62 PROCEEDINGS OF THE ACADEMY OF  [Vol. LXXV 
tion 159) and two hills to the west, all that we investigated; but the 
limestone of the Whetstones was hard, sharp pointed, and had no 
snails, large or small. Subfossil Oreohelix were found in the clay 
banks of the Mustang gulches. Like the Empire Range, the Mus- 
tangs have a few stunted oaks and an abundance of foot-hill shrubs. 
Sonorella mustang P.& F. Commonly distributed. 
Oreohelix concentrata huachucana (Pils.). Fossil only. 
Holospira arizonensis mustang P. & F. 
Holospira ferrissi monoptyx P. & F. Station 285. 
Holospira whetstonensis arata P. & F. Stations 159 and 1538 
(1918). 
Polita indentata umbilicata (Ckll.). (Station 153 (1918). 
Pupilla syngenes (Pils.). Station 286. 
Chenaxis tuba (P. & F.). Stations 288, 306. 
Gastrocopta perversa (St.). Station 286. 
Gastrocopta p. sana (Pils.). Station 306. 
Gastrocopta ashmuni (St.). Stations 288, 306, 332. 
Gastrocopta a. minor (St.). Station 288. 
Gastrocopta a. imperfecta P. & F. Station 286. 
Gastrocopta dalliana (St.). Stations 286, 332. 
Gastrocopta pellucida hordeacella (Pils.). Stations 286, 288, 306, 
323. 
Huacuuca Mountirans.—Our former work on this range* was 
supplemented in the spring of 1919 by an examination of Monte- 
zuma and Copper canyons, at the southeastern end of the range, 
and further collections in other parts by J. H. F. and A. A. Hinkley. 
Ashmunella varicifera (Anc.). Montezuma canyon, Stations 
314, 321, 327 (1919). Limestone hill in pass to Copper canyon, 
Station 322. Copper canyon, Station 316. Ash Mountain, 
Stations 310, 311. 
Ashmunella levettei heterodonta Pils. Ida canyon, Station 317. 
Ashmunella levetter angigyra Pils. Station 270, mill southeast 
of cave, Bald Mt. Station 280, near mouth of Lyle canyon. 
Sonorella (see section III of this paper). 
Holospira ferrissi Pils. Northwestern end. See below. 
Zonitoides minuscula (Binn.) Station 295, Carr canyon. 
Striatura milium meridionalis P. & F. Stations 295, Carr 
canyon, and 323, Montezuma canyon. 
Pupilla syngenes (Pils.) Station 299, western cliffs of Brown 
canyon. 
Chaenaxis intuscostata brevicostata Pils. Station 300, limestone 
ridge, northwest boundary of Carr canyon. 
Gastrocopta pellucida hordeacella (Pils.) Stations 268, 294, 300. 
Gastrocopta perversa (St.). Stations 269, 270, 294, 300, 311, 268. 
3 Proc. A..N. S. Phila., 1909, pp. 495-516. 
