107 
VENERICARDIA. 
Gen. Cuar. An equivalved lateral bivalve, ribbed 
longitudinally outside, with two thick hinge 
teeth disposed obliquely and in the same direc- 
tion; two strong muscular impressions. 
VENERICARDIA planicosta. 
TAB. L. 
Spec. Cuar. Subcordate, very thick, smooth, ribs 
broad and flat, about twenty, expanding into 
each other towards the margin; a few large 
teeth within the posterior edge. 
Syn. Venericardia planicosta. Lamarcke, Ann. du 
Mus. Vil. p. 55. IX. Tab. 31, Fig. 10. 
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Tue thickness of this shell is such as to leave but 
little space for the animal; it is particularly heavy about 
the hinge, which is large and very broad; the posterior 
margin is deeply indented towards the incurved beaks, but 
without a cordate mark. The length and breadth are nearly 
equal, often reaching four or five inches. 
I was some time since favoured with a fine small specimen 
from the Geological Society to make a drawing of for this 
work, but having since received this larger, although not 
quite so perfect a specimen, from the same place, viz. 
Bricklesom Bay in Hampshire, by favour of Mr. J. Hollo- 
way, I have preferred it for representation. The species is 
