192 PROCEEDINGS OF THE ACADEMY OF [March, 
the Grand Canyon on Powell Plateau; Kaibab-Powell Saddle; Castle 
Springs, Snake Gulch; Two Springs, Kaibab Plateau. 
Euconulus fulvus alaskensis (Pils.). 
Bill Williams Mountain. Grand Canyon, Bright Angel Trail, from 
just below rim to base of cross-bed sandstone. Mystic Spring Trail 
about 200 feet below rim, and Station C, about a half-mile west of 
Bass’s Camp; ‘‘Spectacle Cove,” Station A. North of the Grand 
Canyon; Powell Plateau, Station 18; Kaibab Saddle and plateau at 
Stations 5, 7, 12, 66, 100; Riggs Spring, Snake Gulch; Castle Springs; 
Warm Spring Canyon; spring on the northwest side of Mt. Trumbull, 
Zonitoides milium meridionalis Pils. 
Bill Williams Mountain. 
Zonitoides minuscula (Binn.). 
Bill Williams Mountain. Base of Mt. Trumbull. 
Zonitoides arborea (Say). 
Bill Williams Mountain. Snake Gulch, Station 114. 
LIMAOIDA. 
Agriolimax hemphilli ashmuni P. and V. 
North of the Grand Canyon in Snake Gulch at Big Spring and 
Station 49, below the Coconino Smelter; also Station 48. 
SUCCINEIDA. 
Snocinea avara Say. 
Bass Station, Grand Canyon R. R.; Grand Canyon on the Mystic 
Spring Trail along the slope a few hundred feet below the rim, and 
in the amphitheatre 4 to ? mile west of Bass’s Camp, on the upper slope; 
“Spectacle Cove” and Seep Spring, 2 miles west of trail, below cross-bed 
sandstone; red wal] sandstone at 5,000 feet. On the north side of the 
river we found it along Shinumo Creek, in the box of White Creek, and 
Ferriss and Daniels took it on the Kaibab Saddle, at Oak Springs, 
Snake Gulch, Station 114, at Warm Spring Canyon, Station 59, and 
the Hurricane Fault, Station 46, 6,000 feet, near Mt. Trumbull. 
It lives in a great variety of stations, a large form occurring in humid 
places, smaller shells in arid situations. 
Succinea retusa Lea. 
The Greens, 6 miles west of Kanab, Utah; Deception Lake, northwest 
of Kanab. 
Succinea hawkinsi Baird. 
The Greens, 6 miles west of Kanab, Utah. The specimens seem 
to be typical of this very rare and distinct species, here first reported 
from so far south. 
