330 NEW UNIONIDiE, MELANID^, ETC., 



Remarhs. — Four specimens were received from Major Downie, one of which is 

 darker and has five well developed bands, which are of a brown color and distinctly 

 marked. In outline it is closely allied to ornata, herein described, but need not be 

 confounded with that species, which differs in the aperture and other characters. 

 The reflected base at the aperture separates it from its allied species. The aperture 

 is about one-third the length of the shell. 



GoNiOBASis Gesneeii. PI. 54, fig. 5. 



Testa striata, fusiformi, tenui, tenebroso-oliva, evittata ; spira subbrevi ; suturis impressis ; anfractibus 

 instar septenis, planulatis ; apertura grandi, late ovata, intus lugubri ; labro acuto, parum sinuoso ; 

 columella purpurescente et valde contorta. 



Shell striate, fusiform, thin, dark olive, without bands; spire rather short; sutures 

 impressed ; whorls about seven, flattened; aperture large, widely ovate, dark within; 

 outer lip acute, somewhat sinuous ; columella purplish and very much twisted. 



Proc. Acad. Nat. Sci. 1868, p. 151. 

 ^ Hob. — Uchee River, Alabama, Mr. Wm. Gesner. 



My cabinet. 

 Diam. '37, Length '80 inch. 



Remarks. — A single specimen only was found among the shells sent by Mr. Gesner 

 to Dr. Lewis. It is closely allied to O. Gerhardtii (nobis) in being about the size 

 and of nearly the same outline. It is, however, without bands, is rather more 

 flattened on the whorls and more rounded at the base of the columella. On the 

 lower whorl of this specimen there are seven indistinct, rather distant striae. The 

 aperture is nearly one-half the length of the shell. 



I name this after Mr. Wm. Gesner, of Milledgeville, Geo., who has sent a number 

 of interesting species from Georgia. 



GoNioBASis Whitfieldensis.* pi. 54, fig. 6. 



Testa valde striata, subfusiformi, subcrassa, tenebrosa ; spira brevi ; suturis irregulariter impressis ; 

 anfractibus instar quinis, vix convexis ; apertura grandi, ovata, intus tenebroso-purpurea ; labro 

 subcrenulato ; columella inflexa et parum contorta. 



Shell much striate, subfusiform, somewhat thick, dark; spire short; sutures 

 irregularly impressed; whorls about five, scarcely convex; aperture large, ovate, 

 within dark purple; outer lip subcrenulate ; columella inflected and somewhat 

 twisted. 



G. tenebrosa. Proc. Acad. Nat. Sci. 1868, p. 151. 



Bob. — Connesauga Creek, Whitfield County, Georgia, Major T. C. Downie. 



My cabinet. 

 Diam. -40, Length -80 inch. 



* Changed from tenebrosa, which name is jjreoccupied. 



