The ground colour of the shell is white, tending toward pale greyish 

 vinaceous, with specks and mottlings of cacao brown and brownish vin- 

 aceous, the whole merging to sorghum brown on the apex. There are 

 weak traces of three major brownish-vinaceous bands, and several basal 

 minor ones, the uppermost of the former being traceable well up the 

 spire. 



The embryonic shell is sculptured by weak radial wrinkles, which 

 gradually develop into a fine, rather irregular ribbing, but any spiral 

 sculpture originally present is eroded to the merest trace in the specimen 

 seen. 



Measurements. Maximum diameter of type, 19- 1 ; minimum diameter, 

 16-2; altitude, 11-5; diameter of umbilicus, 3-5 mm.; number of 

 whorls, 5|. 



Type: Victoria Memorial Museum Collection, Cat. No. 2882. 



Type Locality : Columbia River valley, west of Rocky mountains, Donald 

 Station, B. C.; (J. B. Tyrrell, Sept. 21, 1883?); 1 specimen. 



Remarks. This demure mountain snail is of plain appearance, offers no 

 very striking peculiarities, and yet seems incapable of reference to any of 

 the races or subspecies heretofore recognized. The shell characters seem 

 about as conclusive as such things can be in Oreohelix, that it belongs to 

 the typical group of 0. strigosa, and here possibly closer to Hemphill's 

 parma from northern Washington than to anything else. From the latter 

 it is readily distiaguishable, however, by its much narrower umbilicus and 

 smaller size. 



In any event the shell is of interest as carrying the strigosa-group of 

 Oreohelix north of the United States border for the first time. The typical 

 strigosa is said to come from the "Interior of Oregon", but its various sub- 

 species extend south through Idaho, Utah, and Colorado, to Arizona and 

 New Mexico. It is very doubtful whether the 0. alpina of Elrod, from 

 the Mission range, Montana, belongs in the same species-series. In fact 

 specimens neither of the true strigosa nor of any of its subspecies seem yet 

 to have been discovered in Montana. They have been so reported several 

 times, but seem generally referable to some form of cooperi. 



Definite record in the matter seems to be lost, but there is reason to 

 believe that the unique specimen of canadica was collected by J. B. Tyrrell, 

 who visited Donald, September 21, 1883. 



Gonyodiscus cronkhitei (Newcomb 1865) 



1865. Helix cronkhitei Newcomb, Proc. Cal. Acad. Nat. Sci., vol. 3, p. 



180. 



1866. Patula cronkheitei Tyron Am. Jour. Conch., vol. 2, p. 263. 

 1885. Patula striatella (pars) Binney Man. Am. Landsh., p. 70, f. 30. 

 1893. Patula striatella Taylor, Nautilus, vol. 7, pp. 86 (recorded from 



Laggan, Alberta). 

 1895. Patula striatella Taylor, Ottawa Nat., vol. 9, pp. 176, 177 (recorded 



from Macleod and Little Bow river, Alberta). 



1898. Pyramidula striatella (pars) arid P. striatella cronkhitei Pilsbry, 

 Nautilus, vol. 11, p. 141. 



