62 THE NAUTILUS. 



The oreneral region in which Columbia is situated remains to be 



O O 



explored ; it has been barely glanced at. Though the occurrence of 

 circumcarinata thereabouts has not been verified by subsequent col- 

 lectors, its non-occurrence there cannot safely be assumed upon the 

 ground of extreme remoteness from the Montana region explored l.y 

 Professor Elrod, when we have the more extraordinary fact in the 

 matter of distribution, exhibited by the occurrence of Pyramidula 

 hemphiUi Newc. (heretofore credited to Arizona, Nevada, Idaho, 

 Utah and Colorado), on Catalina Island, twenty-five miles distant 

 from the mainland of southern California, where Mr. Hemphill, 

 some months ago, collected numerous living examples, fifty or more, 

 which he kindly showed me. 



Here is a conundrum in geographical distribution, of great interest 

 and certainly "a hard nut to crack." 



Hemphill's original find of this peculiar form was in the White 

 Pine mining district, extreme eastern Nevada. 



A few years ago the distribution of Yallonia pulchella 1 was given 

 as "Montana eastward, from Canada to, or nearly to the Gulf of 

 Mexico. Europe." In September, 1900, it appeared suddenly 

 upon my grounds in Los Angeles and continued to be abundant for 

 some months ; it is now scarce. Whence it came and whither it is 

 going, who can tell ? 



Los Angeks, Gal, August 26, 1902, 



PYRAMIDULA" ELRODI AND EPIPHRAGMOPHORA 

 CIRCUMCARINATA. 



BY H. A. PILSBRY. 



Dr. Stearns, having expressed the opinion that the two Helices 

 named above are specifically identical, I have again compared them, 

 and find my previous idea of their distinctness confirmed. My 

 material consists of the types and numerous other specimens of P. 

 elrodi and two specimens of E. circumcarinata, an adult and a 

 young one, received from Dr. Stearns years ago, about the time the 

 species was described. The difference between Dr. Stearns' views 

 and my own, of the affinities of the two Helices, may be due to his 



'See THE NAUTILUS for October, 1900. 



