306 PROCEEDINGS OP THE ACADEMY OF [NoV.-DeC, 



Very few examples are in the Gundlachia stage; none were found in 

 the septate stage. Many have the narrow, high, obhque shape of 

 septates, but without septum. Many of them reached the normal 

 size of septates, then had a resting stage during which the shell became 

 blackened, subsequently resuming growth along the margins, forming 

 a narrow, oblique shell somewhat like A. parallelus in outline. 

 Other examples become wider, about as in A. rivularis, in the second 

 period of growth. The early stages are similar in all, having the usual 

 Ferrissia sculpture. 



Those individuals in the Gundlachia stage do not appear specfi- 

 cally separable from G. callfornica. 



PHYSID^. 



Physa virgata Gld. 



Small specimens which appear to belong to this species were taken 

 in lower Sabino Canyon, with Gu7idlachia. 



List of Collecting Stations in the Santa Catalina, Rincon, 



TORTILLITA and GaLIURO MOUNTAINS. 



For the Santa Catalinas and Rincons, these stations can be located 

 and approximate elevations ascertained by reference to the U. S. 

 Geological Survey topographic map, Tucson Quadrangle. As dif- 

 ferent sets of station numbers were unfortunately used in different 

 years, these numbers can only be used in connection with the dates. 



SANTA CATALINA 

 Stations of 1913 (J. H. F.) 



1. Sabino Canyon, bluffs on east side of creek at water gauge dam. Eleva- 

 tion about 4,500 ft. 



2. Same, quarter mile farther up. 



3. Rock slides near camp at "Picnic Grounds," Sabino Canyon. 



4. Slide north of camp, 4,800 ft. 



5. Mountain east of camp. 



6. About 2 miles along trail to Soldier's Camp. 5,000 ft. 



7. Spring near Ranger Station at mouth of Sabino Canyon {Physa and Gund- 

 lachia) 4,500 ft. 



8. Mouth of Sabino, foot of bluff, west side. 4,500 ft. 



9. Rocks 1 mile above camp. 



10. Vantana Canj^on at its mouth; a small dry canyon next west of Sabino, 

 not named on topographic map. Ca. 4,500 ft. 



11. Rock Canyon, in "quartzite" bluff. This is the second small canyon' 

 west of Sabino. About 4,500 feet. 



12. Vantana Canyon, west .side of east mouth. Same elevation. 



13. Bear Canyon, east side. 14, same, west side, near 13. 



15. Mile above camp in Sabino, on mountain slope, west side. About 5,000 ft. 



16. Slide below preceding, about the same elevation. 



17. First rocks below Mud Springs, on Pine Canyon (a branch of Sabino 

 above Sabino Basin). Mud Springs are about 9 miles south of Soldier's Camp. 

 About 7,000 ft. 



18. Soldier's Camp. 



