65 
Sundevall observes of C. pygargus, “A priori (C. Europeus) non 
minus differt quam omnes Cervi indici inter se ; hi igitur, non minus 
quam ille, distinguendi, sed rectius forsan ut merze varietates ha- 
bendi.”’—FPecora, 61. 
I have seen six specimens of the Ural species, and they were all 
alike, and very distinct from any variety of the European Roebuck I 
have seen, especially in the form of the head and the extension of the 
white disk over the sides of the rump, forming a broad oblong white 
spot ; while in the European species it is an erect longitudinal disk 
only, occupying the back part of the haunches. 
The height at the shoulder of Lord Derby’s specimen is 38 inches. 
His Lordship’s correspondent states, “It was brought to Valparaiso 
by Don Benjamin Munoz, a Commodore in the Chilian Navy. The 
animal was shot by one of the Chileno officers about twenty leagues 
from Port Famine in the Straits of Magellan. The Indians assured 
the officer that there was another similar kind of Deer there, but 
quite white. He did not see any of them, but the other kind (C. /eu- 
cotis) did not seem uncommon.’” 
2. On THE GeNus Brapypus or Linnzus. By Jonn Epwarp 
Gray, Esa., F.R.S. Etc. 
(Mammalia, Pl. X. XI.) 
Illiger, and afterwards F. Cuvier, divided the Linnzean genus Bra- 
dypus into two, according to the number of the claws and the absence 
or presence of the canine, and the form of the crown of the grinders. 
The examination of the collection of skulls of the family in the 
collection at the British Museum, has induced me to believe that the 
recent species may be divided into three very distinct subdivisions, 
and that there are at least seven distinct species. 
Synopsis of Genera. 
1. Cuotaprus.—Hands two-clawed, feet three-clawed; front 
grinder large, like a canine; pterygoid bone rather swollen, sub- 
vesicular, 
2. Brapypus.—Hands and feet three-clawed ; front grinder small ; 
pterygoids swollen, hollow, vesicular. 
3. ARcTorirHEcUS.—Hands and feet three-clawed ; front grinder 
small; pterygoids compressed, crest-like, solid. 
I. Cuote@pvus, Illiger (1811) ; Bradypus, F'. Cuvier, Dent. Mamm. 
t. 77; Bradypus, sp. Linn. ; Tardigradus, sp. Brisson. 
Hands two-clawed, feet three-clawed. Grinders: front upper and 
lower large, like canines; the upper ones separated from the other 
grinders by a broad space, with a deep concavity in front, at the back 
edge of the teeth. Intermaxillary bones small, distinct, and produced 
in front, with a long canal behind them; pterygoid bones separate, 
rather swollen, spread out on the sides, thick, with a moderate internal 
vesicular cavity. 
Lower jaw much-produced in front between the teeth. 
The skull of this genus is well-figured by M. Cuvier, Oss. Foss. v. 
No. CXCIV.—Proceepinés or THE ZooLoGica Society. 
