310 LAND AND KRESII-WATER SHELLS OF N. A. [PAKT IV. 



peculiar form of operculum," but I have never seen any operculum 

 of the Mdanioi take this long tongue-shaped form but in this species.* 

 Having asked Dr. Showalter if he had observed whether the opercula 

 of young individuals were spiral, he very kindly sent me one about 

 one-third grown. This was in no way different from the adults 

 except in size, being rather more than one-third of an inch long. He 

 sa3's that he " finds the 3'oung specimens of this species have the 

 same peculiarity in the operculum." Should there be found to exist 

 any difference in the anatomical structure of tliis mollusk, when the 

 soft parts shall be examined, then it must be eliminated from the Gon- 

 iobases. In which case I propose the name of Jlacrolimen f for it. 

 Among nearly a dozen specimens which I have examined, none have 

 a perfect apex. The length of the shell, thei-efore, cannot be stated, 

 nor the exact number of whorls, nor the character of the very j'oung. 

 The length of the aperture is probably nearly half the length of the 

 shell. All the specimens I have examined are handsomely adorned 

 with four bands, more or less distinct inside and out. It is nearly 

 allied to suavis (nobis) and bellula (nobis), and reminds one of Letcisii 

 (nobis). — Lea. 



216. G. clausa, Lea. 



Melanin claicsa, Lea, Proc. Acad. Nat. Sci., ISOl, p. 120, v, pt. 3, p. 231, t. 34, f. 25, 



March, 1803. 

 Goniobasis clausa, Lea, Jour. Acad. Nat. Sci., Obs., ix, p. 53. 



Description. — Shell smooth, subfusiforra, thick, olive, banded, or 

 without bands ; sutures very much impressed ; whorls seven, some- 

 Fig. 59G. what convex; aperture small, constricted, elliptical, whitish 

 within ; outer lip acute ; columella slightly intlected, ob- 

 tusely angular at base. 



Habitat. — Coosa lliver, Alabama; E. R. Showalter, M.D. 

 Diameter, '42 of an inch; length, 1-2 inches. 

 Observations. — This species reminds one at once of Fupa 

 crysulis, Fer., but the outline is more fusiform. It is nearly 

 allied to Ilelania jnq^a^formis, Anth., but it is a larger and stouter 

 shell and is not so much banded. The aperture is narrow and unu- 

 sually closed. Some specimens are feebly banded, while others have 

 the usual four bands very broad, which make the interior dark, and 



*I liave several specimens of A. rubiginosa (nobis) wliich have an elongated 

 operculum, but I have never observed it in any other species of Anculosa. 



■f/iaKpocr, longus; At/xo', portus. 



