PLEUROCERA. 117 



outliue and color, it is very closely allied to a shell I described, from 

 Tennessee, under the name of tenebrosa. It differs from it in having 

 the aperture less distended, in having an angle on the middle „. „„, 



f 7 o o Fig. 221. 



of the -whorl and in being more fusiform. The apex being 

 eroded, the number of whorls cannot be ascertained; there 

 are about seven. The aperture is nearly one-half the length of 

 the shell. The bands are so broad and dark as to give, in this 

 specimen, a black appearance to the whole shell, except at the 

 termination of the whorl, where the outer lip is yellow. — Lea. 



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

 does not represent this species. 



57 b. P. abruptum, Lea. ' 



Melania dbrupta, Lea, Philos. Proc, iv, p. 1G5. Philos. Trans., x, p. 59, t. 9, f. 32. 



Obs. iv, p. 59, t. 9. f. 32. Binxey, Check List, No. 2. Brot, List, p. 37. 



Reeve, Monog. ilelania, sp. 397. 

 Leptoxis abritpta, Lea, Adams, Genera, i, p. 307. 



Description. — Shell smooth, short, conical, rather thick, yellowish; 

 spire very short; sutures linear, whorls seven, flattened; aperture 

 large, ovate, within whitish. 

 ■B.- ooo Habitat. — Alabama. 



Diameter, -3; length, -04 of an Inch. 



Observations. — This species in size and form is somewhat 

 allied to 31. Nickliniana (nobis), but has the spire more ele- 

 vated and is not reddish. The two specimens before me, 

 have each two purple bands. This character may be frequent 

 without being constant. The aperture is nearly half the length of the 

 shell. — Lea. 



Figured from Mr. Lea's plate. 



57 c. P. tortum, Lea. 



Melania torta, Lea, Philos. Proc. iv, p. 16.'), Aug., 1845. Philos. Trans., x, p. 158, t. 

 9, f. 30. Obs. iv, p. 58. Binnev, Check List, Ko. 272. Brot, List, p. 39. 

 REE^'E, Monog. Melania, sp. 377. 



Description. — Shell smooth, club-shaped, rather thick, dark brown; 

 spire obtuse ; sutures impressed ; whorls convex ; aperture large, 

 elliptical; columella twisted. 



Habitat. — Big Creek, Lawrence County, Tennessee. 



Diameter, -30; length, '73 of an inch. 



