145 
VENUS angulata. 
TAB. LXV. 
ae er EE iere re 
Spec. Cuar. Obtusely cordate, broader than long, 
beak short, an angular rising on the anterior 
side, which is slightly truncated, smooth; 
margin entire; larger hinge-teeth placed at an 
angle of about 60°. 
a nn a ae 
"Two inches and three-quarters long, three and a quarter 
wide, rather slender. The two prominent teeth of the 
hinge are placed at a curved* angle of about 60°. In the 
posterior side of the hinge of the shell is a rather roundish 
hollow to receive a tooth on the opposite valve. 
This shell very much resembles the recent Venus Island- 
ica, but the hinge-teeth are much narrower, and the angle 
at the ridge is rather undulated and less conspicuous, and 
spreads more externally, but is better seen internally. It 
has some resemblance to Venus mercenaria, but that has a 
serrated edge. It may be proper to observe that in Mr. 
Pennant’s British shells+ this latter is mistaken for the 
former. 
Desirous of determining this Blackdown siliceous Fossil, 
Mr. Parkinson kindly lent me a specimen much larger than 
the figure, by which, with a smaller one by favor of Miss 
* Tab. 20. V. planus, angle not so curved. + Edition 4, 
