PLEUROCERA. 77 



21. P. Alabamense, Lea. 



Trypanostama Alabamense, Lea, Proc. Acad. Nat. Sci., p. 171, 1832. Jour. Acad. 

 Nat. Sci., V, yt. 3, p. 288, t. 3G, f. 113. Obs., i.\, p. 110. 



Description. — Shell carinate, somewhat thick, subfusiform, dark 



horu-color ; spire somewhat attenuate ; sutures regularly impressed ; 



whorls about eight, flattened, striate below ; aperture rather small, 



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



Fig. 145. 

 mella blackened below and very much twisted. 



Habitat. — North Alabama; Prof. Tuomey : Florence, 

 Alabama; Kev. G. White. 



Diameter, -40; length, 1-11 inches. 



Observations. — This species is allied to Florencense, herein 

 described in outline, but is a much smaller species, less 

 exserted in the spire, of a much lighter color and with fewer 

 whorls. The three specimens before mc differ but little in 

 size or color, neither has a perfect apex, and therefore the character 

 or the exact number of the upper whorls cannot be ascertained. 

 They all hare a few indistinct revolving stria3 below the periphery of 

 the last whoi'l. The aperture is about one-third the length of the 

 shell. — Lea. 



Very distinct from the preceding two species in the longer 

 spire and canal. A variety Avith a light line below the sutures 

 and yellowish-brown within occurs in Powell's River, Cumber- 

 land Gap, E. Tennessee. 



21a. P. Florencense, Lea. 



Trypanostoma Florencense. Lea, Proc. Acad. Nat. Sci., p. 171, 1862. Jour. Acad. 

 Nat. Sci., V, pt. 3, p. 287, t. 3ti, f. 112. Obs., ix, p. 109. 



Description. — Shell subcarinate, turretcd, rather thick, dark brown 

 or yellowish horn-color; spire very much raised; sutures slightly 

 impressed; whorls about eleven, slightly convex; aperture rather 

 small, rhombic, within bluish-white ; outer lip acute, sinuous ; colu- 

 mella whitish and very much twisted. 



Ilabitat.— Florence, Alabama; Dr. Spillman : Tuscumbia; L. B. 

 Thornton, Esq. 



Diameter, -.'SO; length 1-05 inches. 



Observations. — This is a large, rather slim species. Among eiglit 



