I CONCHYLIA— l>/Tl/yjR^. 1. 



soft calcareous sandstone and submarine peat in Torbay, wWerf^e 

 we have taken it alive at the lowest equinoctial tides. 



lameiiata. Pholas testd latere antieo hianiissimo, postico rotundato sub- 

 clauso, margine supra denies lamelld erectd, accessoriis 

 nullis. 

 Shell very open at the anterior end, rounded and nearly closed 

 at the other, with an erect laminar process on the margin 

 above the teeth, and without accessorial valves. 

 Tab. nosi. 1. fig. 5 and 6. 

 Mas. nosf: Found with the last. 



Shell more than half an inch long, and an inch broad, oval, 

 whitCj without accessorial valves, with a very large oval opening 

 on the anterior side, where the margins of the valves are flattened 

 and a little reflected, and produced into a short beak, covered'-' 

 entirely with close-set rather oblique transverse crenate ribs',' 

 which beyond the longitudinal groove are coarser and straighter ; 

 the smaller end rounded and nearly closed : inside with a longi- 

 tudinal rib in the middle ; the teeth long, slender, and flat, anfd 

 on the margin above them is a triangular process, as in the 

 last. *• •• 



It has been suggested to us, that a belief h ^htfertained of this 

 shell being the young of Pholas papyracea. But as we have 

 opportunities of examining, each of them in every stage of their 

 growth, both perfect and with the valves separated, we can with' 

 confidence assert, that no two species of thfe same genus- ate'' 

 more dissimilar, and distinct iu their essential characters. 



Independently of the total want of the ring, and the large 



