198 LAND AND FRESH-WATER SHELLS Ol' N. A. [PART IV. 



Description. — Shell folclad, somewhat drawn out, pale yellow, some- 

 what thick, without bands ; spire attenuate, sharp-pointed ; sutures 

 irregularly impressed; whorls eight, slightl}' convex; aperture rather 

 large, ovately rhoraboidal, white within ; outer lip acute, sin- 



389. o ' •' 



nous; columella somewhat bent in, yellow above and white 

 below, twisted. 

 Habitat. — Tennessee; Dr. Currey and President Lindsley. 

 Diameter, -28; length, w-t of an inch. 



Observations. — This is a graceful, sharp-pointed species, 

 closely allied to Deshayesiana (nobis), but is rather more 

 slender, is a little more inflated below the sutures and is rather 

 more solid in its structure. It has the same striae along the upper 

 part of the whorls which decussate the folds. It is more ovate in 

 the aperture, the base not being so angular. The folds on the upper 

 whorls are close and well defined, but disappear below. They are 

 slightly curved, and the apei'ture is about one-third the length of the 

 shell. — Lea. 



Tlie following is a younger shell. 



Goniobasis cei-ea. — Shell folded, conical, rather thin, wax-colored, 

 without bands ; spire conical ; sutures impressed ; whorls six, some- 

 what convex, with small folds ; aperture rather large, elongately 



rhomboidal, whitish within; outer lip acute, sinuous; colu- 



1 > . Fig. 390. 



mella bent in and twisted. 



Habitat. — Tennessee; Prof. Troost : and Duck Creek, Ten- 

 nessee ; J. Clark. 



Diameter, -20 ; length, -04 of an inch. 



Observations. — Two specimens only are before me. That 

 from Mr. Clark, which I believe was collected by Prof. Chi-isty, is of 

 a lighter color than the other, which is brownish and ma}' even prove 

 to be a distinct species, as it is slimmer and is rather smaller in the 

 aperture. The folds are delicate, inclining to the right, and do not 

 reach to the body-whorl. There are indistinct strios on the upper 

 part of the whorls decussating the folds. Ifc is about the size and 

 nearly the same outline as inosculata, herein described, but that is a 

 carinate species with a somewhat differently formed aperture. The 

 aperture is more than one-fourth the length of the shell. — Lea. 



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