56 
CARD1TA similis. 
TAB. CCXXXII — Fig. a. 
Spec. Char. Rhomboidal, gibbose, transversely 
costated ; anterior part separated by a pro- 
jecting serrated keel ; lunette heart-shaped, 
nearly flat ; beaks involute. 
So exactly does this shell resemble the last that it is dif- 
ficult to point out any other difference than the form of 
the lunette ; however the costae are less prominent over 
the sides, and the front is less pointed. 
I have not seen the interior of this shell, but from its 
close resemblance to the last it must belong to the same 
genus : it is also from Dundry, and in Mr. Miller’s col- 
lection. Both species have somewhat the contour of 
several Trigoniae ; hence the name similis is doubly ap- 
plicable to the present. 
