27 
ISOCARDIA similis. 
TAB. DXYI. —Jig. 1. 
Spec. Char. Transversely rather oblong*, ventri- 
cose, slightly flattened; anterior side small, 
turned a little up ; edge of the base nearly 
straight. 
A large strong shell, which differs from the recent Iso- 
cardia Cor only in having a straighter edge to the base, 
a larger anterior side, and a slight flatness of the middle 
of the disk. The base line being straight, makes it rather 
wider than long. 
Found at Sandgate near Margate, in the upper Green- 
sand. It consists of the original calcareous matter of the 
shell somewhat loosened in its texture. 
ISOCARDIA Cor ? 
TAB. DXYI. —fig. 2. 
From the small fragments that are sometimes found of 
an Isocardia in the Suffolk Crag, we are able to draw no 
other conclusion, than that they belong to the same spe- 
