NEW MELANIDiE OF THE UNITED STATES. 331 



Shell carinate, fusiform, rather thin, shining, dark, nearly black, three-banded ; 

 spire conical, sutures impressed ; whorls about six, flattened above, the last one large ; 

 aperture rather large, rhomboidal, whitish or brown, and three-banded within ; outer 

 lip acute, slightly sinuous ; columella bent in, slightly thickened below. 

 Proc. Acad. Nat. Sci., 1862, p. 270. 



Hah. — Georgia, Rev. G. White, Coosa River, Alabama, Dr. Spillman. 



My cabinet and cabinets of Mr. White and Dr. Spillman. 

 Diam. -37, Length -82 inch. 



Remarks. — A single specimen only from each of the habitats was received. That 

 from Mr. White is the larger and is not so dark, the epidermis being olive-brown, and 

 the interior being whitish with the three bands well-defined. That from Dr. Spill- 

 man is of so dark a brown, that it has the appearance of being entirely black, but in 

 the inside, the three bands may be distinguished, but the exterior is totally and in- 

 tensely dark. In outline it is nearly the same with Gerhardtii, herein described, but 

 differs in the number and character of the bands. The aperture is not quite half the 

 length of the shell. 



GONIOBASIS MUTABILIS. PI. 38, fig. 189. 



Testa carinata vel plicata vel striata, subfusiformi, subcrassa, lutco-virente, quadrivittata vel evittata ; 

 spira obtuse conoida ; a nfractibus senis, planiusculis ; apertura subgrandi, rbomboideii , intiis albida ; 

 labro acuto, vix sinuoso ; columella incurva, incrassata, paruin contorta,. 



Shell carinate, plicate or striate, subfusiform, somewhat thick, yellowish-green, four- 

 banded, or without bands ; spire obtusely conical ; whorls six, slightly flattened ; ap- 

 erture rather large, rhomboidal, whitish within ; outer lip acute, scarcely sinuous ; 

 columella bent in, thickened, somewhat twisted. 



Operculum ovate, thin, dark-brown, with the polar point well removed from the left 

 margin. 



Proc. Acad. Nat. Sci., 1862, p. 270. 



Hah. — Butts County, Georgia, Rev. G. White. 



My cabinet and cabinets of Mr. White and Dr. Hartman. 

 Diam. "31, Length *65 inch. 



Remarks. — This is a most variable species, most are carinate, but many are striate, 

 and some are plicate, and on a few neither of these characters can be observed, the 

 surface being entirely smooth. All are disposed to carination on the apicial whorls. 

 Many are without bands, but most are four-banded, having the two medial bands ap- 

 proximate. All were more or less covered with the black oxide of iron. In outline 

 it is nearly allied to Melanin ( Goniohasis) Leeontiana (nobis), but it is not so fusiform, 

 nor so large, nor is it always plicate, as that species is. Some of the specimens are en- 

 tirely white inside, and thickened, but usually they are four-banded. In several 



