145 
VENERICARDIA chamaeformis. 
TAB. CCCCXC .—fig. 1. 
Spec. Char. Convex,, orbicular, with rather pro- 
duced beaks ; ribs rugged, distant, about 14 ; 
hinge large. 
A trifle longer than wide, with the beaks a little 
curved so as to approach heart-shaped ; the spaces be- 
tween the ribs are flat, and serve, with the produced 
beaks, to distinguish this from the following. 
It is named by Mr. Leathes from its similarity in form 
to Chama arcinella. 
VENERICARDIA orbicularis. 
TAB. CCCCXC .—fig. 2. 
Spec. Char. Orbicular, rather convex, concentri- 
cally striated ; ribs about 16, not close, cre- 
nated ; hinge small. 
Generally smaller than the last, and perfectly orbi- 
cular ; the hinge teeth are shorter and thicker, and the 
ribs more distant than in the following. 
