163 
PECTEN grandis. 
TAB. DLXXXV. 
Spec. Char. Suborbicular, wider than long,, con- 
centrically striated, furnished with thirteen 
much elevated, rounded, more or less com- 
pound rays, each of which has generally a 
sulcus along its middle, and between each is a 
single secondary ray ; one valve rather con- 
vex, towards the beak concave, the other 
very convex ; ears nearly equal, square. 
A large Pecten, in general shape resembling P. maxi- 
mus, but differing in the form and structure of the rays. 
The concentric striae, as in P. maximus, are very irre- 
gular, and but little elevated upon the convex valve, 
while upon the other they are very regular, close, and 
raised into sharp laminae : the rays upon the convex 
valve especially are more elevated and deeply divided 
or sulcated, approaching to the form of those of P. Jaco- 
baeus, but differing from them in being much smoother 
and rounder. 
The Rev. G. R. Leathes, to whose liberality I am 
indebted for a series of specimens of this species, has 
a selected the trivial name grandis for it ; — not but that 
there are several fossil species found much larger, but 
as approximating to maximus , given to our common 
Escallop.’’ 
Occurs at Ramsholt in a native bed, and Newbourn, 
and in various other parts of the Suffolk Crag, 
