12 
It is thought best to include a considerable fragment of the very in- 
volved synonymy of this species because agreement is far from general as 
to the correct name and for lack of the essential literature the author is not 
in a position to form an intelligent opinion of his own. The name hammonis 
is chosen chiefly in deference to the authority of Pilsbry and Vanatta. 
The generic name is that adopted by Gude and Woodward, the most recent 
writers on the subject. 
The Kananaskis specimens are rather small for the species. The 
Waterton Lake specimen is somewhat reminiscent of P. binneyana , which 
has been found nearby in Montana, but has the narrower umbilicus of 
hammonis. 
Zonitoides arborea (Say 1817) 
1817. Helix arboreus Say, — Nicholson’s Encycl., 1st Am. Ed., pi. 4, 
f. 4. 
1841. Helix arborea Gould, — Inv. Mass., p. 182, f. 110. 
1864. Helix breweri Newcomb, — Proc, Cal. Acad. Nat. Sci., vol. 3, p. 118. 
1864. Hyalina arborea Morse,- — Jour. Portl. Soc. Nat. Hist., vol. 1, p. 14, 
text f. 28, pi. 6, f. 29. 
1869. Hyalina arborea Binney and Bland, — Land and Freshwater Sh. 
N. Am., I, p. 33, f. 38-40. 
1885. Zonites arboreus Binney, — Man. Am. Landsh., pp. 19, 23, 30, 31,32, 
35, 57, 61, 65, 179, 201, 202, 203, 356, 388, 478, f. 13-14, 211, 214. 
1893. Hyalina arborea Taylor, — Nautilus, vol. 7, p. 86 (recorded from 
Laggan, Alberta). 
1898. Zonitoides arboreus Pilsbry, — Nautilus, vol. 11, p. 131 (merely 
catalogued) . 
1905. Zonitoides arboreus Dali, — Land and Freshwater Moll. Alaska, 
pp. 8, 14, 42. 
1906. Zonitoides arborea Vanatta, — Nautilus, vol. 20, p. 95 (recorded 
from Field, B.C.). 
1906. Zonitoides arborea Walker, — Moll. Mich., I, pp. 483, 484, f.55, 56, 58 
(after Binney). 
Material Examined 
No. of 
spec. 
Locality 
Collector 
Date 
Geol. Surv. 
Cat. No. 
31 
Morley, Alberta 
J. Macoun 
1885 
2932 
13 
Kananaskis, Alberta 
1885 
ex-2937 
7 
Waterton lake, Alberta. v 
J. B. Tyrrell 
Aug. 25, 1883..., 
2874 
Petasina fulva alaskensis (Pilsbry 1899) 
1885. Zonites (Conulus) fulvus Binney (pars), — Man. Am. Landsh., pp. 20, 
23, 25, 27, 28, 32, 36, 57, 67, 201, 203, 354, 479. 
1893. Conulus fulvus Taylor, — Nautilus, vol. 7, p. 86 (recorded from 
Laggan, Alberta). 
