PLEUROCERA. 71 



14. P. Pybasii, Lea. 



Trypinostoma Pybasii. Lea, Proc. Acail. Nat. Sni., p. 172, 1832. Jour. Acad. Nat 

 Sci., V, pt. 3, p. 2S9, t. 3G, f. 115. Obs., ix. p. 111. 



Description. — Shell obtusely cariuate, obtusely conical, solid, double- 

 banded, greonisb-brown ; spire obtuse ; sutures much impressed ; 

 whorls about eight, slightly convex; aperture small, rhombic, white 

 and banded within ; outer lip acute and very sinuous ; colu- 

 mella thickened below and very much twisted. 



Habitat. — Tuscumbia, Alabama; B. Pybas. 



Diameter, -46; length, 1-05 inches. 



Observations. — Quite a number of specimens were sent 

 by Mr. Pybas, which are all very nearly alike. Some are 

 darker than others. The angle on the periphery of the 

 whorls is obtuse, and in many specimens obsolete. The 

 lower whorl is usually flattened, sometimes impressed, making quite a 

 channel. It is near to T. moriforme herein described, but is not so 

 turgid, is of a darker color and has usually two dark bands inside ; 

 moriforme usually has a thin band but sometimes none. Tlie length 

 of the aperture is not quite one- third the length of the shell. I name 

 this after Mr. B. Pybas, to whom I am indebted for it and many fine 

 species from this vicinity. — Lea. 



15. P. Showalterii, Lea. 



Trypanoatoma Shotoalterii. Lea, Proc. Acad. Nat. Sci., p. 172, 1832. Jour. Acad. 

 Nat. Sci., V, pt. 3, p. 293, t. 3U, f. 122. Obs., ix, p. 115. 



Description. — Shell striate, sometimes smooth, much drawn out, 

 subcylindrical, thick, horn-color or brown, sometimes banded below ; 

 spire much raised ; sutures much impressed; whorls nine, somewhat 

 flattened ; aperture small, rhomboidal, whitish or salmon-color within ; 

 outer lip sharp, somewhat sinuous; columella thickened below and 

 very much twisted. 



Operculum ovate, dark brown, with the polar point near to the 

 base. 



Habitat. — Cahawba River, Alabama; Dr. E. R. Showalter: Tus- 

 caloosa, Alabama; Dr. Budd : Oostcnaula River, Georgia; Rev. G. 

 White and Bishop Elliott. 



Diameter, -40; length, 1-38 inches. 



