282 PROCEEDINGS OF THE ACADEMY OF [Mch.., 
ined ; it differs from O. y. neomexicana chiefly by the stronger spiral 
sculpture of the embryonic shell and the abrupt change in sculpture at 
the inception of the neanic growth. The same differences and the wider 
umbilicus separate it from the northern O. hemphilli, which, moreover, 
differs by its dentition, as indicated below under O. y. neomexicana. 
The penis (Pl. XIX, fig. 7) resembles that of O. y. neomexicana 
except that it is larger, and the vas deferens enters the epiphallus 
centrally at the apex. There were 10 embryos in the uterus, each 
half enveloped in its podocyst. 
The jaw has longitudinal and vertical striae. The radula (Pl. XXII, 
figs. 7) has 26.1.26 teeth, those in the middle unicuspid; the ectocone 
distinctly appearing on the sixth. Marginal teeth bicuspid, the cusps 
unsplit. 
Oreohelix yavapai neomexicana un. subsp. P?. XI, figs. 8,9; Pl. XXV, fig. 59. 
The shell is thin, brown, acutely keeled, pinched in above and below 
the peripheral keel, which extends to the aperture, the whorls else- 
where convex above and below. Embryo of 2 to 24 whorls, convex 
except near the periphery where they are impressed; they are densely 
striate obliquely and rather obsoletely striate spirally. The junction 
with the subsequent neanic growth is often indistinct. Whorls 43 to 
54, the later ones rudely, very obliquely wrinkled, and showing raised 
spiral striz, usually rather indistinct. The umbilicus is ample within 
and rather widely open, exposing the penultimate whorl. Aperture 
small with simple lip, the whorl descending slowly to it. 
Alt. 8.5 7.8 mm. 
Diam. 15.6 14.5 “ 
Canyon Diablo, near Rowe, San Miguel county, New Mexico. Types 
No. 84,297, A. N.S. P., collected by Miss Mary Cooper. 
This form differs from O. hemphilli (Newc.) by its less convex em- 
bryonic whorls, which are more impressed near the periphery, and by 
the more ample umbilicus; but it differs chiefly by the unicuspid teeth 
of the median part of the radula, those teeth in O. hemphilli having well- 
developed ectocones, as in O. barbata. It seems to be rather widely 
separated geographically from the range of O. hemphilli. 
It is also before me from Beulah, in the Sapello Canyon, San Miguel 
county, at 8,000 feet (Prof. Cockerell), small specimens only 10 mm. 
diameter, with 44 whorls, perhaps not quite adult. Similar small speci- 
mens come from Las Huartes Canyon, Bernalillo county, New Mexico 
(Miss Cooper). 
