AST ARTE obovata. 
TAB. CCCL1IL 
Spec. Char. Obovate, uniformly convex, cor- 
rugated ; lunette impressed ; anterior margin 
subtruncated, interior edge crenulated. 
The transverse rugae are most conspicuous upon the 
anterior part of the surface, where they are also some- 
what waved. From A. excavata, tab. 233, it may he 
distinguished by the anterior side not forming a separate 
lobe, and by being less elongated transversely. 
Found by Prof. Sedgwick in the inclined beds of the 
ferruginous Sandstone, beneath the green Sand, on the 
eastern side of Sandown-bay, on the Isle of Wight ; and 
mentioned by him in his paper on the Geology of the 
Isle of Wight, in the third Vol. new series of the Annals 
of Philosophy, p. 335, No. 5. 
