354 NEW MELANIDyE OF THE UNITED STATES. 



Genus LITHASIA. 



LlTlIASlA VITTATA. PI. 39, fig. 226. 



Testa lnsvi, cylindracca, subtenui, tencbroso-cornea, quadrivittata ; spira brcvi, decollate ; suturis irregu- 

 lariter imprcssis ; anfractibus planulatis, ultimo pergrandi ; apertura grandi, subrhomboidea, intus 

 albida et valde vittata ; labro acuto ; columella incrassata, alba, ineurva. 



Shell smooth, cylindrical, rather thin, dark horn-color, four-banded ; spire short, 

 decollate ; sutures irregularly impressed ; whorls flattened, the last very large ; aper- 

 ture large, rhomboidal, whitish within and much banded ; outer lip acute ; columella 

 thickened, white, incurved. 



Operculum ovate, thin, light brown, with the polar point on the inner edge near 

 to the base. 



Proc. Acad. Nat. Sci., 1862, p. 273. 



Hob. — Coosa and Cahawba Rivers, Alabama, E. R. Showalter, M. D. 



My cabinet and cabinets of Dr. Showalter and Dr. Lewis. 

 Diam, -40. Length -88 ? inch. 



Remarks. — This is a beautifully banded species, which is so near to brevis (nobis) 

 in size and outline that I considered it at first as a strongly marked variety of that 

 species. From examination now of about a dozen specimens before me, sent by Dr. 

 Showalter and Dr. Lewis, I am perfectly satisfied that this is a distinct species. All 

 the specimens I have seen have four well expressed dark brown bands, which are 

 strongly exhibited within. All the specimens are so much worn at the apex that 

 it is impossible to say how many whorls they naturally have. There is a great 

 difference in the form of the apertures of the specimens before me, — some have 

 quite an angular base, while others are rounded almost like a Melania. The 

 aperture is probably two-thirds the length of the shell. 



Lithasia Downiei. PL 39, fig. 227. 



Testa parum nodulosa, subcylindracea. castanea; spira obtuse conoideft, subelevata ; suturis irregulariter 

 impressis ; anfractibus septenis, planulatis, ultimo subgrandi ; apertura subgrandi, rliomboidea, 

 intus vel albida vel vittata ; labro acuto, sinuoso ; columella alba et ineurva. 



Shell sparsely nodulous, subcylindrical, chestnut colored ; spire obtusely conoidal, 

 somewhat raised ; sutures irregularly impressed ; whorls seven, flattened, the last 

 rather large ; aperture rather large, rhomboidal, white or banded within ; outer 

 lip sharp, sinuous ; columella white and incurved. 

 Proc. Acad. Nat. Sci., 1862, p. 273. 



Hah. — Cumberland River, Major T. C. Downie. 



My cabinet and cabinet of Major Downie. 



