282 LAND AND FKESII-WATEK SHELLS OF N. A. [pART IV. 



■western States and is everywhere within their limits, a very 

 abundant species. 



I also add the following to the synonymy of this species ; 

 the description is drawn up fz-om a single specimen, a scalari- 

 form monstrosity : — 



JUJelania BabyloniCa. — Shell carin.ite, turreted, rather thick ; spire 

 rather elevated, striate at the apex ; sutures impressed ; whorls seven, 

 rig.547. angular above ; aperture rather large, elliptical, white. 

 Habitat. — Yellow Springs, Green Co., Ohio. 

 Diameter, -SG; length, -78 of an inch. 



Observations. — A single specimen only of this shell has 

 come under my notice. If the prominent character of this 

 specimen, the large carina on the superior part of the whorls, 

 be persistent, it marks a very distinct species. On the first four 

 whorls the strife are well defined. On the remaining three the carina 

 alone exists. The aperture is more than one-third the length of the 

 shell. — Lea. 



181. G. Haldemani, Tryox. 



Go7iiobasis JIaldemani, Tryon, Am. Journ. Conch., i, p. 38, 1. 1, f. 8, Feb. 25, 1865. 

 Melaiiia acuta, Lea, Bell, Canadian Nat., iv, pt.S, p. 213. Lewis, Bost. Proc, vi, 



p. 2. 

 Melania exilis, Haldeman, Adams, Moll. Vermont. 



Description. — Shell narrowly elongated; whorls nine, siuootli, flfrt, 

 the last subangulated at the periphery; aperture small, suorhom- 

 boidal ; lip slightly sinuous; columella incurved; color light horn, 

 not banded, yellowish within. 



Habitat. — Lake Erie; Lake Champlain. 



Diameter, ^ of an inch ; length, 1 inch. 



Observations. — Resembles P. elevation, Say, but diflfers in the aper- 

 ture, is still more narrowly elongated, and the whorls more ^ig. 5i'a. 

 flattened, and is entirely without stria). In this last respect 

 it difiiers widely from that species, and much resembles 

 P. Conradi (nobis). This species has long been known 

 in our cabinets as G. exilis, of Haldeman, but does not re- 

 semble that species in the remotest degree, as exilis is 

 wider, with more convex whorls, and a larger aperture. — Tryon. 



