“ 
306 Mr. R. I. Pocock on the Tooth-change, 
strongly contrasted dark and light, the dark line along its 
upper side narrower and with less black in it. 
Skull with the posterior nares narrowed and closed in to a 
sharp angle, level with the front edge of the pits in the para- 
pterygoid fossee, just as in cuniculo(des and hatcher?, not as 
in typicus. Colour of incisors darker than in cunieulotdes. 
Dimensions of the type (measured in flesh) :— 
Head and body 145 mm. ; tail 85; hind foot 29; ear 23. 
Skull: greatest length 35:5; condylo-incisive length 32°6 ; 
zygomatic breadth 19°8 ; nasals 15; palatilar length 16°8 ; 
palatal foramina 9; postforaminal palate 7; upper molar 
series 6°7, 
Hab. Southern pampas of Buenos Ayres ieegeaee Type 
from Peru, F.C.P., about 200 kilometres N.W. of Balia 
Blanca. 
Type. Young adult male. B.M. no. 13. 11.1.1. Ori- 
ginal number 3. Collected 20th July, 1913, and_presented 
by F. H. F. Parkes, Esq. Three specimens. Others ob- 
anak by A. W. Whyte and W. A. Smithers. 
This seems to be the northern representative of the 2. cuni- - 
culoides of Patagonia, differing from R. typicus of Uruguay 
and Corrientes by more essential characters than any that 
separate the southern forms from each other. On this account 
I should consider hatchert also asa subspecies of cuniculoides, 
although I confess J have not for comparison modern topo- 
types of the latter. But, according to the describer of 
R. hatchert, the differences are mainly in colour. 
XXXVI.—On the Tooth-change, Cranial Characters, and 
Classification of the Snow-Leopard or Ounce (Felis uncia), 
By R.I. Pocock, F.R.S., Superintendent of the Zoological 
Society’s Gardens. 
Tuts paper is based mainly upon a series of skulls in the 
collection of the Zoological Society. Two of the series are 
those of the snow-leopard or ounce (Felis uncia), whose 
cranial characters have never been fully described, so far 
as I am aware. The animals themselves lived only a few 
months in captivity. Hence the features the skulls 
present may be regarded without hesitation as normal. 
Neither animal was mature, and since by chance these 
skulls show very clearly the successive steps in the tooth- 
change, an account of that process may be interesting. Of 
greater interest, however, are certain characteristics shown 
