52 VENUS. CYTHEREA. ISOCARDTA. 



Venif.'i there are three cardinal teeth, close toge- 

 ther, on each valve, with divergent lateral teeth, 

 V. kunellata is rare and beautiful, from the seas of 

 New Holland. There are many species of Venus 

 in a fossil state. In Cytherea we find four cardi- 

 nal teeth on the right valve, three of them near 

 together, the fourth quite apart. The left valve 

 has three cardinal teeth. C. Dione^ the thorny 

 Venus, is a pretty shell with spines. You may 

 easily procure it. 



" Astarte has some fossil species in the crag 

 and green sand : A. oJjllquata is one species. 



" Venericardia is wholly a fossil genus : one 

 species is found in the crag, V. senilis. 



" The family Cardiacea contains 



Cardiuyn Cockle 



Cardita Ch ama (some species .) 



Cypricardia 



Hiatella Mya. 



Isocardia Chama. 



" Isocardia cor is British. (Plate 9.) There 

 is a beautiful species, Isocardia moltkiana from 

 the East Indies, which is much valued by col- 

 lectors. 



" In the family Arcacea we find, 



Cuctdlea Area. 



Area JrcYf, ark-shell. 



