276 NEW MELANIDiE OF THE UNITED STATES. 



#a&.— Niagara Falls, New York, St. Lawrence at Montreal, E. Billings, Esq. 



My cabinet and cabinet of Mr. Billings. 

 Diam. -46, Length 1-36 inch. 



RemarJcs. — Many years since I found two specimens of this species above the Falls, 

 on the New York side. They were accompanied with Melania (Trypanostoma) 

 Niagarensis and subularis (nobis). I hesitated when I described the above two, 

 whether this was a new species. There is no doubt in my mind now. It is nearest 

 allied perhaps to Melania (Trypanostoma) Sayi, Ward, but it is a more slender species 

 and has a higher spire and more whorls. The aperture is rather more than the 

 fourth of the length of the shell. 



Teypanostoma paevtjm. PI. 36, fig. 91. 



Testa laevi, crassiuscula, conoidea, cornea, vittata vel evittata; spira conoidea; suturis regulariter im- 

 pressis; anfractibus octonis, planulatis ; apertura parva, rhomboidea, intus albida; labro acuto, pavuia 

 sinuoso ; columella inferno aliquanto incrassata et contorta. 



Shell smooth, somewhat thick, conical, horn-color, banded or without bands ; spire 

 conoidal ; sutures regularly impressed ; whorls eight, flattened ; aperture small, rhom- 

 boidal, within whitish ; outer lip acute, slightly sinuous ; columella slightly thickened 



below and twisted. 



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



Hah. — Knoxville, President Estabrook ; and French Broad River, East Tennessee, 

 J. Clark. 



My cabinet. 

 Diam. -34, Length -94 inch. 



Remarks. — I have three specimens of this small species from French Broad River 

 and one from Knoxville. They are all perfect, and have two bands, one broad and 

 well defined, the lower one obsolete. It is disposed to be slightly angular on the 

 periphery. The aperture is about one-third the length of the shell. This is among 

 the few small species of this genus. In outline and general appearance it is allied to 

 T. Hartmanii, herein described, but it is a very much smaller species and cannot be 

 easily confounded with it. 



Tetpanostoma modestum. PI. 36, fig. 92. 



Testa kevi, conica, siibtenui, virido-cornea ; spira subelevata; suturis linearibus ; anfractibus instar 

 septenis, convexiuseulis, ultimo subcompresso ; apertura parviuscula, subrliomboidca, iutiis ca;ruleo- 

 alba ; labro acuto, sinuoso, expanso ; columella inferne parum incrassata et contorta. 



Shell smooth, conical, rather thin, greenish horn-color ; spire somewhat raised ; 

 sutures linear; whorls about seven, somewhat convex, the last somewhat compressed ; 

 aperture rather small, subrhomboidal, bluish white within; outer lip acute, sinuous, 

 expanded ; columella slightly thickened below and twisted. 

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



