122 LAND AND FRESn-WATER SHELLS OF N. A. [PART IV. 



Observations. — Of eight specimens received from Dr. Spillman, three 

 of them had transverse striae on the periphery of the whorls reaching 

 to the last whorl, on which two raised striae are noticeable. In gen- 

 eral outline and size it is near to jiarvum, herein described, but differs 

 in being flatter on the whorls, in the bands being more distant, and in 

 having a less twisted columella. It reminds one of M. gracilis, Anth., 

 but has many distinctive characters. The aperture is about one-third 

 the length of the shell. — Lea. 



The figure is copied from Mr. Lea's plate. 



64. P. altipetum, Anthony. 



Melania altipeta, Anthont, Ann. N. Y. Lye, vi, p. 87, t. 2, f. 5. Binxet, Check 

 List, No. 443. Bkot, List, p. 34. Reeve, Monog. Mel., sp. 2S0. 



Trypanostoma corneum, Lea, Proc. Acad. Nat. Sci., p. 112, 18G4. Jour. Acad. Nat. 

 Sol., vi, p. 148, t. 23, f. C3, 1SG7. 



Description. — Shell conical, smooth, horn-colored, thick; spire ele- 

 vated; whorls about ten, small, convex, the upper ones carinate, or 



only striate ; sutures distinctly impressed ; aperture small, 

 231 



elliptical, banded within; a small but distinct sinus, 



with an acute termination at base. 



Habitat. — Eaccoou Creek, Vinton County, Ohio. 

 Diameter, -24: inch (G millim.) ; length, -02 inch (16 

 millim.). Length of aperture, -21 inch (5 millim.) ; 

 breadth of aperture, '10 inch (2i millim.). 



Observations. — A very graceful, rather slender species, 

 with somewhat of a club-shaped form by its bulbous 

 body-whorl. Two specimens only are before me; one has a narrow 

 band at the base of the body-whorl ; the other has an additional band 

 on the penultimate, faintly indicated also on the upper whorls of the 

 spire. 



It may be compared with M. conica, Say, but is moi*e elevated, the 

 whorls are more narrow and crowded, as Avell as more numerous than 

 in that species, and the aperture much smaller, being only about one- 

 fourth the length of the shell. 



From 31. neglecta it differs by its more slender form, smaller and 

 more condensed Avhorls, and by its entirely different apertui'e. The 

 apical whorls seem to be slightly folded. — Anthony. 



This species is almost entitled to a place in the striate divis- 

 ion of Pleurocerce, the lines being generally crowded on all 



