THE NAUTILUS. 7 



eastward. The higher peaks are supposed to run up to 8,000 

 feet above the sea. Very few are named, and so far as we 

 could learn none have been surveyed. The Baboquivari sys- 

 tem starts at the Mexican line and runs a little west of north. 

 As the Baboquivaris, they are 40 miles in length, then known 

 as Coyotes for 7 miles, as the Roskruge 20, as the Abbie 

 "Waterman 10, and as the Silver Bell 10 miles. We hit only a 

 few high spots in the first three, and I collected at one small 

 slide in the latter. 



On the road to Ajo we had good success in Sonorellas in the 

 small hiUs along the Comovo route, and here we first saw the 

 organ cactus and the crucifix tree. Around the Ajo moun- 

 tains — Wall's Wells and Montezuma Head — and the several 

 nearby ranges, we were unable to find any traces of Sono- 

 rellas. The last Sonorella station west was at a small group 

 of hills where the sign board of the Interior Department read 

 "Tucson 101 miles". Beyond that the basalt rocks were cov- 

 ered with white dust that may have been alkali, or the granite 

 had a face so sharp and dry the snails on a hike would require 

 tennis shoes and a canteen. A mining prospector afterwards 

 told us shells were to be found near the south end of the Big 

 Ajo range where there was a small spring and walnut trees, 

 and that they were also in the Mesquites, a range near the 

 Mexican border. We anticipated a change in conditions, and 

 perhaps Mexican or new groups of snails, and we still feel 

 that something may be found in this field — perhaps in the 

 Mesquite and border ranges, or in the Growlers, a forty-mile 

 range west of Ajo — when the Mexican bandits are a little less 

 active among the southern cattle ranges. 



On the back track we returned by way of the Covered Wells 

 and White Wells crossing the Quijota range, but found only 

 a few Pupas, Succineas, and other small ones until we camped 

 near some abandoned silver prospects in the southern end. 

 We hunted the placer holes for rattlers without success but 

 found a tiger rattler and Sonorellas in the rocks. We also 

 had further luck in the foot-hills at the southern end of the 

 Cababi range, where Mr. Cole had found Sonorellas in 1914. 



Nearly all of this western half of Pima County is occupied 



