NEW MELANID7E OF THE UNITED STATE?. 277 



Bab. — Chilogita Creek, Blount County, Tennessee, J. Clark. 



My cabinet and cabinets of Mr. Clark and Dr. Hartman. 

 Diam. -32, Length -80 inch. 



Remarks. — I have had a number of this species for some years, and had considered 

 it a variety of Melania (Goniobasis) dubiosa (nobis), but the difference in the outer lip, 

 which is much more expanded, and some other characters, render it specifically different. 

 The expanded outer lip, which is slightly thickened towards the edge, resembles that of 

 Whitei, herein described, but it has a longer channel and is not so truncate at the base. 

 It also differs in being a shorter species with a less number of whorls. None of the speci- 

 mens before me have bands. There is a disposition on the apicial whorls to be carinate. 

 None of the specimens were perfect at the apex. Every one was purplish above. The 

 aperture is about one-third the length of the shell. It is a very different shell from 

 Melania ( Goniobasis) modesta (nobis). 



Trtpanostoma mucronatum. PL 36, fig. 93. 



Testa Itevi, subulari, temii, diapbana, straminco-lutca; spira exserta, mucronata,; suturis leviter im- 

 presses ; anfractibus senis, superne planulatis ; apertura parviuseula, ovato-rbomboidea, iutiis luteo- 

 albida; labro acuto, sinuate ; columella ad basim parura incrassata, subeffusit et subrecurvS.. 

 Shell smooth, awl-shaped, thin, diaphanous, straw yellow ; spire extended, pointed ; 



sutures slightly impressed ; whorls six, flattened above ; aperture rather small, ovately 



rhombic, yellowish white within; outer lip acute, sinuous; columella slightly 



thickened at the base, subeffuse and somewhat recurved. 



Melania mucronata, Proc. Acad. Nat. Sci., 1861. p. 119. 



Operculum ovate, spiral, light brown, with the polar point on the inner side near 

 to the base. 



Hob. — Big Prairie Creek, Alabama, E. R. Showalter, M. D. 



My cabinet and cabinet of Dr. Showalter. 

 Diam. "36, Length -98 inch. 



Remarks. — This is an acuminate species with about eight regular graceful whorls, 

 which are towards the apex usually carinate. There are five specimens before me, all 

 without bands. One of them has, on the upper whorls, a disposition to take on a 

 brownish color. This species is allied to Melania (Goniobasis) Ocoeensis (nobis). It, is 

 not quite so subulate, has not quite so many whorls, and the aperture is not so quad- 

 rate. The aperture is not quite three-tenths the length of the shell. 



Trtpanostoma simplex. PI. 36, fig. 94. 



Testa lacvi, conica, subcrassa, luteo-olivacea ; spira subelevata ; suturis parum impressis ; anfractibus 



octonis, subconvexis, ultimo subconstricto ; apertura parva, constricta, rbomboidea, intus albida ; 



labro acuto, siuuoso ; columella iuferne incrassata et contorta. 



Shell smooth, conical, rather thick, yellowish olive; spire rather elevated; sutures 



somewhat impressed : whorls eight, somewhat convex, the last somewhat constricted ; 



71 



