142 NEW UNIONID^, MELANIDiE, ETC., 



It belono'S to the group of which Eartmanii may be considered the type, but may be 

 distinguished by its being a larger and more robust species, with a much larger body 

 whorl. The aperture is about one-third the length of the shell. 



Trtpanostoma cylindraceum. pi. 23, fig. 51. 



Testa IfBvi, eylindracea, suborassa, vittata vel evittata ; spira subelevata; suturis irregulariter impressis ; 

 anfractibus planulatis, leviter impvessis, inferne suturis tumidis ; apertura parviuscula, rhomboidea ; 

 labro acuto, aliquanto siauoso ; columella incrassata, incurvata et contorta. 



Shell smooth, cylindrical, rather thick, banded or without bands; spire rather 

 raised ; sutures irregularly impressed ; whorls flattened, slightly impressed, swollen 

 below the sutures ; aperture rather small, rhomboidal ; outer lip acute, somewhat 

 sinuous ; columella thickened, incurved and twisted. 

 Proe. Acad. Nat. Soi. 1864, p. 4. 



f[al. — Eoane County, East Tennessee, Major S. S. Lyon, U. S. E. 

 My cabinet. 

 Diam. -41, Length 1-4 inch. 



Bemarhs. — I have three specimens of this pupgeform species before me. Two of 

 them are of a light horn color ; the third has a dark brown band over more than 

 two-thirds of the whorls, above which band along the sutures it is yellow. In this 

 specimen the base of the columella is purple and the interior is purplish. In all the 

 , three specimens the body whorl is impressed above the periphery, amounting almost 

 to a channel. It is allied to parvum and moriforme, (nobis,) but is larger and more 

 cylindrical than the first, and smaller and less pyramidal than the latter. The 

 aperture is about one-third the length of the shell. The apices were too much 

 eroded to ascertain the number of whorls, but thejre are probably about eight. 



Trtpanostoma Roanense. pi. 23, fig. 52. 



Testa Iffivi, obtuso-conica, crassa, vittata vel evittata ; spira obtusa ; suturis impressis ; anfractibus planu- 

 latis, inferne suturis tumidis ; apertura parviuscula, rhomboidea ; labro acuto, sinuoso ; columella 

 albida, incrassata et valde contorta. 



Shell smooth, obtusely conical, thick, banded or without bands ; spire obtuse ; su- 

 tures impressed ; whorls flattened, swollen below the sutures ; aperture rather small, 

 rhomboidal; outer lip acute, sinuous; columella whitish, thickened and very much 

 twisted. 



Proc. Acad. Nat. Sci., 1864, p. 4. 



Ba&.— Eoane County, East Tennessee, Major S. S. Lyon, U. S. E. 

 My cabinet. 

 Diam. -41, Length -80? inch. 



