96 Description of some New Species of Fossil Shells. 



Shell conical, ventricose, umbilicate, very thick, smooth, pol- 

 ished ; umbilicus small ; sutures impressed ; whorls four, flat ; 

 mouth round. 



Length -07. Breadth -05 of an inch. 



Remarlcs. — This little species has no remarkable characters, 

 but I cannot identify it with any described species. It some- 

 what resembles T. naticoides^ Lea, but its greater elevation and 

 small mouth, besides its not being so large, readily distinguish it 

 from that species. I regret that from my single specimen having 

 the mouth broken, I cannot determine whether it has the outer 

 lip refiexed. 



Genus Troghus. — LinncBUS. 



T. planulatus. PL 1. fig. 9. 



T. testa lenticnlata, sub-crassa, Isevi, polita ; anfractibus qua- 

 ternis, convexis ; ultimo anfractu acute carinato ; suturis parvis ; 

 umbilico magno ; apertura elliptica. 



Shell lenticular, somewhat thick, smooth, polished; whorls 

 four, convex ; last whorl acutely carinated ; sutures small ; um- 

 bilicus small ; mouth elliptical. 



Length -05. Breadth -1 of an inch. 



Rejnarks. — It is with considerable doubt that I have placed 

 this shell in the genus Trochus, to which it seems, however, to 

 belong, from the absence of crenulations on the umbilicus, which 

 is not as large as in most Solarim to which this shell would, at 

 first sight, be referred. Its mouth, however, is perfectly ellipti- 

 cal, which seems to indicate a connection with the Turbo, to 

 which, indeed, it bears a considerable affinity. It is remarkable 

 as being the first Trochus observed in the deposit at Claiborne. 



Genus Turritella. — Lamarck. 

 T. carinata. PI. 1, fig. 10. 

 T. testa turrita, crassa, transverse striata et carinata ; anfracti- 

 bus , valde convexis, carinatis medio ; suturis parvis ; aper- 

 tura rotunda, sub-eff"usa. 



Shell turrited, thick, transversely striate and carinated ; whorls 



, very convex, carinated in the middle ; sutures small ; mouth 



round, somewhat effnse. 



Length . Breadth -2 of an inch. 



