350 NEW MELANIDvE OF THE UNITED STATES. 



bands. The aperture i.s a little more than one-fourth the length of the shell. 

 This species has so short a channel and so dilated an outer lip, that it is little 

 removed from the group of Melanidce, which has the. auger-shaped aperture, and 

 which I have called Trypanostoma. 



Genus TRYPANOSTOMA. 



Trypanostoma dignum. PL 39, fig. 219. 



Testa parum nodosa, subfusiformi, subcrassa, mellca, unifasciata ; spira elcvata, regulariter conica ; 

 suturis impressis; anfractibus instar octonis, planulatis, ultimo subgrandi; apertura ovato-rhombica. 

 intiis albida vel salmonia, uno-vittata ; labro acuto, sinuoso ; columella inflecta, contorta, ad basim 

 obtuse angulata. 



Shell slightly nodulecl, subfusiform, somewhat thick, honey-yellow, single-banded ; 

 spire raised, regularly conical ; sutures impressed ; whorls about eight, flattened, 

 the last rather large; aperture ovately rhombic, salmon or white within, single- 

 banded within; outer lip acute, sinuous; columella bent in, twisted, obtusely 

 angular at the base. 



Proc. Acad. Nat. Soi., 1862, p. 278. 



Hab. — Yeflowleaf Creek, Shelby County, Alabama, E. R. Showalter, M. D. 



My cabinet and cabinet of Dr. Showalter. 

 Diam. - 52, Length 1*06 inch. 



Remarks. — I have two specimens of this beautiful species before me. The smaller 

 has a well-defined row of small tubercles on the middle of the whorls. The larger 

 has an ill-defined, obscure row, which is partly made up by a raised line. Below 

 this is a well-marked capillary, brown band, which is distinct outside and in. The 

 clear, bright, smooth epidermis is of a honey-yellow, inclining to brown. In out- 

 line it is near to Melania ( Goniobasis) Vanuxemiana, (nobis), but it cannot be 

 confounded with that species. The aperture is more than one-third the length of 



the shell. 



Trypanostoma luteum. PL 39, fig. 220. 



Testa lsevi, obtuso-conica, subcrassa, stranrinea, evittata, mucronata ; spira obtuso-conica ; suturis 

 impressis ; anfractibus octonis, convexiusculis ; apertura parviuscula, rhombica, intus dilute stra- 

 minea; labro aeuto, sinuoso, ad marginem incrassato ; columella inflecta, inferne incrassata et contorta. 



Shell smooth, obtusely conical, rather thick, straw color, without bands, sharp- 

 pointed ; spire obtusely conical ; sutures impressed ; whorls eight, somewhat convex ; 

 aperture rather small, rhombic, pale straw color within; outer lip sharp, sinuous, 

 thickened near the margin ; columella bent in, thickened and twisted below. 

 Proc. Acad. Nat. Sci., 1862, p. 273. 



Hab. — South Carolina? Prof. L, Vanuxem. 



My cabinet. 



