280 NEW MELANIDiE OF THE UNITED STATES. 



Trtpanostoma Vanuxemii. PI. 36, fig. 08. 



Testa lrevi, conoidea, flavida, vel bivittata vel evittata ; spira obtuso-coniea ; suturis impressis ; anfrae- 

 tibus senis, convexiusculis ; apertura parviuseula, subrliomboidea, intus albida ; labro aouto, sinuoso ; 

 columella infem6 incrassata et valde contorta. 



Shell smooth, conical, yellowish, double-banded or without bands ; spire obtusely 

 conical; sutures impressed, whorls six, somewhat convex; aperture rather small, 

 subrhomboidal, whitish within ; outer lip acute, sinuous ; columella thickened below 

 and much twisted. 



Proc. Acad. Nat. Sci., 1862, p. 175. 



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



My cabinet and cabinet of Prof. L. Vanuxem. 

 Diam. -28, Length -60 inch. 



Rernarles. — Among other species of the Melanidce given to me a long time since by 

 my friend, the late Prof. Vanuxem, were four specimens of this. Three of them are 

 double-banded inside and out. The fourth has no appearance of bands. One of them 

 is about half grown and perfect to the apex. The outer lip is somewhat thickened 

 and expanded. It is somewhat like bivittatum, herein described, but it differs in having 

 a higher spire, is not so wide proportionally, and is not highly polished or so yellow 

 as that species. The aperture is more than one-third the length of the shell. 



Tetpanostoma Chakasahaense. PL 36, fig. 99. 



Testa laevi, conica, fusco-virente, subtenui, bivittata ; spira subattenuata ; suturis valde impressis ; anfrac- 

 tibus instar octonis, convexis, superne carinatis; apertura parva, rliombica, intus alba et vittata; 

 labro acuto, sinuoso; columella incurvfi, inferne incrassata et valde contorta. 



Shell smooth, conical, brownish green, rather thin, double-banded ; spire somewhat 

 attenuate ; sutures, very much impressed ; whorls about eight, convex, carinate 

 above; aperture small, rhomboidal, white and banded within; outer lip sinuous; 

 columella incurved, thickened below and very much twisted. 

 Proc. Acad. Nat. Sci., 1862, p. 175. 



Rob. — Chakasaha River, Alabama, Wm. Spillman, M. D. 



My cabinet and cabinet of Dr. Spillman. 

 Diam. -36, Length -87 inch. 



Remarks. — Of eight specimens received from Dr. Spillman, three of them had trans- 

 verse striae on the periphery of the whorls reaching to the last whorl, on which two 

 raised stria? are noticeable. In general outline and size it is near to parvum, herein 

 described, but differs in being flatter on the whorls, in the bands being more distant, 

 and in having a less twisted columella. It reminds one of M. gracilis, Anth., but has 

 many distinctive characters. The aperture is about one-third the length of the 

 shell. 



