120 LAND AND FRESH-WATER SHELLS OF N. A. [pART IA% 



If an opinion founded on a single specimen, such as Mr. 

 Lea has described, be admissible, I would suggest the too 

 close resemblance of this shell to Conrad's vestitum (Lea's 

 mucronatum) . 



61. P. tenebrocinctum, Anthony i 



Melania tenebrocincta, Anthony, Proc. Acad. Nat. Sci., ji. 58, Feb., 18G0. Binney, 

 Check Li.^^t, No. 2G6. BuoT, List, p. 31. Reeve, Monog. Melania, sp. 271. 



Trypnnostnma jiarvum, LEA, Proc. Acad. Nat. Sci., p. 174, 18G2. Jour, Acad. Nat. 

 Sci., V, pt. 3, p. 276, t. 30, f. 'Jl. Obs., ix, p. 98. 



Description. — Shell couic ovate, smooth, rather thick; spire rather 



obtusely elevated ; whorls G-7, nearly flat, but with an obtuse carina 



^. below the middle of each, aud one more decided between that 



Fig. 227. 



aud the suture ; aperture well marked, and with a pale band 

 near it; lines of growth decided; aperture linear, ovate, 

 within dusky, and having two dark bauds there ; sinus very 

 decided. 

 Habitat. — Tennessee. 

 Observations. — Compared with 31. valida (nobis), it is 

 smaller, less robust, more slender, and may also be distinguished from 

 that plain species by its more lively exterior. The dark brown band 

 or bands contrast finely with the general color of the shell, and with 

 a light band near the sutures. — Anthony. 



The folloAving is Mr. Lea's description. 



T. parvum. — Shell smooth, somewhat thick, conical, horn-color, 

 banded or without bauds ; spire conoidal ; sutures regularly impressed ; 

 whorls eight, flattened ; aperture small, rhomboidal, within 

 whitish ; outer lip acute, somewhat sinuous ; columella 

 slightly thickened below and twisted. 



Habitat. — Knoxville ; Tresidcnt Estabrook : and Trench 

 Broad River, Tennessee ; J. Clark. 



Diameter, -34; length, -O-t inch. 



Observations.— I have three specimens of this small species 

 from rrench Broad River, and one from Knoxville. -They 

 are all perfect, aud 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. Ilarlmanii, herein described, but 



