GONIOBASIS. 337 



Habitat. — Coosa River, Alabama; E. R. Showalter, M.D. 



Diameter, -35; leugtli, -08 of au inch. 



Observations. — This species is verj' uearly allied to Melania {Gonio- 

 basis) Vanitxemiana (nobis), having coarse striiB over the whole of 

 the whorls. But it is smaller, rather more elliptical, and has Fig.64.5. 

 more striaj, the number being about ten. These stria) are 

 rounded, with an intervening groove, and cover the whole 

 of the whorls. The bands are obscure on the outside of both 

 the specimens before me, but are well defined inside. It has 

 some resemblance to Melania {Goniobasis) Coosaensis (nobis), but is 

 a much smaller species, and is more constricted in the whorls and in 

 the aperture. The aperture is nearly half the length of the shell. — Lea. 



253. G. impressa, Lka. 



Melania impressa, Lea, Philos. Proc, ii, p. 83, Oct., 1841. Philos. Trans., ix, p. 19. 



Obs., iv, p. 19. Wheatley, Cat. Shells U. S., p. 25. Jay, Cat. Shells, p. 274. 



BiNNEY, Check List, Xo. U3. Brot, List, p. 32. Reeve, Mouog. Melania, sp. 



316, 319. Haxley, Conch. Miscel. Melania, t. 8, f. 09. 

 Megara impressa. Lea, Chenu, Manuel, i, f. 2023. Adams, Genera, i, p. 306. 

 Melania crehristriata, Lea, Philos. Proc, iv, p. 106. Philos. Trans., x, p. 05, t. 9, 



f. 47. Obs., iv, p. 65. Binxey, Check List, No. 75. Catlow, Conch. Nomenc, 



p. 186. Brot, List, p. 32. 

 Megara crcbristriata, Lea, ADAMS, Genera, i, p. 306. 



Description. — Shell transversely and thickly sulcate, fusiform, thick, 

 reddish-brown ; spire obtuse ; sutures impressed ; whorls six, flat- 

 tened; aperture elliptical, rather large, angular at the 

 base, within white. 

 Habitat, — Coosa River, Alabama. 

 Diameter, -48 ; length, "81 of an inch. 

 Observations. — Dr. Griffith received a single specimen 

 only of this singularly marked species, and this is not 

 entirely perfect at the spire or aperture. The whole 

 surface of this specimen is covered with very minute, 

 impressed, revolving lines, the body-whorl having twenty-four. They 

 arc nearly equidistant and very regular. Its aperture is nearly one- 

 half the length of the shell. On the superior part of the columella, 

 there is quite a large callus.* In form and size, it closely resembles 

 the M. robusta herein described. — Lea. 



IVIy two figures represent an adult and immature specimen. 



• Other specimens, subsequently received, confirm nearly all the other characters. 

 L. F. w. F. IV. 22 



