96 PROCEEDINGS OF THE ACADEMY OF [March, 
On the west slope of the Black Range there are two forms: (1) 
in the south, O. m. concentrica, broadly umbilicate, with low, wide 
spiral cords on the base, and (2) further north, O. m. radiata, with 
strong radial sculpture, remarkably like O. elrodi. On the eastern 
slope we have (3), southward, O. m. acutidiscus, broadly umbilicate, 
with fine spiral and coarser radial sculpture, and (4) further north, 
O. hermosensis, nearly smooth, angular only in front. Still further 
north a few “bones” of typical metcalfei were found, acutely keeled 
throughout and nearly smooth. Northeast of here was found 
O. m. cuchillensis, which is so weakly angular that we at first thought 
it a form of O. strigosa depressa. Further west O. pilsbryi was found. 
Further north, in Socorra County, there is O. socorroensis, an angular, 
roughly sculptured shell, as yet known only by perfectly bleached 
“bones.” 
The metcalfei group therefore comprises, besides the original type, 
forms resembling O. haydeni, O. elrodi and O. strigosa depressa; each 
being alone in its district. The distribution may be represented 
diagrammatically thus: 
pilsbryt *& 
cuchillensis *& 
* meicalfei 
*% hermosensis 
radiaia *% 
concentrica %& | % acutidiscus 
Diagram to show localities of the races of Oreohelix metcalfei relative to one 
another and to the crest of the Black Range from Sawyer to Diamond Peak. 
Seale about 16 miles to an inch. 
