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



in the middle ; aperture small, regularly rhomboidal ; outer lip sharp 



and sinuous ; columella white and very much twisted ; canal short and 



effuse. 



Ifa6i!af.— Tennessee River, Alabama? Wm. SpiUman, M. D. 



Diameter, -39 ; length, -88 inch. 

 Fig. 104. 



Observations. — I have about a dozen of various ages before 



me. There is no variation in them, either in color or form, 

 but some are slightly cariuate towards the apex. None 

 have bands. The channel is short and the outer lip flat- 

 tened out, so that this species closely impinges on the auger 

 mouthed Melaniclae. None before me have the least appear- 

 ance of colored bands. It is allied to Spillmanii, herein 



described, but is a shorter shell and not so attenuate. The aperture 



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



This is evidently a young shell, but whether a distinct species 

 or not I cannot say. 



44. P. Leaii, Tuyox. 



lo viridula, Lea, Proc. Acad. Nat. Sci., p. 394, 18151. Jour. Acad. Nat. Sci., v, pt. 3, 

 p. 349, t. 39, f. 218. Obs., ix, p. 171. 



Hescription.— Shell smooth, cylindrico-conoidal, greenish; spire 

 somewhat raised ; suture slightly impressed ; whorls about nine, flat- 

 tened, obtusely angular in the middle; aperture rather 



r ig. 195. 



small, rhomboidal; outer lip sharp, sinuous; columella 

 purple at the base, slightly twisted; canal short and dilate. 



Jlabitat.— Coosa Kiver, Alabama; Wm. Spillman, M. D. 



Diameter, -40; length, -98 inch. 



Observations. — There are three adult specimens before me. 

 Neither has a perfect spire, but the upper whorls show 

 slight carination. There are a few obscure transverse striae 

 below the angle of the last whorl. The general color is of a faded 

 dark olive-green. Along the sutures the color is light. Within the 

 aperture the color is dull purple in two specimens ; in the third, there 

 are four obscure, broad bands. The aperture is a little more than 

 one-fourth the length of the shell. This species has so short a 

 channel and so dilated an outer lip, that it is little removed from the 

 group of Melanida, which has the auger-shaped aperture, and which 

 I have called Trypanostoma. — Lea. 



