38 
ASTARTE bipartita. 
TAB. DXXI.—fig. 3. 
Spec. Cuar. Obcordate, gibbose ; six or eight 
large undulations upon a flat space near the 
beak, the rest of the surface even; beaks 
acute ; edge toothed. 
Tue peculiar character of this shell is, that part of its 
surface is much flatter than the rest, and upon this por- 
tion are a few concentric waves, the rest of the surface 
being even and convex; the whole often appears dis- 
torted. In some specimens the two parts are not so 
distinctly marked: such are readily distinguishable from 
the last species by the size of the undulations, and the 
large, short, concave and smooth lunette. 
re 
ASTARTE oblonga. 
TAB. DXXI.—fig. 4. 
Spec. Cuar. Transversely oblong, convex; surface 
largely waved; beaks small; lunette cordate, 
pointed, concave ; edge crenated. 
More depressed, much wider, and differently formed 
about the beaks than the last, the young state of which. 
it might be supposed to resemble; the beaks are not very 
prominent. 
eee 
These four species of Astarte occur rather abundantly 
in the Suffolk Crag: the first and last appear to be the 
least common. 
