336 PROCEEDINGS OF THE ACADEMY OF [May, 



finally develop the revolving lines into prominent ribs as seen on the 

 surface of var. haydeni Gabb. " 



The Franklin District. 



Franklin is situated in Idaho, a mile or two north of the northern 

 line of Utah, and Sta. 38 is in Idaho, but stations 39 and 40 are 

 a mile and a half or two miles south of the line, in Utah. 



Oreohelix strigosa fragilis (Hemphill). PL XVI, fig. 1. 



Patula strigosa var. fragilis Hemphill, Naut., IV, 17-18, 1890. Binney's 

 4th Suppl. Terr. Moll., pp. 174-175, 1892. 



Sta. 38, a small, isolated, barren-looking mountain about a mile 

 west of Franklin, Idaho, in the edges of Paleozoic limestone slides 

 surrounded by sage brush. The specimens from this station are 

 small (few exceeding 17 mm. in diameter), much depressed, not 

 quite so fragile as from the next station, and with a wider umbilicus, 

 as would be expected from the depressed form. The noticeably 

 translucent shell and general appearance, however, connects them 

 with this subspecies, rather than with typical depressa. From this 

 station we have also 1 Vallonia cyclophorella Ancey, 1 Pupilla blandi 

 (Morse) and 2 Succinea avara Say. 



Sta. 39, Prater Gulch, south of High Creek Canyon, Utah, about 

 six miles southeast of Franklin, Idaho, nearly east of the railroad 

 station of Webster, Utah, in quartzite talus. Rare in several slides 

 visited, very abundant in one. The specimens are typical, but 

 rather larger than most of those in Clapp's Hemphill collection, 

 averaging about 20 mm. in diameter, altitude variable in its propor- 

 tion to transverse diameter, but nearly all higher than the average 

 from Sta. 38. This subspecies is closely allied to depressa, but differs 

 slightly in anatomy, in the translucency and fragility of the shell, 

 and in the narrowing of the umbilicus by the reflected base of the 

 columella. Near Franklin, on red sandstone, is given as the type 

 locality. One might be led to suspect that the fragility of shell is 

 due to lack of lime, from the fact that Hemphill's material came 

 from sandstone and our No. 39 from quartzite, but the snails from 

 Sta. 38, in a limestone habitat, are also fragile, though to a less 

 degree, while depressa from quartzite slides are not fragile. The 

 Sta. 39 shells are so fragile that many of them were broken in carrying 

 them in the bags until we found time to clean them, a thing which 

 did not happen with any other Oreohelices we collected, and they 

 were not subjected to as hard usage as some. Indeed, it was the 

 fact that they broke so easily that attracted our attention in the 



