38 AMERICAN JOURNAL 



DESCRIPTION OP NEW SPECIES OF STREPOMATID^. 



BY GEORGE W. TRYON, JR. 



GoNiOBASis Haldemani, Tryon. — t. 1, £ 8. 



Melania anda, Lea. — Bell, Canadian Nat., pt. 3, p. 213. 

 Lewis, Boston Proceed., vi., p. 2. 



Melania exilis, Hald. — Adams, Moll., Vermont. 



Description. — Shell narrowly elongated, whorls nine, smooth, 

 flat, the last subangulated at the periphery ; aperture small, 

 subrhomboidal, lip slightly sinuous, columella, incurved ; color, 

 light horn, not banded, yellowish within. 



Length 1 inch ; diameter ^ inch. 



Habitat^ Lake Erie, Lake Champlain. 



Observations. — Eesembles P. elevatum, Say, but differs in the 

 aperture, is still more narrowly elongated, and the whoi'ls more 

 flattened, and is entirely without strife. In this last respect it 

 differs Avidely from that species, and much resembles P. Con- 

 radi, Nob. 



This species has long been known in our Cabinets as G. ex- 

 ilis, of Hald., but does not resemble that species in the remo- 

 test degree, as exilis is wider, with more convex whorls, and a 

 larger aperture. 

 2. Pleurocera Conradi, ^ryon. — t. 1, f. 9. 



Description. — Shell narrowly elevated, consisting of ten flat- 

 tened whorls, narrowly but distinctly carinated and angulated 

 on the periphery. The carinea are visible on each whorl of 

 the spire above the suture. Upper whorls carinated. Two or 

 three slight strise revolve on the body below the angle. Lines 

 of growth curved, very crowded. Aperture small, ovate, ob- 

 lique, shortly and rather widely anger shaped at the base. 



Color olive brown ; carina yellow, with a yellowband below 

 the sutures. Aperture and columella reddish 



Length 1 inch ; breadth -25 inch. 



Length of aperture "25 inch ; width of aperture "15 inch. 

 Habitat, Tennessee and Alabama. 



Observations. — This species has been very extensively distri- 

 buted by Mr. Anthony, as Melania 2:>yrenella, Conrad, while 

 Mr. Lea has regarded it as doubtfully identical with his elcn- 

 gaium. 



P. pyrenellum, as I have ascertained from an examination 

 of the type specimen, is a very much wider species, measur- 

 ing 1^ inch long, by | inch wide. It is of a light green color. 



