CHIEFLY OF THE UNITED STATES. 137 



Diam. -25, Length -SI inch. 



Remarhs. — This is a pretty little species which is nearly allied to Melania [Gonio- 

 basis) NicJdiniana, (nobis.) but while being nearly of the same length it is not much 

 inflated. It differs much in the color, aterina being of a black or green black color, 

 while Nickliniana is lighter and almost rubiginose, and has a larger aperture. While 

 some of the aterina are dark bottle green, they are generally black with a dark pur- 

 ple mouth. It is near to Melania {Goniobasis) adusta, Anth., but is a shorter and 

 darker species. The length of the aperture is about one-half the length of the shell. 



Goniobasis Emertensis.* PI. 23, fig. 43. 



Testa plicata, subfusiformi, subtenui, tqjiebroso-oliYa, evittata; spira obtuse conoidea; suturis irregulari- 

 ter impressis; anfractibus instar senis, planulatis, superne plicatis; apertura grandiuseula, subovata, 

 intus cfei'uleo-alba; labro acuto, leviter sinuoso; columella iuferne leviter iacrassata et contorta. 



Shell plicate, subfusiform, rather thin, dark olive, without bands ; spire obtusely 

 conical ; sutures irregularly impressed ; whorls about six, flattened, folded above ; 

 aperture rather large, subovate, bluish white within ; outer lip sharp, slightly 

 sinuous; columella slightly thickened and twisted below. 



Operculum ovate, dark brown, with polar point near to the base. 

 Proc. Acad. Nat. Sci., 1864, p. 3. 



Hab. — Rocky Creek, Head Branch of Emery River, E. Tenn. Major S. S. Lyon, 

 U. S. E. 



My cabinet. 

 Diam. -34, Length -78 inch. 



RemarTis. — In outline this species is near to histabilis and Christyl (nobis). It 

 differs from both in having no bands and in having no folds on the body whorl. 

 In the form and size of the aperture it closely resembles them both. The aperture 

 is nearly half the length of the shell. 



Goniobasis Smithsoniana. PI. 23, fig. 44. 



Testa plicata, fusiformi, tenebroso -cornea, subcrassa, mucronata, evittata; spira obtuso-conica ; suturis 

 impressis ; anfractibus instar septenis, planulatis, in medio angulatis ; apertura subgrandi, ovato- 

 rhomboidea, intus albida; labro acuto, subrecto j columella subcrassa et aliquanto contorta. 



Shell plicate, fusiform, dark horn-color, rather thick, sharp at the apex, without 

 bands; spire obtusely conical; sutures impressed; whorls about seven, flattened, 



*In my paper on New Melanidce of the United States, published in the Proceedings of the Academy in 

 1861, and more at large in the Journal, Vol. 5, and in my " Observations," Vol. 9, I used the names blanda and 

 Vanuxcmii for two new Goniohasi. Having used both names before as Melanioe, which now come under the 

 genus Goniobasis, I propose to change hlanda into versa, and Vanuxemii into Prestoniana, the former 

 Vanuxemii, having been found at Col. Preston's Salt Works in Western Virginia. 



35 



