388 PROCEEDINGS OF THE ACADEMY OF |June, 
of hills which reach about 5,500 feet elevation. On the northern 
and northwestern slopes of one of these, about two miles east of the 
town, we collected Sonorella, Holospira and some smaller shells. 
Holospira is very abundant (over 1,500 collected by H. A. P.), 
living in mellow earth under stones, in ‘‘nests”’ of from six to twenty 
or more, usually standing vertically, apex up, and buried in earth 
up to the summit. While the sculpture of this species is coarser 
than that of typical H. cionella, yet there are some equally coarse 
individuals of the latter. It is quite possible that H. cionella may 
eventually be ranked as a subspecies of H ferrissi. 
In the débris of the San Pedro River above the 8S. P. R. R. bridge, 
near Benson, Arizona, we found three specimens representing as 
many races of Holospira. One is the upper half of a slowly tapering 
species, evidently new. The others are probably races of H. ferrissi. 
One specimen has the appearance of a small H. f. fossor. It has the 
same sculpture, a low axial lamella, and measures, length 7.6, diam. 
3.1 mm., 92 whorls. 
The other shell resembles H. ferrissi in having three internal 
lamelle, the superior and axial lamelle being strongly developed. 
The ribbing is as fine as in the most finely ribbed ferrissi—decidedly 
finer than in fossor. The form is more slender than in ferrissi. 
This shell apparently represents another subspecies or local race ~ 
of H. ferrissi. As it may have drifted a long distance, it had better — 
be left nameless until found in its natural habitat. 
Holospira ferrissi sanctecrucis n. subsp. Pl. XV, fig. 7. 
The shell is similar to the most slender and fine-ribbed examples 
of H. ferrissi in form and sculpture, except that the apical whorls 
are more mucronate. The three internal lamelle are lateral in posi- 
tion, strongly developed, especially the superior one, whieh is a half- 
whorl long. 
Length 8.5, diam. 3.2 mm.; whorls 113. 
Valley of the Santa Cruz‘*River, above Tucson, Arizona. Type 
No. 112,239, A. N.S. P., found in flood débris of the river a short 
distance above the Congress St. bridge, Tucson. 
This is some distance west of any other record of Holospira in the 
United States. In Mexico the genus extends to the Gulf of Cali- 
fornia. The lamelle are much stronger than in any of the lot of 
H. ferrissi which we have opened. 
Although there cannot be much doubt that this species inhabits — 
some limestone hill not far from the river, we failed to find it in the 
quite limited time we spent in the neighborhood. It may have 
