100 PROCEEDINGS OF THE ACADEMY OF [March^ 



The genitalia are substantially similar to 0. 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.; 

 cliam. 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. PI. VIII, figs. 7 -7c. 



Oreohelix pilsbryi Ferriss, Nautilus, XXX, January, 1917, p. 102. 



While closely related to 0. metcalfei, this form appears to be suf- 

 ficiently distinct for specific rank. It is most like 0. m. concentrica, 

 but differs by the narrow, strongly raised spiral lirse and the smaller 

 umbilicus. It is also relatively higher, resembling some forms of 

 0. haydeni from the Oquirrh Range, in Utah. There are usually 

 four spirals on the base, two on the upper surface. The embryonic 

 whorls of adults and the genitalia (figured in Proc. A. N. S. Phila., 

 1916, PI. XXII, fig. 8) are substantially as in 0. vietcalfei 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, fig.?. .5-9. 



This region, which forms the southern border of the vast area of 

 cooperi, 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 4|) 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 aiid 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, " 13, " 20 " 



Fig. 7, " 15.6, " 20.6" 



Figs. 8, 8a, " 16.7, " 22 " 

 Fig. 9, '' 14.3, " 20.5 



X " 



