90 



PROCEEDINGS OF THE ACADEMY OF [VOL. LXXIV 



Locality 



Mu rray Canyon . . 

 Murray Canyon.. 



Murray Canyon.. 

 Murray Canyon.. 

 Murray Canyon.. 

 Murray Canyon.. 

 Tahquitz Canyon 

 Tahquitz Canyon . 

 Tahquitz Canyon . 

 Tahquitz Canyon . 

 Tahquitz Canyon . 



Maximum Minimum 

 Diameter Diameter 



lnm 



24.0 



23 



21 



20 



20 



19.0 

 25.3 

 24.6 

 24.7 

 20.7 

 20.3 



mm. 



19.8 



20.4 



17.5 



17.0 



17.1 



15.8 



20.6 



20.5 



20.2 



17.2 



16.7 



Altitude 

 mm. 

 15.1 

 15.5 

 12.7 

 13.2 

 13.4 

 11.6 

 15.5 

 18.5 

 15.3 

 13.6 

 14.1 



Diameter 

 Umbilicus 



2.0 

 2.0 

 1.8 

 1.8 

 2.3 



1.5 



Condition of 

 Umbilicus 



nearly covered 

 nearly covered 

 partly covered 

 partly covered 

 partly covered 

 partly covered 

 partly covered 

 covered 

 covered 

 partly covered 

 nearly covered 



Aperture deflection of last specimen mentioned in table, 50°. 

 Material has been examined as follows: 



No. 



Spec- Locality 



imens 



3 Base of San Jacinto Mts., 

 W. of Snow Or. Canyon 

 7 Slope back of Palm Springs, 



San Jacinto Mts. 

 9 do 



(i do 



100% Entrance to Tahquitz Can- 

 yon, San Jacinto Mts. 

 1 (i Murray Canyon, San 



Jacinto Mts. 

 9 West Fork Palm Canyon, 

 San Jacinto Mts. 

 12 West side PalmCanyon, 



San Jacinto Mts. 



20 East side Palm Canyon, 



Santa Rosa Mts. 



1 Little Palm Canyon, Santa 



Rosa Mts. 



2 Promontory E. of Palm 



Valley, Santa Rosa Mts. 



Altitude Collector Date Condition 



1,500 ft. Sta. XV11 Apr. 3, 1920 dead 



500ft. Geo. Willett Mar. 18, 1919 living 



" ft. A. G. Smith Mar. 25, 1920 1 living 



" ft. Sta. IV Apr. 1, 1920 dead 



A. G. Smith Mar. 25, 1920 living 

 1,500- 



2,000 ft. A.G.Smith Mar. 24, 1920 living 



750 ft. Sta. IX 



100- 



1,100 ft. Sta. X 



900- 



1 ,300 ft. Sta. XI 



1,200ft, Sta. XIV 



500 ft. Sta. Vlll 



Apr. 2, 1920 



dead 



Apr. 2, 1920 dead 



2 adults 

 Apr. 2-3, 1920 1 juv. living 



Apr. 3, 1920 dead 



Apr. 2, 1920 dead 



One of the principal objects of our expedition of April, 1920, 

 was to establish certain facts regarding the range of this most 

 conspicuous of the desert snails. While its extreme limits were 

 probably not ascertained, we collected it at many stations, from 

 Station Y1II on the promontory at the mouth of Palm Valley 

 on the east, up Palm Canyon and Little Palm Canyon to Stations 

 XI and XIV, and thence around Palm Valley via Stations 

 XII, IX, and IV to Palm Springs, and then again at Station 

 XVII on the slope just west of the entrance to Snow Creek Canyon, 

 well up into the San Gorgonie Pass. Mr. Smith had previously 

 collected the species in some numbers in the lower part of Murray 



