V. with an orbicular shell, compressed ; ridges 

 decussated, with an oval depression near the 

 hinge ; diameter scarcely one inch. 



Found on the Dorsetshire coast. 



22. orbictj. Mont. Test. Br. Sup. 42. 



LATA. 



* V. with a white orbicular shell, depressed, 

 cancellated ; beak very small, with a minute 

 heart-shaped depression; lateral tooth much 

 more remote than in the preceding, which this 

 species in some measure resembles ; diameter 

 five-eighths of an inch. 

 Near Dunbar. 



