67 
PECTEN lamellosus. 
TAB. CCXXXIX. 
Spec. Cuar. Orbicular, convex; with concentric 
erect lamelle upon the surface, and diverg- 
ing striz near the beaks ; ears large, distinct. 
<== 
Born valves are convex, but the lower one is most so ; 
the front is semicircular placed a little obliquely; the 
straight sides, to which the ears are attached, connive 
to form a right angled beak; when the erect edges of the 
lamellz are broken off, which is commonly the case, 
the shell appears to be constructed of large imbricated 
plaits like an Oyster; small, irregular, impressed strizx, 
which are interrupted and gradually lost: towards the 
front, diverge from the beaks. 
I am indebted to Miss Benett for this Pecten; it 
occurs in the fifth bed of the Limestone of Chicksgrove 
quarry, described in Vol. II. p. 58; it is also found at 
Thame, in Oxfordshire, among Sand, of which a very 
large portion is dark green Talc, or Chlorite : this Sand 
belongs to the same stratum as the Limestone of 
Chicksgrove. 
