1905.] NATURAL SCIENCES OF PHILADELPHIA. 281 
upper part is densely papillose inside. The epiphallus bears the penis- 
retractor muscle, some distance from its base, and the vas deferens 
enters centrally at the end. The duct of the spermatheca is some- 
what swollen basally. The uterus contained neither eggs nor 
embryos, the specimens having been collected in February. 
The radula (Pl. XXII, fig. 6) has 23.1.23 teeth. The mesocones are 
long, and all the teeth have well-developed ectocones. The marginal teeth 
are bicuspid as usual, the cusps unsplit. 
Oreohelix yavapai n.sp. Pl. XXV, fig. 53. 
Shell thin, whitish more or less stained with brown, with a faint brown 
band above and another close below the periphery. The small periph- 
eral keel extends to the aperture, but is pinched up less than in neo- 
mexicana; the last whorl elsewhere is well rounded, the earlier whorls 
flattened. Embryo of 24 whorls, the first nearly smooth, convex, the 
next more flattened, finely, densely striate obliquely, and very strongly 
striate and ribbed spirally. At the end of the embryonic stage this spzral 
sculpture abruptly stops, and is succeeded by sharp oblique striation which 
becomes cut by a few spiral lines. On the last whorl there are more 
spirals, usually emphasized as series of granules or pits upon the oblique 
strie (indicating cuticular processes in perfectly fresh shells). _Whorls 
about 54, the last hardly descending in front. The umbilicus is ample, 
as in O. y. neomexicana. Aperture oblique, rounded, with thin lip. 
Alt. a A 9.5 mm. 
Diam. 152 1p: “ 
Purtyman’s ranch, on Oak creek, Yavapai county, about 40 miles 
from Jerome, Arizona (northwest of the center of the Territory), types 
No. 79,415, A. N. 8. P., collected by E. H. Ashmun. Also found on 
the summit of Mt. Mingus, near Jerome, and fossil in a road cutting 
in Walnut Gulch, near Jerome (Ashmun). 
Dr. R. E. C. Stearns reported a form probably identical with O. 
yavapar from Coon Mountain, a curious crater about 10 miles south of 
Canyon Diablo, and about 3 days’ travel from Flagstaff, Arizona 
(Patula strigosa Gld., Nautilus, VI, May, 1892, p. 1; Proc. U. S. Nat. 
Mus., XVI, p. 745). 
The embryonic voung shells, 2 mm. diameter with 24 whorls, are 
acutely carinate (Pl. XI, fig. 13). 
This species differs from O. strigosa in the form of the shell, which is 
more like O. hemphilli, and by the diminutive penis, while the epi- 
phallus is longer in proportion than in forms of strigosa I have exam- 
