658 STEARNS 



in an imperfect condition. Upon careful comparison with the large 

 series of living shells in the National collection, the specimen, though 

 somewhat distorted by compression in the number and closeness of its 

 whorls and general facies, points directly to perspectiva of Say (Mu- 

 seum no. 13402). 



Dr. Pilsbry^ gives the range of this species, geographically, "Min- 

 nesota to Texas, east to the Atlantic, but wanting from the Middle 

 States east of the Alleghenies, and from New England to Canada." 



P. striateUa Anth., to which in a general way it bears a strong re- 

 semblance, has a widely diffused western distribution^ "Ontario to 

 Winnepeg, Manitoba, Montana, and Vancouver Island, south to New 

 Mexico and Arizona, Kern River region, California " ; while another 

 form related closely to the foregoing, cronkhitei Newcomb, has been 

 detected in Klamath Valley, Oregon, and occurs also in Nevada and 

 California. 



P. perspectiva simillhna may be the ancestral aspect of these, which 

 are represented farther to the east, by Dr. Pilsbry's "/*. striateUa cats- 

 killensis ixoxn Tannersville Valley, Catskill Mountains." 



1 In Classified Catalogue before quoted. 

 * Pilsbry's Catalogue, etc. 



