CHIEFLY OF THE UNITED STATES. 337 



EemarJcs. — A single specimen only is before me, and it appears not to be entirely 

 mature. It has some resemblance to a young robusta (nobis), but it is a more slender 

 shell and has a small carina above the middle of the whorl. Below this carina there 

 are two or three rather indistinct striaa. It has a very graceful form and polished 

 surface. The aperture is not quite one-third the length of the shell. 



GONIOBASIS ORNATA. PI. 54, fig. 18. 



Testa earinata, subturrita, tenui, olivacea, valde vittata ; spira elevata, superne plicata ; suturis valde 

 impressis ; anfractibus septenis, planulatis ; apertura parviuscula, subrhomboidea, intus vittata ; 

 labro acuto, aliquanto sinuoso ; columella vix incrassata et valde contorta.. 



Shell carinate, somewhat turrited, thin, olivaceous, very much banded ; spire 

 elevated, plicate above; sutures very much impressed; whorls seven, flattened; 

 aperture rather small, subrhomboidal, banded within ; outer lip acute, somewhat 

 sinuous ; columella scarcely thickened and very much twisted. 

 Proc. Acad. Nat. Sci. 1868, p. 152. 



Bab. — Connesauga Creek, Whitfield Co., Geo., Major T, C. Downie. 



My cabinet. 

 Diam. -36, Length -84 inch. 



Eemarl's. — Five specimens are before me, only one being mature. It is a pretty 

 species, with a varying number of bands, which are very distinct within the 

 aperture, there being four, five or six in those before me. The upper whorls are 

 indistinctly plicate. It belongs to the group of which Gerhardiii (nobis) may be 

 considered to be the type. It differs from it in being less robust, in being carinate 

 and being a smaller species. It has some resemblance to mutahilis (nobis), which is 

 sometimes carinate and plicate, but it differs much in the aperture of that shell. The 

 aperture is quite one-third the length of the shell, 



Trypanostoma nuciforme. pi. 54, fig. 19, 



Testa laevi, obtuse conica, inflata, crassiuscula, castanea ; spira brevi, obtusa ; suturis regulariter 

 impressis ; anfractibus instar quinis, convexiusculis ; apertura magna, rhomboidea ; labro acuto, 

 expanse, sinuoso ; columella inflexa et valde tortuosa. 



Shell smooth, obtusely conical, inflated, slightly thickened, chestnut-colored ; 

 spire short, obtuse; sutures regularly impressed; whorls about five, a little convex; 

 aperture large, rhomboidal ; outer lip acute, expanded and sinuous; columella 

 inflected and very much twisted. 



Proc. Acad. Nat. Sci. 1868, p. 152. 



Eab. — Connesauga Creek, Whitfield Co., Geo., Major T. C. Downie. 



My cabinet. 

 Diam. -34, Length -59 inch. 



