NEW MELANIDiE OF THE UNITED STATES. 275 



My cabinet and cabinet of Dr. Hartman. 

 Diain. -38, Length 102 inch. 



Remarks. — Only two specimens have come under my observation. One is not full 

 grown. In size and general outline this species has a very strong resemblance to 

 Melania strigosa (nobis), but it differs much in the aperture and the direction of the 

 base of the columella. The aperture is quite rhombic, like Melania Alexandrensis 

 (nobis). The apicial whorls are carinate and the aperture is about one -fifth the length 

 of the shell. 



Trypanostoma tortum. PI. 36, fig. 89. 



Testa kevi, conica, cornea, subcrassa; spira subobtuso-conica ; suturis valde impressis; anfractibus septenis, 

 planulatis; apertura subgvandi, subrhoinboidea, iutiis albidS vcl fuseii ; labro acuto, vix sinuoso; 

 columella valde iiieurvata, superne parum incrassata, inferno incrassata ct valde contorta. 



Shell smooth, conical, horn-color, rather thick ; spire rather obtusely conical ; sutures 

 very much impressed ; whorls seven, flattened ; aperture rather large, subrhomboidal, 

 white or brownish within ; outer lip acute, scarcely sinuous ; columella very much 

 incurved, slightly thickened above, more thickened below and very much twisted. 

 Proc. Acad. Nat. Sci. 1862, p. 174. 



Hab. — Little Uchee, below Columbus, Georgia, G. Hallenbeck. 



My cabinet and cabinet of Mr. Hallenbeck and Dr. Lewis. 

 Diam. -44, Length -96 inch. 



Remarks. — Several specimens of this species are before me. In one of the specimens 

 there are three or four obscure strias about the periphery. It is probable that others 

 may be found with this character more developed. On the upper whorls there is a raised 

 line revolving immediately above the suture, which causes the suture to be more im- 

 pressed. The columella is more than usually twisted, whence the name of the species. 

 Two of the specimens arc of a dull brown within, but have a whitish margin. The 

 aperture is rather more than the third of the length of the shell. 



Trypanostoma pallidum. PI. 36, fig. 90. 



Testa lrevi, attenuato-conica, subcrassa, pallido-eornea ; spira valde elcvata; suturis valde impressis; 

 aufractibus uudenis, convexiusculis, superne* subgeniculatis ; apertura parviuscula, subrhoinboidea, 

 intus alba; labro acuto, sinuoso ; columella alba et valde contorts,. 



Shell smooth, attenuately conical, rather thick, pale horn-color ; spire very much 

 raised ; sutures very much impressed ; whorls eleven, slightly convex, somewhat 

 geniculate above ; aperture rather small, subrhomboidal, white within ; outer lip 

 sharp, sinuous ; columella white and very much twisted. 



Operculum subovate, light chestnut brown, with the polar point on the left near 



the basal margin. 



Proc. Acad. Nat. Sci . 1862 p. 174. 



