105 
Great diam., 14; height 8 mm. 
Habitat, Santa Catalina Island, Cal. 
The presence of a colony of land shells, living on Santa Catalina 
[sland today, belonging to the strigosa group, whose metropolis at the 
Plate 4—Helix var. avalonensis—Hemphill 
present time is several hundred miles distant and northward from this 
island, at an elevation of from four to eight or ten thousand feet above 
the sea level, with a great stretch of desert-like country intervening 
