BYTHINELLA. 49 



at the beaks very obtuse ; sutures impressed ; 

 whorls four, convex; aperture small, nearly 

 round." 



Alt. 2-5, diam. 1-7 mill. 



Western New York, Ohio to Illinois, Michi- 

 gan. 



This species is readily distinguished from its 

 congeners by its pupseform truncate apex. 

 Illinois specimens in the Philadelphia collec- 

 tion are rather larger than the above average 

 dimensions. 



C. West Coast Species. 



7. BYTHINELLA INTERMEDIA, Tnjon. 



Plate 16, fig. 7. 



Shell elongately turbinated, consisting of 

 over four very convex whorls ; spire elevated, 

 suture profound, apex obtuse; body whorl 

 well rounded ; aperture small, nearly round ; 

 umbilicus narrow. Color dark green. 



Alt. 5, diam. 3'3 mill. 



Owyhee River, S. E. Oregon. 



(30) 4 



