THE NAUTILUS. 45 



Physa anatina is so identified by Dr. Bryant Walker. We 

 have another lot of the same species, also identified by Dr. 

 Walker, collected by Mr. Don W. Walker two and a half miles 

 east of Shell. 



Sta. 244, just within the mouth of Shell Creek Canyon, on 

 south side of creek, about two miles above Sta. 243, 011 lime- 

 stone ledge devoid of shrubbery and other vegetation except 

 close-clinging lichens on the rock. Oreohelir yavapai extre- 

 mitatis Pils. & Ferr. was plentiful, clinging to the open face 

 of the rocks in plain sight, though the weather was hot and 

 dry. This form has been recorded from the same canyon by 

 Dr. Pilsbry. There were no rock slides or other cover, such 

 as Oreohelix usually requires, anywhere near. We obtained 

 145 live examples and over 200 dead shells in a short search, 

 one of the latter being reversed. I have never before seen 

 any member of this genus in such an exposed position. 



Sta. 245, about a mile or so from Sta. 244, same side of 

 creek, under shrubbery. We obtained 31 Oreohelix yavapai 

 extrcrnitatis Pils. & Ferr. and 46 0. pygnicca Pils. alive, to- 

 gether with many dead shells. This is the type locality of the 

 latter. Two of them were albinos. We also found Pupilla 

 'muscorum xerobia Pils., Vallonia gracilicosta Reinh., and 

 Zonit aides arborea (Say). 



Sta. 246, just within the mouth of White Creek Canyon, on 

 south side, a couple of miles south of Sta. 245, in a small brush 

 patch a few feet in diameter at the base of a low cliff near an 

 old log building. 



Euconulus fulvus alaskensis Pils. 



Oreohelix cooperi form obscura Hend. 



Oreohelix pygmcra Pils. 



Oreohelix yavapai extremitatis Pils. & Ferr. 



Pupilla muscorum (L.) 



Vallonia gracilicosta Reinh. 



Vitrina alaskana Dall. 



Sta. 247, bluff 50 yards east of Sta. 246. 0. y. extremitatis 

 Pils. & Ferr. abundant, clinging to rocks and under scant 

 mountain mahogany, clematis, etc., a few out on open ground, 

 all active after the rain of the night before. Two dead shells 



