258 LAND AND FRESH-WATER SHELLS OF N. A. [PART IV. 



An exceedingly common species in various parts of Oliio, 

 extending into Michigan. It varies considerably in form and 

 size, but is larger and more elevated than depygis, which it 

 resembles in color and ornamentation. From graciUor it is 

 distinguished by its lighter color and convexity of the superior 

 half of the lip, -which in the latter species is incurved or flat- 

 tened. 



154. G. cinerea, Lea. 



Goniohasis cinerea, Lea, Proc. Acad. Nat. Sci., p. 2C5, 1862. Jour. Acad. Nat. Sci., 

 V, pt. 3. p. 301). t. 37. f. 145. Obs., ix, p. 12S. 



Description. — Shell smooth, conical, thin, ash-gray, bright : spire 

 obtusely conical, sharp-pointed, carlnate at the apex; sutures very 

 Fig. 498. much impressed; whorls eight, somewhat convex; aperture 

 rather large, subrhomboidal, bluish-white within; outer lip 

 acute, somewhat sinuous ; columella bent in, slightly thickened 

 and purplish. 

 Habitat.— South Carolina ; Prof. L. Vanuxem. 

 Diameter, -25 ; length, -CO of an inch. 



Observations. — A single specimen, of this gracefully formed species 

 was among a number of shells given to me by my friend, the late 

 Prof. Vanuxem. The exact habitat was not given. It is a thin, sub- 

 diaphanous species, of an ashen gray, with a remarkably thin epider- 

 mis. There is an obscure appearance of a band towards the upper 

 portion of the whorls and a purple oblique marking at the interior 

 of the base of the axis. It is allied to Ohioensis, herein described, 

 but it is more slender, thinner, and has a more elongate aperture. 

 The aperture is six-sixteenths the length of the shell. — Lea. 



This species is so nearly allied to G. pidchella that I much 

 doubt whether it is distinct. 



155. G. gracilior, Anthony. 



Melanin gracilis, Anthont, Cover of No. 4, Halt>ema>;'S Monog. Limniadcs. Dec, 

 28, 18U. Shells of Cinciniuiti, 1st edit. Newijeuky, Proc. Americau Associa- 

 tion for Adv. of Science, v, p. 105. Jay, Cat., 4th edit., p. 2T3. 



Melanin gracilior, Anthony, Ann. N. Y. Lye. Nat. Hist., vi, p. 129, t. 1, f. .5, 1854. 

 niGGiNS'Cat.,p. 7. BiNNEY, Check List, No. 127. Eeeve, Monog. Mclaniaj 

 sp.244. 



Melania f/racilis, Lea, Reeve, Monog. MeJania, sp. 3G9. 



Z>cscnj?^io».— Shell conical, smooth and shining, color dark brown, 



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