NEW MELANIDiE OF THE UNITED STATES. 247 



seen. It is somewhat like pagoda (nobis), but is much larger, more robust and sub- 

 cylindrical. It also has more and larger ribs, which are very prominent. The 

 specimens before me have on the last whorl seven ribs, the three lower ones being 

 small, the three middle ones large, looking like cords wrapped round the shell. 

 These are of a lighter brown. Two ribs only are visible on the upper whorls. The 

 fissure in the lip is three-tenths of an inch long. The apex being eroded, I am unable 

 to describe that part, nor can I give, consequently, the number of whorls, but they 

 are likely to be seven or eight. 



SCHIZOSTOMA CASTANEUM. PI. 35, fig. 50. 



Testa carinata, conica, subcrassa, tenebroso-fusca, imperforate ; spira elevatii ; suturis valcle irnpres- 

 sis ; anfractibus senis, planulatis, carinatis, quadrivittatis ; fissurS, recta, angusta profundaque ; 

 apertura, parviuscula, elliptical, intus vittata, ad basini subrotundata ; columella alba, incrassata ; , 

 labro acuto, vix sinuato. 



Shell carinate, conical, rather thick, dark brown, imperforate ; spire exserted ; 

 sutures very much impressed ; whorls six, flattened, with a single carina and 

 four bands ; lip-cut straight, narrow and deep ; aperture rather small, elliptical, 

 banded within, rounded at the base ; columella white and thickened ; outer lip 

 acute, slightly sinuous. 



Operculum nearly round, light brown, with the polar point below the middle on 

 the inner side. 



Schisostoma castaneum, Proc. Acad. Nat. Sci., 1860, p. 186. 



Hah. — Coosa River, Alabama, E. R. Showalter, M. D. 



My cabinet and cabinet of E. R. Showalter, M. D. 

 Diam. '32, Length -64 inch. 



Remarks. — Several specimens are before me of nearly the same size. A single 

 rather obscure carina follows round the middle of the lower whorls, and is exhibited 

 on the upper whorls just above the suture with more force. The four bands are 

 obscure on the outside, but well defined on the inside. One specimen has but three 

 bands, and another has very pale bands. The impression made by the lip-cut is well 

 defined and forms a narrow hem-like line below the suture. The aperture is rather 

 small, not being quite half the length of the shell, and is rounded at the base. It is 

 nearest in outline to pagoda (nobis), but may at once be distinguished by the color 

 being usually darker, by being less carinate, in having a deeper lip-cut, and in being 

 rounded at the base, instead of being angular there, as that species is. The aperture 

 is rather more than one-third the length of the shell. 



Schizostoma Hartmanii. PI. 35, fig. 51. 



Testa leevi subcylindracea, crassa, luteo-cornea, imperforata ; spira elevata ; suturis valde irupressis; an- 

 fractibus planulatis. ultimo subgrandi ; fissura recta subbrevisque ; apertura parviuscula, ovata. intus 



