392 PROCEEDINGS OF THE ACADEMY OF [June, 



The absence of the common western Sonorellas (santaritana and 

 walkeri) 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 indeniata umhilicata (Ckll.), Stations 7, 12, 17. 



Euconulus fulvus (Miill.), Station 7. 



The locations of collecting stations foUoAv. 



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 1. 



Station 3. About half way up "Soldier Canyon," a short caiiyon 

 immediately north of the mouth of Agua Caliente. 



Station 4. Pool of Agua Caliente Spring {Physa humerosa (?), 

 frogs, etc. collected). 



Station 5. Walnut Canyon or branch of Agua Caliente, which 

 opens about 200 yards below the miners' cabin midway of A. C. 

 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 doT\Ti 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 Cahente. 



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 

 rLinning 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, 17^, Camperel Canyon, on the eastern slope of 

 the range. 



