1918.] NATURAL SCIENCES OF PHILADELPHIA. oll 
canyon streams live the mountain trout, friendly and well condi- 
tioned, but they are not the cut-throat trout of the Colorado. 
On the whole the Mogollons, in scenery and camping delights, are 
not far behind the White and Blue Mountain region of eastern Ari- 
zona. Silver City is the nearest and most convenient railway 
station, and moreover it lies in a region unexplored by the snail 
fraternity. 
One more killing was made on the return to Clifton, a colony of 
Sonorellas at Steeple Rock, Sept. 14. Thus this event of 1914 had a 
continuous run of two months and seven days. 
Aside from the minute Canadian Zone snails which have a wide 
distribution at high levels, and the minutiw of the desert foothills 
such as Thysanophora hornii, Succinea avara, the small Z onitoides, ete., 
there are several forms showing close affinity between the San Fran- 
cisco-Mogollon region and the Chiricahua Range. The species 
Sonorella binneyi, Ashmunella chiricahuana and Orohelix barbata of 
the Chiricahuas are represented here by S. binneyi franciscana, A. 
mogollonensis and O. barbata. The toothed Ashmunellas are of 
nearly related species, and the same group of forms extends farther 
east in New Mexico to the Black Range. None of the species 
mentioned are found in the northern or Dos Cabezas part of the 
Chiricahua range, their habitats being from 80 to over 100 miles 
south of the regions now under consideration. The intervening 
region is at the present time too dry for the existence of these snails. 
HELICII 2. 
Sonorella grahamensis n. sp. PI. VI, figs. 7, 7a, 7b. 
The shell is umbilicate (the width of umbilicus contained about 84 
times in the diameter of shell), very thin, tawny-olive, paler at the 
base, with the usual band; not very glossy; under the lens showing 
the usual weak growth-lines, and both above and below there are 
numerous spiral impressed lines. Whorls slowly increasing at first, 
the last rapidly widening, descending in front. Aperture rounded- 
oval, quite oblique. Peristome is thin, very little expanded. 
Alt. 10, diam. 19 mm.; umbilicus 2.2 mm.; 44 whorls. 
Genitalia (fig. 9). The penis has a well developed sheath at the 
base, and contains a long, tapering papilla. The penial retractor 
is inserted at the base of epiphallus and apex of penis as in the 
hachitana group. There is a short flagellum. The organs measure: 
Length of penis 9 mm.; papilla 7; epiphallus 6; flagellum 0.5; penial 
retractor 4.7; vagina 7; spermatheca and duct 19 mm. 
