94 PROCEEDINGS OF THE ACADEMY OF [Feb., 



On the west slope of Snow-shed Mountain, at the head of Cave 

 Creek, almost one continuous talus, was a colony similar to the preceding. 

 Shell transparent when young, occasionally with 5 short fringes. 

 Diam. only 10^, alt. 5f mm. 



In a dry talus fully exposed to the sun and sloping to the south 

 on the head of Rock Creek was a colony heavily covered at maturity 

 with 9 or 10 black fringes, periphery rounded as in the Rustler Park 

 and Barfoot Park specimens; aperture 4^ mm. Margins connected 

 by a thick callus; umbilicus varies from .3 to 3^. Diam. 11, alt. 6£. 



The five colonies above were found by Ferriss in 1908. 



In 1907 Ferriss and Daniels found a small heavily fringed form in 

 the talus of a gulch in the head of the southeast fork of Pinery Canyon, 

 that in fringes resembles the type of barbata. 



Like the above it had from 9 to 10 long fringes. The last whorl 

 dropped but one mm. Diam. 11, alt. 6, aperture 4 mm. 

 Oreohelix barbata minima "■ subsp. PI. VI, figs. 6, 7. 



At the head of Rucker Canyon (Station 11U) and in the Rucker 

 Box, Ferriss and Daniels found colonies in 1907 that were still further 

 depauperate than the above. Ferriss relocated the latter colony in 

 1908. These shells possess 4\ to 4h whorls, the last whorl regularly 

 angular, the angle weakening neai the aperture in old shells. Toward 

 the end the whorl falls deeply at maturity. There are from 6 to 7 

 spiral fringes in the best preserved examples, but adults generally 

 are denuded or show only traces of the spiral wreaths. The margins 

 of the lip converge and form a perfect union in maturity, being joined 

 by a very short parietal callus, and the aperture is sometimes raised 

 above and free from the penultimate whorl. 



The shells from the head of Rucker are uniform brown in color and 

 measure : 



Alt. 5, diam. 10 . 3, umbilicus 3, diam. aperture 3 . 5 mm. ; whorls 4^ 

 " 5, " 10, " 3.1 " " 3.25 " " 4J 



Those from Rucker Box are light brown, sometimes albinistic, light 

 green. 



Six specimens from the Box of Rucker Canyon, type locality, 

 measure : 



Alt 5.8 



Diam 10 



This is the most decadent race, being reduced in size in addition to 

 the deeply descending last whorl and in old shells the nearly or quite 

 free peristome. Colonies of larger forms of O. barbata occur at greater 



