OP CONCHOLOGY. 49 



bilicus ; a long lamellar tooth on the base of the lip, and a 

 strong curved tooth on the parietal wall. Reddish horn color. 



Diam. 14, height 9 mill. 



Cherokee County, North Carolina. 



A beautiful little species, almost a pigmy elevata; the whorls 

 of the spire are not so convex, however, as they are in that 

 species. 



** Shell depressed. 

 3. Xolotrema obstricta, Say. 



Plate 9, figure 3. 



Shell depressed, acutely carinated, the carina visible on all 

 save the apical whorls of the spire ; spire depressed convex ; 

 whorls five, more convex below, covered with distant sharp 

 oblique costag, which fringe the edge of the carina in crossing it, 

 with frequently slight, close, revolving lines ; aperture trilobate, 

 lip widely reflected, parietal tooth strong, oblique, superior lip 

 tooth small, inferior lip tooth a long blade upon the base of the 

 lip ; umbilicus covered. Pale to dark brown. 



Diam. 22, height 8 mill. 



Western and Southern States. 



This species differs from the following in being always strongly 

 carinate, and in not having hispid epidermal projections. 



4. Xolotrema palliata, Say. 



Plate 9, figure 4. 



Shell depressed above, a little more convex below, with ele- 

 vated oblique ribs, the epidermis rugose, with close, minute his- 

 pid prominences ; whorls five, not very convex, subangulate to 

 carinate at the periphery ; aperture trilobate, caused by three 

 teeth, the largest of which is parietal and oblique, the others are 

 respectively on the upper and lower portions of the labrum, the 

 lower one being blade-shaped; umbilicus covered. Light to 

 dark brown. 



Diam. 23, height 10 mill. 



Alleghany Mountains and westward, Vermont, (W. G. Bin- 

 ney,) Iowa, Michigan, Kentucky, Tennessee, &c. 



4 



