146 
PECTEN reconditus. 
TAB. DLXXV.—/igs. 5. & 6. 
Spec. Cuar. Orbicular, oblique, with above twenty 
rounded rays, the intermediate spaces not lon- 
gitudinally striated ; the whole surface cover- 
ed by concentric lines of sharp scales ; valves 
unequally convex, sulcated within ; ears de- 
fined, nearly equal. | 
Syn. Ostrea recondita? Brander, fig. 107. 
sae 
Very nearly resembling Pecten sulcatus (tab. 393. 
fig. 1.), but there is something, not easily described, in 
its general aspect, that has caused it to be separated by 
several acute observers. The most obvious mark of dis- 
tinction is the want of longitudinal strie between the 
rays; each ray at a little distance from the beaks is fur- 
nished with three rows of scales, while the spaces be- 
tween the rays have only one large scale: the valves 
only differ in convexity, together they are more convex 
than those of P. sulcatus, and more unequal. 
Common in Crag on various part$ of Norfolk and Suf- 
folk ; it is also sometimes found at Stubbington and Bar- 
ton, where P. sulcatus also occurs, but generally small. 
Brander’s fig. 107. is evidently taken from a damaged 
specimen. We quote it with doubt, because it is of a 
longer form. 
We have reason to suspect that P. sulcatus of M. C. 
is P. plebeius of Lamarck ; it is certainly P. plebeius of 
Brocchi, who quotes Lamarck, but it does not agree with 
Lamarck’s description, neither have we met with speci- 
mens from the neighbourhood of Paris that are nearly 
equal to it in size. 
