NEW MELANIDJE OF THE UNITED STATES. 259 



tuberculate above, rather inflated ; aperture rather small, elongately rhomboidal, 

 whitish within, furnished with brown hair-like lines, channelled at the base and re- 

 curved ; columella sigmoid, slightly thickened above ; outer lip somewhat expanded, 

 acute at the margin. 



Operculum rather small, very dark brown, rhomboidal, with the polar point on 

 the left edge near the base. 



Lithasia imprrialk. Proc. Acad. Nat. Sci., 1861, p. 55. 



Hah. — North Alabama, Prof. Tuomey. 



My cabinet. 

 Diam. - 70, Length 1/55 inch. 



Remarks. — This is much the largest Lithasia I have seen. Although several of 

 the whorls of the vertex are eroded off, still it measures one and a half inches in 

 length. A single specimen only was received, and this without the operculum. 

 The tubercles are large and irregular, and not much raised. The capillary brown 

 lines in the interior are numerous and rather obscure, but this may not be the case 

 with more perfect specimens. They seem to replace the usual bands. They do 

 not reach the edge, which is bordered with white. Below the sutures there is a 

 stricture which nearly amounts to a furrow. It more nearly resembles Melania* 

 (Lithasia) Duttcmiana, (nobis), than any other known species, but it is a larger, 

 more ponderous species, and has not the numerous small tubercles, nor the bands 

 of that species. 



Lithasia Tuometi. PI. 35, fig. 68. 



Testa tuberculata, valde inflate, subcrassa, tenebroso-cornca ; spira obtuso-conoidca ; suturis impressis ; 

 anfractibus quinis, ultimo grandi, infra suturis oblique tuberculatis ; apertura magna, rliomboidea, 

 iutus albida, obsolete vittata, ad basim canaliculata ; columella, valde incurvata, superne et inferne 

 incrassata; labro expanso, margine acuto. 



Shell tuberculate, much inflated, rather thick, dark horn-color ; spire obtusely 

 conoidal ; sutures impressed ; whorls five, the last large, below the sutures obliquely 

 tuberculate ; aperture large, rhomboidal, whitish within, obscurely banded, channelled 

 at the base ; columella very much incurved, thickened above and below ; outer lip 

 expanded, acute at the margin. 



Lithasia Tuomei/i, Proc. Acad. Nat. Sci., 1861, p. 55. 



Hah. — North Alabama, Prof. Tuomey. 



My cabinet. 

 Diam. -64, Length 1-04 inch. 



Remarks. — A single specimen only was sent to me by Prof. Tuomey. It was 

 with L. imperialis, herein described. Being 1*04 of an inch in length and "64 in 



* This species was described before Mr. Haldeman established his genus Lithasia, to which this division 

 belongs and with which I have placed it. 



