11 
Mixed in the same lot with these specimens were a considerable num- 
ber of G. cronkhitei of all ages and sizes, but. even down to the very small 
ones the present species was fairly easy to separate out by reason of its 
narrower and steeper walled umbilicus, nearly smooth base, and finely, 
rather than coarsely, ribbed upper surface. Shimekii is also lighter in 
colour and distinctly larger when adult. 
Helicella (Retinella) hammonis (Strain 1765) 
1765. Helix hammonis Strt/)m, — Trond. Selsk. Skr., vol. 3, p, 435, pi. 
6, f. 16 (teste Taylor). 
1805. Helix nitidula var. (3 Draparnaud, — Hist. moll. France, p. 117, pi. 8, 
f. 21-22 (teste Taylor). 
1830. Helix radiatula Alder, — Trans. Nat. Hist. Soc. N. Durh. etc., vol. 1, 
p. 38, No. 30 (teste Taylor). 
1830. Helix radiatula Alder, — Cat. Test. Newcastle upon Tyne, p. 12, 
No. 50 (teste Dali). 
?1830. Helix viridula Menke, — Syn. Meth., ed. 2, p. 127 (teste Binney). 
1841. Helix electrina Gould, — Inv. Mass., p. 183, f. 111. 
1864. Iiyalina electrina Morse, — Jour, Portl. Soc. Nat. Hist., vol. 1, p. 13, 
text f. 23, pi. 6, f. 24. 
1869. Hyalina viridula Binney and Bland, — Land and Freshwater Sh. N. 
Am., I, p. 34, f. 41-43. 
1884. Hyalina pellucida Lehnert, — Sci. Rec., vol. 2, p. 172 (teste Dali). 
1885. Zonites virdulus Binney,— Man. Am. Landsh., pp. 23, 27, 28, 32, 
36, 57, 64, 201, 202,-203, 223, 478, f. 21-22. 
1893. Hyalina radiatula Taylor, — Nautilus, vol. 7, pi. 86 (recorded from 
Laggan, Alberta). 
1897. Hyalinia hammonis Westerlund, — Syn. Moll. Extram., p. 34 (teste 
Taylor). 
1898. Vitrea hammonis Pilsbry, — Nautilus, vol. 11, p. 129. 
1905. Vitrea radiatula Dali, — Land and Freshwater Moll. Alaska, pp. 8, 
14,38. 
1906. Vitrea hammonis Walker, — Moll. Mich., I, p. 477, f 42 (after Binney). 
1906. Vitrea hammonis Vanatta, — Nautilus, vol. 20, p. 95 (recorded from 
Field, B.C.). 
1908. Hyalinia radiatula Taylor, — Land and Freshwater Moll. Brit. 
Isles, p. 87, text f. 129-134, 145, pi. 2, 4th fig. 
1908. Hyalinia radiatula electrina Taylor, — id., p. 97, text f. 139-145. 
1921. Helicella ( Retinella ) radiatula Glide and Woodward, — Proc. Malac. 
Land., vol. 14, pp. 177,185. 
Material Examined 
No. of 
Geol. Surv. 
spec. 
Locality 
Collector 
Date 
Cat. No. 
15 
Kananaskis, Alberta 
J. Macoun. 
1885 
2933 
1 
Waterton lake, Alberta 
J. B. Tyrrell 
1883 
2875 
3 
Morley, Alberta 
J. Macoun 
1885 
ex-2932 
