306 AMERICAN JOURNAL 



20. P. Alabamense, Lea. Fig. 49. Subfusiform, rather 

 thick, carinate; spire somewhat attenuate ; whorls 8, flattened, 

 the last subangulate on the periphery, and striate below; 

 aperture rather small. Dark horn-color. Florence^ Ala.; 

 PowelVs River ^ Tenn. 



Very distinct from Nos. 18 and 19 in the longer spire and canal. 



21. P. Florencense, Lea. Fig. 50. Turrited, sub-carinate, 

 rather thick; spire much elevated; suture slightly impressed; 

 whorls 11, slightly convex, a little angulated on the periphery. 

 Dark brown or yellowish horn-color, white or salmon-color 

 within. New Harmony^ Lnd.; N. Ala. 



No. 20 may prove to be the young of this species. 



21a. P. olivaceum, Lea. Fig. 51. Conical, sub-carinate 

 above, rather thick ; spire rather obtuse ; suture impressed ; 

 whorls 8, flattened, the last large, with a raised line on the 

 periphery, the base convex ; aperture large, outer lip sinuous. 

 Olive-green. Tombighee River ^ Miss. 



22. P. canalitium, Lea. Fig. 52. Conical, canaliculate, 

 rather thick ; spire regularly conical, somewhat raised ; suture 

 impressed ; whorls 7, flattened, the last canaliculate in the 

 middle; aperture small, outer lip sigmoid. Horn-color, three- 

 banded, white or salmon within. Yellow Leaf Creek^ Ala.; 

 Columbus, Miss. 



23. P. Clarkii, Lea. Figs. 53, 54. Conical, obtuse, sub- 

 carinate, rather thick ; spire raised ; suture impressed ; whorls 

 8, flattened, the last rounded, with a raised line on the pe- 

 riphery ; aperture small, outer lip sinuous. Dark olive, 

 horn-color or deep purple. Tenn., North and Middle Ala. and 

 Miss. 



A common species, doubtfully distinct from canalitium ; it appears to 

 be rather broader, with a better developed carina and recurved canal, 



24. P. Anthonyi, Lea. Fig. 55. Pyramidal, thick, ru- 

 gosely striate ; spire raised ; suture rugosely impressed ; whorls 

 y, flattened, the last large, rounded, with three or four raised 

 lines on and above the periphery. Yellowish-olive. Tenn.^ 

 Ala. 



Differs from canaliculatum in the absence of a distinct carina and sulca- 

 tion, the raised lines taking their place ; the base also is longer and the 

 fuse more obtuse and wider. 



25. P. prasinatum, Conr. Figs. 66 — 58. Conical, sub- 

 ulate, smooth, solid; spire pyramidal, suture regularly im- 

 pressed ; whorls 9, slightly convex, the last sometimes a little 

 channelled in the middle; aperture small, rhombic, narrowly 

 channelled below. Greenish or reddish-brown, with or with- 

 out 2 bands, white or salmon-color within. Knoxville, Tenn.; 

 N. Ala. 



Fig. 56 is from the type, not fully grown, Fig. 57 is Eartmanii, Lea, and 

 Fig. 58 Jayi^ Lea. 



