493 
PECTEN orbicularis. 
TAB. CLXXXVI. 
Srec. Cuar. Orbicular, much depressed, concen- 
trically striated ; strie elevated, sharp ; one 
valve smooth ; ears nearly equal, broadest at 
the base. 
A rut tender shell ; the striae are many, a line distant 
from each other ; the length and breadth are equal ; the 
ears rather large. 
One of the tender products of the green sand of the 
Devizes canal, preserved by Mrs. Gent. It appears to 
be unfrequent, as [ have seen but one individual. 
