1909.] 



NATURAL SCIENCES OF PHILADELPHIA. 



495 



MOLLUSCA OF THE SOUTHWESTERN STATES, III: THE HUACHUCA 



MOUNTAINS, ARIZONA. 



BY HENRY A. PILSBRY and JAMES H. FERRISS. 



The Huachuca Mountains stand in the southwest angle of Cochise 

 county, Arizona, their southern foothills reaching over the international 

 boundary. The highest summits do not quite attain 10,000 feet. 

 Northward the Whetstone range looms up, a fine if arid mountain 

 mass, as yet unexplored for shells. On every side lies the desert, 

 barren of molluscan life. Our purpose is to give an account, incom- 

 plete as it now may be, of the molluscan life of this range. 1 



The Huachucas have not yet been accurately mapped. The sketch 



O Fort Huachuca 



' Tanner. Canon 



Brown Can'oni 



RAMiEr Canon 

 Cars Canon 



rvrezUMA Canon 



Fig. 1. Sketch-map of Huachuca Mountains. 



1 A few new records are added of species taken in river drift at Benson, Cochise 

 county, some distance northward from the Huachuca range. These forms 

 were derived from some other district. Other records from Benson may be 

 found in our Mollusca of the Southwestern States, II, 1906, and in Dall, Proc, U S 

 Nat. Mus., XIX, 1896. 



