282 NEW MELANID^E OF THE UNITED STATES. 



brown bands. It is closely allied to Vanuxernii, herein described, from South Carolina, 

 but differs in having a larger aperture and a higher spire. The aperture is about one- 

 third the length of the shell. 



Trypanostoma teivittatum. PI. 36, fig. 102. 



Testii lsevi, subi'usiformi, subtcnui, nitida, olivacea, fcrivittata ; spira cornea, nmcronata, ad apicein 

 carinata; suturis linearibus ; anfractibus octonis, planulatis, ultimo subgrandi; apertura subgrandi, 

 rliomboidea, intiis vittata ; labro acuto, sinuoso ; columella paruni incrassata ct incurva. 



Shell smooth, subfusiform, rather thin, shining, olivaceous, three-banded ; spire 

 conical, pointed, carinate at the apex; sutures line-like; whorls eight, flattened, the 

 last one being large ; aperture rather large, rhombic, banded within ; outer lip acute, 

 sinuous ; columella slightly thickened and incurved. 



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

 Proc. Acad. Nat. Sci., 1862. p. 175. 



Hab. — Tombigbee River, Mississippi, Wm. Spillman, M. D. 



My cabinet and cabinets of Dr. Spillman and Dr. Hartman. 

 Diam. -39, Length -78 inch. 



RemarJis. — I have examined about twenty specimens of this species and find them 

 differing very slightly. Every one has three bands, the two lower of which are more 

 distinct on the outside than the upper one, while inside they are well defined and 

 much alike. Three of the specimens are very dark, almost purple, but the bands are 

 distinguishable inside. There is a white line immediately below the sutures. In 

 some specimens there is a disposition to be somewhat angular on the periphery, below 

 which there are transverse stride in some individuals. The aperture is about three- 

 eighths the length of the shell. 



Trypanostoma trochulus. PI. 36, fig. 103. 



Testa laevi, trocliiformi, valcle tumida,; lutea, infra unifasciata ; spira valde obtusa; suturis inrpressis; an- 

 i'ractibus senis, superne planulatis, inferne inflatis; apertura grandi, rliomboidea, albida et uni- 

 l'asciata, ; labro acuto, sinuoso ; columella, inferne incrassata et valde contorta. 



Shell smooth, top-shaped, very much swollen, yellow, single banded below ; spire 

 very obtuse ; sutures impressed ; whorls six, flattened above and inflated below ; aper- 

 ture large, rhomboidal, whitish and single-banded within ; outer lip acute, sinuous ; 

 columella thickened below and very much twisted. 

 Proc. Acad. Nat. Sci." 1862, p. 175. 



Hab. — Holston River, Tennessee. Prof. G. Troost. 



My cabinet. 

 Diam. -37, Length -49 inch. 



Remarks. — A single specimen of this pretty little species was received from Prof. 

 Troost, a long time since, with Meiania turgida (nobis), but it is a very different 



