AGRIOLIMAX L/EVIS CAMPESTRIS. 135 
Var. tristis Cockerell, op. cit. 
ANIMAL very dark-brown or brown-black. This form, which in its colouring is 
nearly allied to var. hyperborea, is found chiefly at high elevations in the mountains. 
The effect of living under the extreme conditions found at high altitudes upon 
the pigmentation of this species, is shown by the darkest forms being most prevalent 
in the highest elevated localities, and is corroborated by the dark colour of the var. 
hyperborea, found on the Arctic shores of Siberia and North America, 
Colorado—A. campestris var. tristis, Lake Co.; Summit Co. ; and Delta Co. 
(T. D. A. Cockerell, Nautilus, Jan. 1890, p. 100). 
Var. hyperborea Westl., Nachricht. Deutsch. Mal. Ges., Sept. 1876, p. 97. 
Limax hyperboreus Westerlund, op. cit. 
30pDyY firm, black above, sides paler, pale beneath, 
back convexly rounded, narrowing behind, tail short, 
compressed and subcarinate above; SHIELD broadly « 
rounded behind, thicker and much wider in front, inner 
margin reflexed. Long., 10 mill. ; lat., 3 mill. 
INTERNALLY, it is described by Binney as possessing Fic. 151.—Median, lateral, 
a smooth arched jaw, with a blunt median projection ; aud mareiah tect of Limax 
RADULA with a formula of 42+1442 teeth, the centrals  22e7o7eus, ughly magnified 
tricuspid; laterals twelve in number and bicuspid; mar- : 
ginals about thirty, simply aculeate or with a bifurcation or side-spur. 
Siberia—Nordenskiéld and Stuxberg found it at Goroschinskoj, 66° 17’ north 
lat., on Sept. 10, 1875; and on the island Sopotschnoj, in the Jenissei river, 70° 5’, 
on Aug. 29, 1875 (Westerlund, op. cit.). Dr. Theel collected it at Tolstoinos, Aug. 
1876, and according to Westerlund it is recorded as Arion ater by Gerstfeldt from 
Eastern Siberia (id., Siber. Land Sotvatt. Moll., pp. 102 and 110). Dr. Dall also 
records that it was found by Stejneger and by the Vega Expedition on the Com- 
mander Islands. It is said to be tound also in Kamschatka (Proc. U.S. Nat. Mus., 
1886, p. 217). Tschukschis Peninsula (Simroth, Portug.-Azor. Fauna, 1891). 
Nearctic Region—Found throughout the Arctic shores of North America, and 
on the Aleutian and Behring Islands (Dall, op. cit.). 
Labrador—Not uncommon on May 16th, 1883, and July 23rd, 1884, under stones 
in moist places in willow thickets, ete., about Fort Chimo, Ungavo Bay (Dall, op. 
cit., p. 203). 
United States—Quincey, California, 1889, H. F. Wickham (T. D. A. Cockerell, 
J. of Mal., 1897, p. 4). 
Fic. 152.—Banks of Leeds and Liverpool Canal, near Kirkstall, a favourite locality for 
Agriolimax levis (photo. by Mr. R. Mackay). 
