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 Mexico, 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 Mogollons 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 coopert were soon picked whenever logs or stones were 
turned in this (for snail hunters) two-day journey. At two points 
Oreohelix barbata 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 
Oreoheliz 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 
Helices 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, lying in between them. Here too in the 
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