40 
TEREBIIATULA ? imbricata. 
TAB. CCCXXXI V.—Figs. 3 and 4. 
Spec. Char. Transversely oval, gibbose, im- 
bricated ; longitudinally sulcated ; front 
slightly elevated ; sulci obsolete. 
Rather longer than the last ; the surface is composed 
- r • 
of about 12 sulcated laminse lying close upon each other, 
with remote edges ; the beaks are prominent incurved ; 
the hinge line short, and the front very slightly sinuated. 
Fig. 3 is taken from a Derbyshire Limestone specimen, 
and fig. 4 from one found at Settle in Yorkshire. This 
species has probably been confounded with the pre- 
ceding by Martin. 
