19 



CYPRINA planata. 

 TAB. DCXIX. 



Spec. Char. Cordiform, rather compressed ; sides 

 flattened towards the ventral margin ; beaks 

 large, not very prominent; lunette nearly flat, 

 imperfectly defined ; hing-e-slope flattened, 

 broad ; between the hinge-slope and each 

 side is a slightly depressed area; the principal 

 tooth in the rig-ht valve narrow. 



Ihe length and breadth are nearly equal ; the greatest 

 thickness of the united valves is near the beak ; the sur- 

 face is smooth, excepting near the margin and upon the 

 area on the sides of the hinge -slope, where the lines of 

 growth form irregular furrows ; the hinge-slope is so 

 flattened, that the specimen will stand upon it as upon 

 a base. 



Several examples of this handsome large fossil have 

 been found by Mr. Prestwich at Basingstoke, and small 

 individuals have been discovered in the clay at Brentford 

 and in Bracklesham Bay. 



