139 
CORBULA elegans. 
TAB. DLXXII- fig. I. 
Spec. Char. Subglobose, concentrically sulcated ; 
posterior side produced,, smooth, truncated; left 
valve subtriangular, smooth. 
Of this neat little Corbula one valve is gibbose, sharply 
sulcated, and has a smooth rather curved beak ; the other 
is flatter, angular, and smooth without a beak. It much 
resembles Corbula gigantea (tab. 209.) in miniature. 
Very abundant in the Whetstone Pits at Blackdown. 
CORBULA striatula. 
TAB. DLXXII .—Jigs. 2. & 3. 
Spec. Char. Ventricose, obovate, beaked, minutely 
striated ; valves nearly equal ; beak long, 
straight, channeled within. 
A larger species than the last, with more equal valves 
and distinct two-channeled beak. 
Very abundant in the ferruginous beds belonging to 
the Lower Greensand at Pulborough in Sussex. W. P. 
Martin, Esq. communicated the specimens. The shell 
has entirely disappeared, but the casts of both surfaces 
remain very neat -see fig. 3. 
