32 
VENUS parva. 
TAB. DXVIII.—/igs. 4, 5 and 6. 
Spec. Cuar. Transversely obovate, rather convex, 
smooth ; lunette narrow. 
Tits species is very nearly orbicular; its form is so 
simple that it is not easy to describe how it differs from 
shells of other genera with which it is associated, al- 
though an accurate eye will readily observe it even 
when its hinge is not discoverable,—the degree of its 
convexity and evenness of its surface are the most ob- 
vious marks of distinction; it is less convex, and has 
besides a larger hinge than Thetis minor (tab. 513.), but 
is more convex and smoother than another shell (pro- 
bably a Lucina) that also occurs with it. The hinge, as 
far as can be learnt from casts, is similar to that of 
V. caperata above described. Abundant in the lower 
beds of Green-sand at Parham Park*, Shanklin Chine, 
and near Lyme. 
* By accident, the only specimens of the ferruginous stone 
from Parham Park containing casts of Gervillia solenoides (tab. 
510.) had been mislaid; and in consequence it was observed on 
page 16, that in Parham Park, Gervillia aviculoides (tab. 511.) 
is ** not accompanied with the G. solenoides.”’ 
