102 PROCEEDINGS OF THE ACADEMY OF [March, 
The lower part of the penis contains two or three fleshy ridges, 
the upper ends of which project a little into the cavity of the thin- 
walled portion. 
Thysanophora ingersolli (Bld.). 
Common throughout the humid forested zone, especially among 
aspens. Taken at 16 stations, from Sawyer Peak to Black Canyon. 
Thysanophora hornii (Gabb). 
Not found in the Black Range. A few were taken in the Cuchillo 
Mountains. 
UROCOPTIDAL. 
Holospira cockerelli Dall. 
Holospira cockerelli Dall, Nautilus, XI, October, 1897, p. 62. Pilsbry, Proc. 
AYNSS. P., 1905, p. 218, Pl. 26, fig. 6. 
Sam’s Canyon, about 4 miles south of Chloride. Cuchillo Moun- 
tains. Big Palomas Creek, near Hermosa, in a mountain across 
stream, above the fork, at Ocean Wave Mine; also in the next peak 
below. Little Palomas Creek, in a limestone mountain 2 miles 
north of Black Bob’s ranch. 
The specimens from the Little Palomas are about typical in size: 
Length 12.5 mm., 133 whorls. 
(a9 10.5 cc 2 (a9 
The largest are from the Cuchillo Mountains on the south side 
of the peak, where some are 16.8 mm. long, with 163 whorls. Speci- 
mens from the other localities are intermediate in size. All we have 
opened have a single short lamella low on the axis in the penult 
whorl. 
The type was found in drift debris of the Rio Grande. Subse- 
quently Mr. Metcalfe found one “near Kingston’’—probably 
northward near the southern localities given above. 
We did not find Holospira regis Pils. and Ckll., which was collected 
by Mr. Metcalfe somewhere in the Kingston district. 
ENDODONTIDZ. 
Pyramidula cronkhitei (Newc.). 
Found everywhere (18 stations) throughout the wooded zone. 
Also in the Middle Percha drift below Kingston, Mineral Creek near 
Chloride, and Little Palomas Creek; probably washed down from 
above. 
Helicodiscus arizonensis P. and F. 
Rather sparingly found at many stations throughout the Black 
Range, from the summit to the level of Kingston. Also San Mateo 
and Cuchillo Mountains. 
