8 
1898. Pyramidula ( striatella ) cronkhitei Pilsbry, Nautilus, vol. 12, pp. 85- 
86 . 
1905. Pyramidula cronkhitei Dali,- — Land and Freshwater Moll. Alaska, 
pp. 9, 50. 
Material Examined 
No. of 
spec. 
Locality 
Collector 
Date 
Geol. Surv. 
Cat. No. 
1 
Wigwam river, B.C. 
J. B. Tyrrell 
July 25, 1883... 
2878 
3 
Swamp near W 7 aterton lake, B.C 
Aug. 28, 1883.. 
“ 25, 1883... 
1885. . . 
2877 
10 
Waterton lake, B.G. 
ft 
2876 
17 
Morley, Alberta 
J. Macoun 
2934 
99 
Kananaskis, Alberta 
1885... 
ex-2937 
Dali (1905, p. 50) referred all his Albertan and British Columbian 
montane forms to striatella ( = anthonyi Pilsbry) , his British Columbian coastal 
forms to cronkhitei. Vanatta (1906, p. 95) likewise has reported anthonyi 
from Field and Banff. Nevertheless, since it is difficult to defect depend- 
able differences, other than perhaps their rather consistently smaller size, 
between the shells from the Canadian Rockies and those from Montana, 
Colorado, and other more southern localities which are usually referred with- 
out much question to cronkhitei , it is probably advisable for the present to 
call them all cronkhitei s.s., rather than attempt their reference to the 
eastern subspecies, anthonyi. When even so competent an authority as 
Pilsbry has within a few years allocated the same Arizona shells to both 
anthonyi and cronkhitei , a less experienced student is not likely to feel infallible . 
The truth is, we do not know the real boundaries of the distribute nal 
areas of either form, or even whether any clear-cut limits either in shell 
characters or in distribution actually exist. Thorough and critical study 
of an abundance of material will alone enable the precise identification of 
particular specimens. The following table briefly summarizes the results 
of a comparison of specimens from various localities with material of anth- 
onyi from Unity, Maine. 
