PROCEEDINaS 



OF THE 



UNITED STATES NATIONAL MUSEUM. 



Volume XVIII. 



1895. 



DIAGNOSES OF NEW MOLLUSKS FEOM THE SUPvVEY OF 

 THE MEXICAN BOUNDARY. 



By W. H. Dall, 



Honorary Curator of the Dejiartment of Molhisls. 



The luternatioual Boimdary Commission for the survey of the line 

 between tlie United States and Mexico was accompanied by Dr. Edgar 

 A. Mearns, U. S. A., who, with his associates, collected objects of natu- 

 ral history both along the line and from the ocean near its western ter- 

 minus. A full report on the mollusks has been prepared by the writer, 

 with suitable illustrations, but as this may be some time delayed in pub- 

 lication, waiting for the completion of other reports, the following diag- 

 noses of new forms have been prepared. 



Family HELICID.F. 



PATULA STRIGOSA, Gould, var. CONCENTRATA, Dall. 



Shell exactly mimicking the normal P. strigosa, with rounded whorls, 

 but measuring only 13 mm. in minor and 16 mm. in major diameter, with 

 a height of 8 mm. 



Summits of the Hacliita Grande and Iluachuca Mountains, abundant. 



EPIPHRAGMOPHORA ARIZONENSIS, new species 



Shell small, moderately elevated; light brown, with a narrow brown 

 band just above the periphery, mostly concealed by the suture, but visi- 

 ble internally in the aperture on the outer side; whorls four and a half, 

 of which one and a half are nepionic and punctate, the remainder with 



Procecdhijis of the United States Xational Miiseiuu, Vol. XVIII— No. 1033. 



Proc. N. M. 95 1 



