292 NEW MELANIDiE OF THE UNITED STATES. 



Trypanostoma Lewisii. PI. 36, fig 120. 



Testil sulcata, subtenui, clevato-conica, tcncbroso-fusca vel cornea, vittata; spira atteriuata; suturis pavum 

 impressis ; anfractibus instar undenis, planulatis ; apertura parva, subrhomboidea, intus vittata ; 

 labro acuto, parum sinuoso ; columella iuferne parum incrassata et valde contorta. 



Shell sulcate, somewhat thin, high, conical, dark brown or horn-color, banded ; spire 

 very much drawn out ; sutures slightly impressed, whorls about eleven, flattened ; 

 aperture small, subrhomboidal, banded within ; outer lip acute, slightly sinuous; colu- 

 mella slightly thickened below and very much twisted. 

 Proc. Acad. Nat. Sci., 1862, p. 172. 



Hob. — Peoria, Illinois, J. Lewis, M. D. 



My cabinet and cabinet of Dr. Lewis. 

 Diam. -47, Length 1-12 inch. 



Remarks. — I have three specimens before me, all of which differ slightly. Two are 

 dark brown and they are purple within. The third is light horn-color, with light brown 

 bands covering the greater part of the whorls. The upper whorls of all three are 

 carinate. It is allied to Melania (Trypanostoma) annulifera, Con., but it is a smaller 

 shell, more attenuate, and the aperture is more rounded at the base. The aperture 

 is about one-fourth the length of the shell. I have great pleasure in calling this after 

 my friend Dr. Lewis, of Mohawk, New York, who has aided me greatly by sending 

 me very many new shells from our fresh waters. 



Trypanostoma canalititjm. PI. 36, fig. 121. 



Testa canaliculata, conica, crassiuscula, cornea, obsolete vittata ; spira regulariter conica, subelevata, ad 

 apicem bivittata ; suturis impressis ; anfractibus planulatis, instar septenis, ultimo canaliculate ; 

 apertura parva, rliomboidea, intiis vel alba vel salmonia et vittata ; labro acuto et sigmoideo ; 

 columella contorta, ad basim recurva. 

 Shell canaliculate, conical, rather thick, horn-color, obscurely banded; spire 

 regularly conical, somewhat raised, double-banded towards the point ; sutures im- 

 pressed ; whorls about seven, flattened, the last canaliculate ; aperture small, rhom- 

 boidal, white or salmon, and banded within ; outer lip sharp and sigmoid; columella 

 twisted, recurved at the base. 



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



7I a 5 —Yellowleaf Creek, Alabama, E. R. Showalter, M. D. 



My cabinet and cabinet of Dr. Showalter, M. D. 

 Diam. -43, Length -99 inch. 



Remarks. — Three specimens are before me all of the same size, and having 

 the appearance of half-grown Melania (Trypanostcmia) canaliculata, Say, but they are 

 mature and evidently distinct. The channel above the middle of the whorl is smaller, 

 but well characterized. In the form of the aperture they are very much the same, 

 being auger-shaped like Cerithium. It is very nearly allied to Melania (Trypanostoma) 



