THE NACTILUS. 81 



Ashmunella ashmuni Dall, Abundant at Rito. A few immature 

 specimens from the mountain locfility may possibly be the variety 

 robusta Pils. The Rito is not a great distance from Bland, the type 

 locality of ashmuni, and robusta was described as from " Jemez 

 Mountains near Bland, New INIexico, at higher elevations than 

 ashmuni." 



Oreohelix strigosa depressa Ckll. Three dead specimens at the 

 mountain locality. 



Pupilla muscorum L. One at the Rito, 



Pupil/a blandi Morse. Abundant at both the Rito and the moun- 

 tain locality. 



Bijidaria pellucida parvidens Sterki, One at the mountain 

 locality. Identified by Prof. Cockerell. 



(^Vertigo coloradensis basidens P. & V. Though the type locality 

 is Bland, N. M., none were found at the Rito.) 

 Cochlicopa lubrica Miiller. Common at the Rito. 

 Vallonia cyclophorella Ancey. Abundant at the Rito and common 

 at the mountain locality. 



Vitrina alaskana Dall. Three dead ones at the mountain locality 

 and four at the Rito. 



Euconulus trochijormis alaskensis Pils. Common at the Rito and 

 one at the mountain locality. 



Zonitoides arborea Say. Abundant at the Rito and common at 

 the mountain locality. 



Pyramidula shimekii cockerelli Pils. Only two at the summer 

 camp at the Rito, but abundant two miles above. 

 Succinea avara Say. One at the Rito. 



With the exception of Ashmunella and Bijidaria, it will be noticed 

 that this is the fauna common in the mountainous portions of Colo- 

 rado, in similar situations. It would be interesting to know how far 

 north Ashmunella extends, which could be determined by an exami- 

 nation of the Rio Grande Valley and a^ljacent mountains from 

 Buck man northward into Colorado. 

 University of Colorado, Boidder, Colo. 



