356 NEW MELANIDiE OF THE UNITED STATES. 



Steephobasis olivaeia. PL 39, fig. 229. 



Testa laevi clliptica, crassa, vittata, teuebroso-oliva ; spira obtuso-conica ; suturis valde impressis ; 

 anfractibus instar septcnis, convexis, ultimo pergrahdi; apertura subgrandi, rhomboidea, intiis 

 alba et vittata; labro aeuto, parum sinuoso; columella inferne incrassata et retrorsum contorta. 



Shell smooth, elliptical, thick, banded, dark olive ; spire obtusely conical ; sutures 

 very much impressed ; whorls about seven, convex, the last one large ; aperture 

 large rhomboidal, white within and banded; outer lip acute, slightly sinuous ; 

 columella thickened below and twisted backwards. 



Operculum ovate, very dark brown, with the polar point near the basal margin. 

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



Hab.— Knoxville, Tennessee, J. Clark. 



My cabinet. 

 Diam.-42, Length -99 inch. 



Remarks. — Some twenty specimens are before me, all having very much the 

 same size, form and general appearance. Generally there are two broad, well- 

 characterized bands, strongly marked on the inside and observable on the outside. 

 Two of the specimens have no bands, one has a single band, two have four bands 

 and three are purple inside. This species is nearest to solida, herein described, 

 but it is more elliptical, less ponderous and of quite a different color,— that species 

 being light horn-color. The aperture is about four-tenths the length of the shell. 



