37 
ASTARTE imbricata. 
TAB. DXXI. —Jig. 1. 
Spec. Char. Cordate, orbicular, largely imbricated, 
convex; tooth in the left valve beneath the 
lunette small ; lunette elongated, flat ; hinge 
line arched ; edge finely crenulated. 
The surface is marked with about eight ridges one above 
the other, in the manner of tiles : these may possibly be 
exposed by wear, but their small number is remarkable. 
ASTARTE nitida. 
TAB. DXXI .—Jig. 2. 
Spec. Char. Transversely obovate, angular above, 
rather depressed, minutely sulcated near the 
beaks, the rest even ; beaks pointed ; lunette 
lanceolate ; edge crenated. 
Somewhat variable in form, the beaks being more pro- 
duced and nearer to one side in some specimens than in 
others : all the varieties agree in being minutely and 
neatly sulcated around the beaks, while the rest of the 
surface is smooth and even ; the whole surface is regu- 
larly convex. 
