310 PROCEEDINGS OF THE ACADEMY OF [NoV.-DeC, 



The San Francisco and the Blue rivers have been seriously torn up 

 by floods in recent years, but many of the snails remain. Nearly 

 all the farmers have been swept out. Oreohelices, Sonorellas or 

 Ashmunellas exist in every favorable situation from Clifton to Bob 

 Cat on the interstate boundary, except in a few short stretches of 

 these rivers where the snails seem to have a dislike for the soil, the 

 chemistry of the rocks, or something not traced. This is about 

 fifty miles in a straight line, and thus very long miles. 



Again on the Luna road to Alma, in New JMexico, Oreohelix was 

 found on the crest of the San Francisco Mountains, and the largest 

 colony, with many albinos, came from the Rio Saliz, a small stream 

 draining the San Francisco Mountains eastward into the San Fran- 

 cisco River. 



The MogoUons might be called a federation of sharp peaks. It is 

 not a high plateau like the White and Blue mountain region, yet the 

 forest conditions and tree associations are almost identical. On the 

 Bursam wagon road from Mogollon to Willow Creek, ascending to 

 9,000 feet, and usually running along the north slope of the peaks, 

 the conditions for snails are ideal. Ashmunella mogellonensis and 

 Oreohelix cooperi were soon picked whenever logs or stones were 

 turned in this (for snail hunters) two-day journey. At two points 

 Oreohelix barhata was found with the other two species. Afterward, 

 when the canyons facing west and south were explored the smaller 

 Ashmunellas were found in colonies with the three above mentioned. 

 Sonorella has not yet been found in the Mogollon range. In the ex- 

 treme southern part of Arizona (Chiricahua range) the large toothless 

 Ashmunellas are in colonies with the smaller toothed forms and 

 Oreohelix barbata with them. Also a Sonorella and sometimes Holo- 

 spira. Three species of Sonorella have been found in one slide; but 

 the general Arizona rule still remains one species of the genera of 

 Hehces to a colony. 



The banks of the canyons running west, in the Mogollons, were 

 abrupt, and the south bank furnished shade and cover. In Big 

 Dry Canyon, running directly south, the banks were so abrupt and 

 close together that snails were living on' both sides of the stream, 

 and in the greatest abundance within our experience. 



The wide differences in the Ashmunellas of the Mogollons and the 

 presence of the Chiricahua Oreohelix barbata seem to indicate an al- 

 luring future for Mogollon conchology. We believe that the deeper 

 canyons, penetrating farther into the large mountains, had greater 

 riches than Big Dry, l^dng in between them. Here too in the 



