96 PROCEEDINGS OF THE ACADEMY OF [Vol. LX XV 
In the Mustang Mountains only fossil specimens were found. 
Those from Station 157 (1918) measure 20-22 mm. diameter, have 
a moderately raised spire, and are practically typical of the sub- 
species. At Station 153 (1918) the shells are smaller, 15 to 19 mm. 
diameter. 
BULIMULID&. 
Bulimulus nigromontanus Dall. Plate I, figs. 3, 4. 
Pajaritos Mountains in Pina Blanca canyon, Stations 225, 236. 
Also 5 miles north of Moor Ranger Station, Pina Blanca, in a small 
canyon running east, opposite the main gulch from the Tumacacori 
Mountains, in a slide on the north slope of a hill of crumbling 
porphyry, Ferriss and Hinkley, 1919. 
Except in having a somewhat smaller umbilicus, these specimens 
appear to agree with the description of B. nigromontanus, which 
came from Black Mountain, 12 miles south of Monument 77 of the 
International Boundary, on the right bank of the San Bernardino 
River, in Sonora. The localities now recorded carry the species 
about 130 miles further west. It is a species new to the United 
States list. 
UROCOPTID&. 
Fig. 12.—Holospira ferrissi caneloensis. Fig. 13.—H. f. monoptyx. Fig. 14. 
—H. p. fluctivaga, Fig. 15.—H. whetstonensis. Fig. 16—H. w. arata. Fig. 
17.—H. arizonensis mustang. In each case the type is figured. 
Holospira ferrissi Pils. 
This was taken at Station 268, Manila mine, at the northwest 
end of the Huachucas, the type locality. Also Station 275, foothill 
a mile east. Many, but not all, specimens have 3 internal lamelle, 
and the whorls are ribbed throughout. Ten topotypes opened 
have lamelle as follows: 
