1923] NATURAL SCIENCES OF PHILADELPHIA 61 
Thysanophora hornit (Gabb). Stations 149, 150. 
Holospira whetstonensis P. & F., small form. Station 149. 
Polita indentata umbilicata (Ckll.) Stations 150, 150 
Chaenaxis tuba (Pils.). Station 149. 
Chaenaxis intuscostata (Clapp). Station 150. 
- Gastrocopta perversa (Sterki). Station 149. 
THE WHETSTONE Mountarns form a short range on the boundary 
between Pima and Cochise counties, north of the Huachucas, 
connected therewith by the 4500 ft. contour. The highest peak 
reaches 7684 ft. The range forms part of the Coronado Forest 
Reserve, and is mapped on the Benson Quadrangle, U. S. G. S. 
topographic maps. 
A brief visit was made by one of us (J. H. F.) in 1914, and a few 
shells of Sonorella cotis were obtained. In the spring of 1919, 
with A. A. Hinkley, two trips were made from our Huachuca camp 
without finding a shell. On the third trip, a long slide facing east 
was discovered,? containing many dead Sonorellas. Shells were 
subsequently found in the following stations: 
Sonorella cotis P.& F. Stations 3 (1914), 293, 304, 304% (1919). 
Sonorella insignis P. & F. Stations 304, 30414, 305. 
ata concentrata huachucana (Pils.). Stations 286, 303, 304, 
Holoepir whetstonensis P. & F. Stations 293, 304, 305. 
Gastrocopta ashmuni (Sterki). Station 293. 
Gastrocopta a. minor (Sterki). Station 303. 
Gastrocopta dalliana (Sterki). Stations 303, 293. 
Gastrocopta pilsbryana (Sterki). Station 293. 
Gastrocopta pellucida hordeacella (Pils.) Stations 293, 303. 
Vallonia perspectiva Sterki. Station 303. 
The Mustang Mounrtarns are a small group, only about 4 miles 
long, between the Huachucas and Whetstones, within the eastern 
border of Pima Co. The highest peak is 6315 ft. elevation. 
Mapped on the Benson Quadrangle. The prevalence of limestone 
makes these mountains particularly favorable for Holospira. 
First visited by J. H. F. in 1918, going down from the Empire 
Range. Across a beautiful prairie country settled up by dry 
farmers, twenty miles or more southeast the highway to Patagonia 
and Fort Huachuca passes between the Whetstone and the Mustang 
Mountains. Here was limestone again in both ranges. Sonorellas 
and Holospiras were plentiful at the Dome of the Mustangs (Sta- 
2 Nautilus, XX XIII, p. 42. 
