﻿SUPPLEMENT TO THE BIVALVIA. 



23 



2. Sphenia? minor, Forbes. Tab. B, fig. 16 a, b. 



Mya (Panop,ea) minor, Forbes. Mem. Geol. Surv., p. 146, pi. ii, fig. 4 ; and p. 149, 

 pi. iii, fig. 3, 1856. 



Spec. Char. " Shell transverse, compressed, elongately-ovate, very inequilateral ; the 

 anterior side narrow, posterior side slightly dilate, the surface corrugated by lines of 

 growth, giving it an obscurely sulcated appearance. The anterior is about one third as 

 long as the posterior portion, and the width about half the length. The urnbones are 

 nearer the anterior margin than in P. intermedia (Sow.), and the surface is less corrugated 

 than in P. corrugata or even P. intermedia" — Morris. 



Length, \\ inch ; height, -j^ths of an inch. 



Localities. Bembridge and Hempstead {Forbes). 



Mr. Morris, in describing Porbes' species in the Geological Survey Memoir on the 

 Isle of Wight, gives two varieties of this shell. 



I cannot myself perceive sufficient differences in this shell to justify its separation 

 from angustata, J. Sow., but as I am unwilling to disturb prior determinations under the 

 circumstances in which I am compelled to leave the description of the British Eocene 

 Mollusca incomplete, I have retained the species here. 



