296 LAND AND yRESH-WATER SHELLS OF N. A. [PAKT IV. 



194. G. Troostiana, Lea. 



Melania Troostiana, Lea, Philos. Proc, ii, p. 34, April, 1841. Philos. Trans., p. 92, 



t. 23, f. 86. Obs. ii, p. 92. DeKav, Moll. New York, p. 100. Wheatley, Cat. 



Shells U. S., p. 27. Bixney, Check List, No. 276. Troost, Cat. Shells Tenn. 



Jay, Cat., 4th edit., p. 275. Catlow, Conch. Nomenc, p. 189. Bkot, List, p. 



35. Reeve, Monog. Melania, ep. 339. Tkoschel, Archiv fur Naturgesch., ii, p. 



227. 

 Juga Troostiana, Lea, Adams, Genera, i, p. 304. 



Description. — Shell elevated, brown, thickly striated; apex acute; 



whorls ten, above cariuate ; aperture oval. 



Habitat. — Mossy Creek, Jefferson Co., Tennessee. 



Diameter, -5 of an inch; length, 1-2 inches. 



Observations. — I owe to Professor Troost this interesting species. 



_. ^.„ It differs from any American species with which I am 

 Fig. 571a. ' ^ 



acquainted, in having a sharp carina, which is placed on 

 the superior part of the inferior whorls. In its numerous 

 striaj it resembles the 31. multilineata, Say, which is now 

 I believe conceded to be only a variety, much striated, of 

 M. Virginica of the same author. Most of the specimens, 

 which have come under my notice, are white inside, with 

 W] a purple spot on the columella, and an indistinct, light 

 band along the inferior part of the suture. Some indi- 

 viduals are, however, entirely purple inside, and this gives the epi- 

 dermis quite a black appearance. — Lea. 



195. G. latitans, Anthony. 



Melania latitans,A'STno-s\, Ann. Lye. Nat. Hist., New York, vi, p. 88, t. 2, f. 6, 

 March, 1854. Binney, Check List, No. 159. Brot, List, p. 34. 



Description. — Shell conical, obscurely striate, greenish-brown, rather 



thin ; spire elevated ; whorls 8-9, convex or subangulated, with three 



or four transverse striae above the angle, which become _. ,_^ 



"= ' Fig. 572. 



obsolete below it, and one or two brown bands at and 

 above the middle of each turn ; sutures distinct ; lines 

 of growth coarse, amounting almost to ribs on the lower 

 whorls; aperture not large, subrotund or very broad 

 ovate, reddish within and banded ; columella very much 

 curved and twisted, with a small sinus at base. 



Habitat. — Mammoth Cave, Kentucky. 



Diameter, -39 of an inch (10 millim.); length 1 inch (26 millim.). 

 Length of aperture, -34: (9 millim.); breadth of aperture -21 of an 

 inch (5 millim.). 



