38 THE NAUTILUS. 



Oreohelix cooperi (W. G. B.). Horse Creek Station, Laramie 

 County, Wyoming (Butters). 



Oreohelix cooperi minor (Ckll.). North Fork of Rock Creek, 

 Johnson County, Wyoming (Betts). 



Pupilla muscorum (Liwne). North Fork of Clear Creek, Johnson 

 County, Wyoming (Betts). 



Vallonia cyclophorella Ancey. North Fork of Clear Creek, John- 

 son County, Wyoming (Betts). 



Euconulus fulvus alaskensis Pils. North Fork of Clear Creek, 

 Johnson County, Wyoming (Betts). 



Pyramidula cronkhitei anthonyi Pils. North Fork of Clear Creek, 

 Johnson County, Wyoming (Betts). 



Succinea avara Say. Ten miles northeast of Basin, Wyoming 

 (Walker). 



A NEW OREOEELIX FROM COLOEADO. 



BY JUNIUS HENDERSON. 



In THE NAUTILUS, Vol. XXVI, p. 30, Dr. Pilsbry has indicated 

 that the forms of Oreohelix from Glenwood Springs and Newcastle 

 which have been tentatively recorded and distributed ad 0. haydeni 

 gabbiana (Hemp.) are not gabbiana at all, but are forms of 0. hen- 

 dersoni Pils. I have examined a large series from each place, and 

 have compared them with a large series of typical hendersoni. The 

 characters distinguishing the specimens from Newcastle and Glen- 

 wood from true hendersoni are so constant as to clearly entitle them 

 to a separate name, and yet the relationship, in spite of the lack of 

 intergrading specimens, is so evident it seems best to consider them 

 a subspecies rather than a distinct species. 



OREOHELIX HENDERSONI DAKANI n. subsp. 



Distinguished from typical hendersoni by the following shell char- 

 acters : Spire much more elevated ; peripheral angulation of the 

 earlier whorls disappearing on the penultimate whorl, so that 

 scarcely a trace of it is observable in front of the aperture on the 

 last whorl of the adult shell ; shell larger, whorls higher in proportion 

 to width, producing a corresponding difference in shape of aperture. 



Alt. 14, diam. 22, whorls 5. 



Types in University of Colorado Museum, cotypes in Academy of 



