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.’ 
The Huachucas have not yet been accurately mapped. The sketch 
\\/ 
Z “ny, oes 
Ramsey Canon 
CarRR CANON 
CarRrR 
K MitteR Canon 
iccen PEAK 
pA Canon 
Ss 
SA 
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, I1, 1906, and in Dall, Proc. U.S, 
Nat. Mus., XIX, 1896. 
