75 
PECTEN papyraceus. 
TAB. CCCLIV. 
Spec. Char. Depressed, obliquely oval, with 
large unequal, rectangular ears, striated, 
very thin. 
Numerous elevated stri®, that are decussated, upon 
the larger ear especially, by lines of growth, cover this 
very thin flat shell : there is no sinus between the ears 
and the rest of the shell, so that it is not easy to say 
where they begin : the length exceeds the width about 
one-fourth : the two valves are very nearly equal. 
Preserved in the Woodwardian cabinet at Cambridge 
by the late Prof. Hailstone, who obtained it in the schale 
of North Ouram Coal-pits, near Bradford. It is a 
curious circumstance that a marine shell should be 
found so near the remains of land vegetables common in 
the Coal formation, a formation in which shells of any 
kind are very rare, and where hitherto only fresh-water 
ones had been found. Casts of Pecten are very abun- 
dant in the Schale filled with decomposing Iron Pyrites ; 
no other shells accompany them except rarely an indis- 
tinct species of Anomia. The specimens are decaying 
very rapidly. 
