1910.] 



NATURAL SCIENCES OF PHILADELPHIA. 



91 



In "Canyon No. 3" (not knowing a better name) the shells were 

 sometimes specked with transparent clots. 



Alt 



Diam 16J 



Hi 



161 



Hi 



16 



10i 



16 



10 

 15* 



Limestone Mountain is thickly covered with juniper, mountain 

 mahogany and other trees and shrubbery, for it is in a U. S. Forestry 

 Preserve. The shells were found in the upper part of the mesa before 

 the rough ground was reached, in company with Holospira, but small 

 in size. As the hill became higher the shells were larger and more 

 numerous. Here also was found a toothed form of Ashmunella and 

 also Pupa? and other of the smaller species. The mountain is composed 

 entirely of limestone, upon the northern slope at least. Rocky cliffs 

 and talus gave the snails ample shelter. Between this station and the 

 Cave Creek Station, about 25 miles distant, there are no limestone 

 exposures and no Oreohelix chiricahuana. 



Oreohelix barbata Pils. PI. VI, Figs. 1-3. 



Oreohelix barbata Pils., Proc. A. N. S. Phila., 1905, p. 280, pi. 25, figs. 57, 

 58 (shells); pi. 19, figs. 5 (genitalia); pi. 22, fig. 6 (teeth). 



. Twenty colonies of this species have been found, all between the 



head of the southeast fork of Pinery 



Canyon and the Rucker "box," at 



elevations of not less than 7,000 feet, 



and within a distance of twelve miles 



in length and two to three miles in 



width. They dwell upon all sides of 



these high peaks in the rock slides or 



talus, and among the rocks upon the 



slopes of the gulches and ravines. Ferriss and Daniels found the most 



robust specimens living under from two to three feet of rock well 



covered over with sod, with the most perfect specimens of Ashmunella 



chiricahuana, a toothed Ashmunella, Sonorella, virilis and the little 



mountain rattle-snake, Crotalus pricei. In Cave Creek Canyon they 



often occur under one or two feet of rock. 



In their own territory Ashmunella, Sonorella and the other forms of 

 Oreohelix are usually to be found wherever the conditions are favorable ; 

 but it is not so with O. clappi and O. barbata. These snails are found 

 only by chance, in isolated colonies, and these colonies are usually 

 divided into families, the old pair and their spring crop of all sizes 

 when not fully matured live together. 



Every colony as a rule has some peculiarity. 0. barbata ranges 



Fig. 14. — O. barbata, denuded shell 

 from Cave Creek, Station 4. 



