1917.] NATURAL SCIENCES OF PHILADELPHIA. 87 
THE CuUCHILLO RANGE. 
This range is about six miles east of Chloride, the post office of 
Fairview at the foot of the mountains. The peaks probably reach 
up to 7,500 feet. 
On a brushy northern slope on the Thomas Scale trail, in the 
southern end of the range, Oreohelix metcalfei cuchillensis and Holo- 
spira cockerelli were found in abundance. The cover was scant, 
and cattle plentiful. Both species were found again a couple of miles 
further on, in Frank Calhoun’s pasture. In both places they lived 
in groves of oak, under limestone spawls and dead timber. 
At the north end of the range the peaks are higher, some having 
large outcrops of fossiliferous limestone, but the only evidences of 
living shells obtained were a few ‘‘bones”’ of Helicodiscus. In drift 
debris, however, were many small shells which apparently graze on 
the grassy slopes and meadows. 
THe San Mateo Rance. 
The San Mateo Range probably reaches a height of 8,000 feet. 
The southern end is about 15 miles north of Monticello Post Office, 
a village on the Cafiada Alamosa. The rock in this part of the range 
is a friable, crumbling granite. Nearly the entire southern end is 
a continuous slope of granitic fragments, many feet in depth. The 
mesa continues nearly to Monticello. Pinyon, juniper and low- 
growing shrubs cover the hillsides. Along Chippy Creek, walnut, 
quaking asp and yellow pine prevail. 
Around the edges of the rocky slides, Oreohelix cooperi and Ash- 
munella were fairly abundant, but the smaller shells were scarce. 
A day given to the peaks overlooking San Marcial, a couple of miles 
farther, added only a few O. cooper? to the collection. 
CHARACTERISTICS OF THE BLAcK RANGE MOLLUSK FAUNA. 
The snail fauna of the Black Range is like that of the Mogollon 
Range in the rich development of Ashmunella, the species being also 
related. Coarsely granulate species are a unique feature. It differs 
from the ranges southward and westward by the absence of Sonorella. 
A special feature of the range is the Oreohelix metcalfei group, wonder- 
fully varied in shape and sculpture. No doubt further members 
of this group will be found in Sierra and Socorro Counties. Oreohelix 
swopei also is special to the northern end of the Black Range, so far 
as we know. 
The crest of the range everywhere has an abundant Canadian 
