254 Geological Society. 
The skull is larger and proportionately longer than in 
rupestris, smaller than in mantchuricus, stouter and broader 
in the region of the nasals than in colatus. 
Colour.—In summer the upper parts, including the tail, 
black or brownish black ; chin, muzzle, and face greyish ; 
lips, legs, feet, and flanks rufous; belly, chest, throat, and 
inner surface of fore legs white. Of the four specimens 
secured all showed this colouring, in one the upper parts 
being pure black and the rufous of the flanks and legs very 
bright. It may thus be argued that the black colouring in 
this form is a fixed character, and not recurring melanism, as 
in the Saghalin rupestris, in which there are sometimes red 
summer individuals, many pure black ones with only a little 
rufous about the ears, and a large number of individuals that 
are intermediate in colour. All specimens taken in the Tung 
Ling that I have heard of have been described as black. The 
winter pelage, judging from skins seen in Peking, appears to 
be pure dark grey. 
Measurements of type :— 
Head and body 235 mm.; tail 200; hind foot 62; ear 32. 
Skull: greatest length 55; basilar length 42°5; length of 
true molar series 7. 
Habitat. Wu-ling-shan, in the Tung Ling area, 75 miles 
N.E. of Peking, Chihli, N. China. 
Type. A fully-aduit female. U.S. Nat. Mus. no. 219185. 
Orig. no. 1033. Collected by A. de C. Sowerby on 25 Aug., 
1917. Alt. 3500 feet. 
Range. The range of this form appears to be restricted to 
the somewhat limited forested mountainous area known as 
the Tung Ling, formerly a hunting-preserve of the Imperial 
Manchu family. 
PROCEEDINGS OF LEARNED SOCIETIES. 
GEOLOGICAL SOCIETY. 
December 15th, 1920.—Mr. R. D. Oldham, F.R.S., 
President, in the Chair. 
The following communication was read :— 
‘Paleontology of the Tertiary Deposits in North-Western 
Peru.’ By Henry Woods, M.A., F.R.S., T. Wayland Vaughan, 
Ph.D., J. A. Cushman, Ph.D., and Prof. Herbert Leader Hawkins, 
D.Se., F.G.S. 
The fauna of the Negritos Formation is of shallow-water 
eharacter, and consists mainly of gasteropods and lamellibranchs, 
