GONIOBASIS. 253 



146. G. Potosiensis, Lea. 



Melanin Potosiensis, Lea, Philos. Proc, ii, p. 14, Feb., 1841. Philos. Trans., viii, 

 p. 184, t. 0, f. 45. Obs., iii, p. 22. DeKay, Moll. N. Y., p. 99. WiiEATLEY, Cat. 

 Shells U..S., p. 26. Bixxey, Check List, No. 21.'). Catlow, Conch. Nomenc, p. 

 188. Brot, List, p. 36. Reeve, Monog. Melania, sp. 295. 



Elimia Potosiensis, Lea, H. aud A. Adams, Genera, i, p. 300. 



Description. — Shell carinate, conical, rather thin, brown; spire ob- 

 tusely elevated; sutures much impressed; whorls eight, convex; 

 aperture large, ovate, purplish. 



Habitat. — Potosi, Missouri. 



Diameter, '28 ; length, '62 of an inch. 



Observatio7is. — The rotundity of the outer lip in this is different 

 from the species generally, with the same elevation of spire. Fig. 492. 

 The aperture is more than one-third the length of the shell, 

 and is entirely purple, in the only two specimens before me. 

 In one specimen the carina is distinct on all the whorls but the 

 last ; in the other it is not visible on the last two whorls. — Lea. 



Were it not for the wide difference of locality I should sus- 

 pect this to be identical with simplex. I have not seen speci- 

 mens, but the figure and description are certainly very close to 

 that species. 



147. G. Saflfordi, Lea. 



Melania Saffordi, Lea, Philos. Trans., x, p. 300, t. 30, f . 10. Obs., v, p. 56. Binney, 

 Check Li.-t, No. 23G. Bkot, Li.'^t, p. 38. IIeeve, Monog. Melania, sp. 365. 



Melania virens, Anthony, Ann. N. Y. Lye. Nat. Hist., vi, p. 93, t. 2, f. 11, March, 

 1854. Binney, Clieck List, No. 289. Buox, List, p. 40. 



Descriptio7i. — Shell smooth, obtusely conical, thick, subfusiform, 

 dark green ; spire rather short : sutures linear ; whorls a little con- 

 Fiff 493 ^'*^^' ^^^^ ^^^^ large ; aperture rather large, ovately elongated, 

 within purple; columella purple and twisted. 

 Habitat. — Lebanon, Wilson County, Tennessee, 

 Diameter, -ST; length, -85 of an inch. 

 Observations. — This is a very distinct species, with a not 

 uncommon form. The green color is unusual. On the upper 

 part of the whorl, and on the line of the suture there is a 

 light or brownish band. The body- whorl is rather suddenly enlarged 

 in the middle, which gives it a slight gibbous' appearance, and it is 

 irregularly, transversely striate. The apex of each of the three spec- 

 imens under my examination being eroded, the number of whorls 



