1917.] natural sciences of philadelphia. 61 



The Franklin District, Idaho and Utah. 



Franklin is only a mile or two north of the southern boundary of 

 Idaho, due east of Weston. We visited a good-looking hill about 

 four "miles northeast of towTi, where we found the vegetative cover 

 poor and no snails. 



Sta. 93, dry slope southeast of Franklin, about half way to the 

 base of the mountain, due north of the type locality of Oreohelix 

 haydeni cornigata H. & D. Succinea oregonensis Lea was very 

 abundant among the quartzite and red sandstone boulders thickly 

 stre^vii over the surface of the gentle slope, sheltered by very scant 

 vegetation growing close to the rocks. Tracks of horses and cattle 

 made when the ground is soft after rains hold a little water for a 

 short time after storms, thus insuring periods of activity sufficient 

 to sustain a very prosperous colony of these snails. They were 

 clinging to the rocks and to the soil beneath by means of a glutinous 

 substance which caused the snails to stick to our fingers and tweezers 

 in removing them from the rocks. Dry, membranous ''scars" 

 adhering to the rocks showed former places of attachment during 

 periods of inactivity, reminding one of Sojiorella scars. We obtained 

 over a thousand specimens alive in a very short time on the Idaho 

 side of the boundary, then found dead shells all along the way across 

 the line into Utah, to the edge of the mouth of High Creek Canyon; 

 but not realizing at the time that we were crossing the line, we did 

 not look for live examples. 



Sta. 94, small reservoir in shallow ravine north of Sta. 93. Physa 

 ampuUacea Old., scarce. 



Sta. 95, north side of High Creek Canyon, southeast of Sta. 93, 

 just within the mouth of the canyon and continuing some distance 

 up the canyon on the same side. Oreohelix strigosa fragilis (Hemph.) 

 in quartzite and red sandstone slides. 



Sta. 96, similar slides a mile or so up the canyon on the south side, 

 the same subspecies, scarce. Further up the canyon the walls are 

 of limestone, but strange to say our brief search there did not 

 yield snails. Hemphill states that the t^'pe locality of fragilis is 

 "near Franklin, Idaho, among Red Sandstone." The topography 

 suggests this canyon as a very likely one for him to have visited, the 

 other likely one being two or three miles to the north, a little north 

 of east from Franklin and hence in Idaho. Our stations for this 

 subspecies, 39 (1915), 95 and 96 (1916), are all in Utah. If Hemp- 

 hill's type locality is any of these three, then the only Idaho station 

 known ior fragilis is Franklin Butte, west of the town, our Sta. 38, 1915. 



