378 PROCEEDINGS OF THE ACADEMY OF [June, 
Station 42 (further north than Station 39). Similar to the above, 
having the same rude sculpture, but a little smaller in the average, 
length 11 to 13 mm. 
Station 41. Shells like Pl. XIV, figs. 4-4b. 
Holospira campestris n. sp. Pl. XV, figs. 1, 2. 
The shell is shortly rimate, cylindric, with very short terminal cone 
and mamillar apex. 23 embryonic whorls smooth (the last half 
whorl very narrow), following whorls closely and finely striate, the 
strie of the conical portion narrower, hence appearing more widely 
spaced than those of the cylindric portion, on which they are as 
wide as the intervals. On the penultimate whorl there are about 
70 striz. The last whorl is decidedly compressed below the pe- 
riphery, tapering downwards, somewhat more coarsely sculptured 
on the latter part. It is shortly rimate and built forward shortly 
from the preceding whorl. All of the whorls are very strongly 
convex. The aperture is angular at the upper outer part, elsewhere 
rounded. Peristome narrowly expanded. Axis cylindric, in the 
latter part of the penultimate and first part of the last bearing a 
stout axial lamella. There is also a long and strong parietal or 
superior lamella, and sometimes a basal lamella. Length 11.5, 
diam. 3.7 mm.; whorls 12. 
Mesa at western foot of the Dragoon Mountains at Station 26, 
along a ‘‘wash”’ or gulley at the south fence of the Fourr ranch, 
No. 112,214, A. N.S. P. Also Stations 24, 25, in the same vicinity, 
etc. 
Other specimens of the type lot (Pl. XV, figs. 1 to 1d) measure as 
follows. All but one of the specimens opened have two lamelle, 
one having three. 
Length 12, diam. 3.9 mm.; whorls 12. 
(a9 8, (79 3.9 cc ce 123. 
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Sms tA See ay eles 
te ale SF pes tO ese pares ell 
S OS Oe oe tee 
* 7s MAL he Eee ‘¢ 92 (a dwarf). 
At Station 24, a gulley running out of the Fourr ranch, the shells 
are 9 to 10 mm. long, otherwise similar. 
At Station 25, foothills west of the Fourr ranch (Pl. XV, fig. 2) 
the shells are smaller, with sculpture like the type. The peristome 
adheres for a short distance to the preceding whorl, or is very shortly 
free. The columellar lamella is within the front of the last whorl; 
