[48 ] 



5. PsEUDOHTALiNA, Morse. Shell minute, discoidal, slight- 

 ly convex above, uuicolored, closely striate or ribbed ; 

 umbilicus large. 



Distinguished from Patula by the minute size and more 

 moderate umbilicus. 



ANGUISPIEA, Morse. 

 a. Not carinate, sometimes slightly angulate on the periphery. 

 1. Anguispira solitaria, Say. 



Plate 4, figure 46. 



Globose, thick, coarsely striate ; spire turbinately elevated, 

 apex obtuse, suture distinctly impressed; whorls 6, well 

 rounded; body large, well rounded, beneath very convex; 

 aperture sub-circular, the extremities of the lip approaching 

 upon the body ; umbilicus large, deep, exhibiting all the volu- 

 tions. Dark corneous, with (generally two) rufous revolving 

 bands ; sometimes nearly white and without bands. 



Diam. 25, height 16 mill. 



Ohio to Nebraska, and south to Ohio Eiver. 



2. Anguispira Idahoensis, Newcomb. 



Plate 4, figure 54. 



Turbinately conic, ashy horn-color; apex obtuse; whorls 

 5, very convex, the first nearly smooth, the others strongly 

 transversely ribbed, ribs on last whorl numbering 20 — 26; 

 aperture circular, very oblique; deeply and moderately um 

 bilicate. 



Diam. 13, altitude 11 mill. 



Idaho Territory. 



Distinguished from all the other species by its more conical 

 form, and sharp, distinct, distant ribs. 



3. Anguispira Cooperii, "W. G. Binney. 



Plate 4, figure 53, 

 Globosely elevated, solid, obliquely roughly striated, inter- 

 sected by delicate, spiral lines; spire elevated, obtuse, suture 

 deeply impressed ; whorls 5, convex ; body very convex, de- 

 flected at the aperture ; aperture very oblique, circular, extrem 



