68 PROCEEDINGS OF THE ACADEMY OF [Feb., 



wasatchensis from the next station and peripherica from other locali- 

 ties. As we had expected, Pilsbry's report on the soft anatomy is 

 that the genitalia of wasatchensis and peripherica agree. As usual, 

 Vitrina alaskana Dall is common at this station. 



Sta. 109. This station is east of, but continuous with, Sta. 108, 

 the separation having been made only because of the greater variation 

 at the lower end of the colony. Following up a draw toward the 

 mountain, the smoother, depressed, non-angular form soon dis- 

 appeared, but the typical, high-spired, strongly ribbed, carinated 

 form was found plentifully under the leaves, often with very scant 

 cover, a single small leaf being sometimes sufficient, though the 

 weather was hot and dry. The colony continues up the mountain 

 slope into a quartzite slide, where many of the large pieces of rock 

 are well rounded. Some years ago brush fires burned the leaves to 

 the bottom of the slides along this slope, so we were able to find no 

 live snails above the brush in the ravine and along the side of the 

 valley, which was not touched by fire. We had very carefully 

 searched the region for several miles north and south and up the 

 canyon for this species, but without success until we reached this 

 place, which seemed to be the last chance. We are quite convinced 

 that it is the exact type locality of the subspecies. It answers 

 Hemphill's description, as no other place we found does, but he does 

 not appear, from his notes, to have worked clown into the gulch 

 where the live snails are plentiful now. The topography and an old, 

 abandoned road make it seem likely that he would have passed over 

 this quartzite slide on his way to the mountain. In his description 

 he says: "This pretty and interesting shell I found among quartzite 

 boulders, in crevices sufficiently large to afford cool and moist retreats 

 during the active summer season and safe places for hibernating 

 during the cold months. This shell seems to be confined in its range 

 to a very limited area, for I did not find a single specimen, either 

 dead or alive, outside of a little plat containing an acre of ground." 

 The last sentence quoted agrees with our experience, after collecting 

 from 126 stations in Utah and southern Idaho. Hemphill's state- 

 ment that almost the first shell he picked up at Ogden was wasatchen- 

 sis indicates that he did not go first into the canyon, or he would 

 have found there plenty of depressa and no wasatchensis. 



Promontory Range. 



This range of mountains forms a narrow peninsula jutting into 

 Great Salt Lake from the north. The southern portion formed an 



