272 NEW MELANIDiE OF THE UNITED STATES. 



Trypanostoma Christyi. PI. 36, fig. 83. 



Testa laevi, clevato-conica, crassiuscula, cornea, raro-vittata ; spira. valde elevata; suturis regulariter ini- 

 pressisj anfractibus instar denis, parutn convexis; apertura pai^a, subrhoniboidea, intus albida; labro 

 acuto, sinuoso; columella alba et contorta. 



Shell smooth, elongately conical, somewhat thick, horn-color, rarely banded ; spire 

 very much elevated ; sutures regularly impressed ; whorls about ten, slightly convex ; 

 aperture small, subrhomboidal, whitish within; outer lip acute, sinuous; columella 

 white and twisted. 



Operculum subovate, dark-brown, with polar point near to the basal margin. 

 Proc. Acad. Nat. Sci., 1862, p. 173. 



Hah, — Cane Creek, Tennessee, Prof. D. Christy. 



My cabinet and cabinet of Dr. Hartman. 

 Diam. -48, Length 1-12 inch. 



Remarks. — I am indebted to the late Joseph Clark for many specimens from the 

 above habitat, brought by Prof. Christy. It is allied to Estabroohii, herein described, 

 but it is a larger and heavier shell, has a larger aperture, a much more twisted colu- 

 mella, and is of a darker horn-color. One of the specimens is somewhat carinate on 

 the body whorl, and has a more developed channel. The form of the channel is 

 very like to Melania {Trypanostoma) regularis (nobis), but it is not so cylindrical nor 

 so green. The aperture is about the third of the length of the shell. I name this 

 after Prof. David Christy, Hamilton, Butler Co., Ohio, who collected many fine shells 

 in East Tennessee and North Carolina, which he kindly gave to Mr. Clark. 



Trypanostoma labiatum. PI. 36, fig. 84. 



Testa lajvi, acuto-eonica, subcrassa, nidita, virido-cornea, ; spira, attenuata, mucronata ; suturis regulariter* 

 impressis ; anfractibus instar denis, convexiusculis, ad apicem carinatis, ultimo subgrandi ; apertura 

 parviuscula, rhomboidea, intus albida. ; labro aeuto, juxta. marginem incrassato, valde dilatato, valde 

 sinuoso ; columella albida, inferne incrassata et valde contorta. 



Shell smooth, acutely conical, rather thick, shining, greenish horn-color; spire at- 

 tenuate, sharp-pointed ; sutures regularly impressed ; whorls about ten, somewhat 

 convex, carinate towards the beak, the last rather large; aperture rather small, rhom- 

 boidal, whitish within ; outer lip sharp, thickened towards the margin, very much 

 dilated and very sinuous ; columella whitish, thickened below and much twisted. 



Operculum subovate, dark brown, rather thin, with the polar point near the middle 

 towards the base. 



Proc. Aead. Nat. Sci., 1862, p. 173. 



Hob. — Big Miami River, Ohio, J. Clark. 



My cabinet and cabinets of Mr. Clark and Dr. Hartman. 

 Diam. -43, Length -98 inch. 



Remarks. — A number of these were sent to me some years since, by Mr. Clark. 



