PECTEN Jaminata. 
TAB. CCV.—Fig. 4. 
Spec. Cuar. Suborbicular, depressed, striated ; 
striz arched, diverging: ears triangular, un- 
equal ; the largest plaited. 
Tur strie are slightly undulated; to the naked eye they 
appear smooth, but when carefully examined with a 
lense, minute lines may be traced across them. The 
plaits upon the ear form a strong character, whence the 
name. 
In shelly Limestone (Cornbrash) at Chatley Lodge, 
in Somersetshire. 
—— 
PECTEN arcuata. 
TAB. CCV.—Figs. 5 and 7. 
Spec. Cuar. Orbicular, depressed, with arched 
punctured and diverging striz upon the sur- 
face: ears large ; the side beneath the largest 
is arched. 
A sMaut shell, prettily marked with arched, dotted, and 
sometimes forked furrows. The ears are dissimilar ; the 
largestis quadrangular ; they are both punctured. 
IT have a single valve of this (fig. 7.) in sandstone, 
along with Ostrea gregarea (tab. J11. f. 1 & 3.) from 
Devizes, and another upon Coral rag (fig. 5.) but not so 
perfect. 
