392 PROCEEDINGS OF THE ACADEMY OF [June, 
The absence of the common western Sonorellas (santaritana and 
walker’) on the eastern slope, and the occurrence there of another 
species (\S. g. occidentalis) indicates a certain amount of local faunal 
differentiation, and it seems likely that work in the northern, southern 
or eastern parts of the range would result in a number of additional 
species of Sonorella. By the absence of Oreohelix and Ashmunella 
(in the parts we explored), the Santa Ritas differ remarkably from 
the Huachucas, the next range eastward. 
We obtained very few small shells. 
Vitrea indentata umbilicata (CkIl.), Stations 7, 12, 17. 
Euconulus fuluus (Miill.), Station 7. 
The locations of collecting stations follow. 
Station 1. In rock along banks of stream flowing from Agua 
Caliente Canyon, immediately south of the spring. 
Station 2. Northern base of bluff southeast of Station I 
Station 3. About half way up ‘Soldier Canyon,” a short canyon 
immediately north of the mouth of Agua Caliente. 
Station 4. Pool of Agua Caliente Spring (Physa humerosa (2), 
frogs, ete. collected). 
Station 5. Walnut Canyon or branch of Agua Caliente, which 
opens about 200 yards below the miners’ cabin midway of A 
Canyon. Shells abundant above and below the mine, in piles of 
heavy granite rock. None found in “ Walnut basin” higher up. 
Station 6. On the ravine south of cabin in the saddle, at head of 
Agua Caliente. 
Station 7. Madera Canyon, about half way down the steep slope 
from camp. 
Station 8. Madera Canyon, about 100 yards above “Old Johns 
Camp” in an extensive rock pile in the bed of the canyon, about 
10 feet above the stream. This is opposite the saddle at head of 
Agua Caliente. 
Station 9. Head of Josephine Canyon, on the flank of Mt. 
Hopkins, in friable, angular, rocky banks of canyon. 
Station 10. Head of Josephine Canyon, a few hundred feet up 
the branch leading to the saddle next to Old Baldy. 
Station 11. About 100 yards west of camp in saddle. 
Station 12. Half a mile down (west) from camp. 
Station 13. About 10 rods above Station 12, on the branch leading 
to the spring near camp. 
Station 14. A short distance above Station 12 on the branch 
running near camp. 
Station 15. Bed of Madera Canyon near the fork. 
Station 16. Eastern (Madera) flank of Mt. Hopkins, about a mile 
south of Station 7. 
Stations 17, 173. Camperel Canyon, on the eastern slope of 
the range. 
