100 PROCEEDINGS OF THE ACADEMY OF [March, 
* The genitalia are substantially similar to O. m. hermosensis except 
for the smaller size. Length of penis 7, of its internally thickened 
lower portion 4 mm.; of epiphallus 3 mm.; of penial retractor 6.5 mm.; 
diam. shell about 17.5 mm. (No. 112,917, A. N.S. P.) 
No embryos were found in a few specimens preserved in spirit, 
taken in October. 
Oreohelix pilsbryi Ferriss. Pl. VIII, figs. 7-7c. 
Oreohelix pilsbryi Ferriss, Nautilus, XXX, January, 1917, p. 102. 
While closely related to O. metcalfei, this form appears to be suf- 
ficiently distinct for specific rank. It is most like O. m. concentrica, 
but differs by the narrow, strongly raised spiral lire and the smaller 
umbilicus. It is also relatively higher, resembling some forms of 
O. haydeni from the Oquirrh Range, in Utah. There are usually 
four spirals on the base, two on the upper surface. The embryonie 
whorls of adults and the genitalia (figured in Proc. A. N. 8. Puima., 
1916, Pl. XXII, fig. 8) are substantially as in O. metcalfei radiata and 
the other forms of that species. Embryos were not found in the 
uterus in the few specimens preserved in spirit. 
It was found only near the Oliver Mine, on Mineral Creek, about 
6 miles from Chloride, Sierra County. Several hundred living 
examples were obtained. See Nautilus, XXX, p. 102. 
Oreohelix cooperi (W. G.B.) Pl. IX, figs. 5-9. 
This region, which forms the southern border of the vast area of 
coopert, has a capacious form of the species. Many examples are 
typical in coloring (figs. 7, 9), but pale shells with faint bands or none 
are abundant, especially on Silver Creek (figs. 6, 8, 8a). Occasionally 
throughout the range, specimens were found with very broad, almost 
black bands (figs. 5, 5a). These color forms are to be found together, 
throughout the forest zone of the range. Thus, figs. 5-7 (Station 9) 
and 8, 8a (Station 43) are from Silver Creek; fig. 9 from Holden’s 
Spring (Station 26). The extremes of elevation of the spire may 
also be found in single colonies. The shape and color mutations or 
forms are spread throughout the range, though particular color-forms 
are often prevalent at one or another station. | 
The specimens figured measure as follows: 
Figs. 5, 5a, alt. 14, diam. 20 mm. 
Fig. 6, st Bigae ag ote 
Fig. 7, “15.6, “ 20.6 “ 
Rigs: (8) Be, “ WEG, 9 “paia 
Fig. 9, «14B 82-205 
