65 



Sundevall observes of C. pygargns, "A priori (C. Europceiis) non 

 minus diifert quam omiies Cervi indici inter se ; hi igitnr, non minus 

 quam ille, distinguendi, sed reetius forsan ut merse varietates ha- 

 bendi." — Pecora, 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 leu- 

 cotis) did not seem uncommon." 



2. On the Genus Bradypus of Linn^us. By John Edward 

 Gray, Esa., F.R.S. etc. 



(Mammalia, PI. X. XI.) 



Illiger, and afterwards F. Cuvier, divided the Linneean 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 . Cholcepus. — Hands two-clawed, feet three-clawed ; front 

 grinder large, like a canine ; pterygoid bone rather swollen, sub- 

 vesicular. 



2. Bradypus. — Hands and feet three-clawed ; front grinder small ; 

 pterygoids swollen, hollow, vesicular. 



3. Arctopithecus. — Hands and feet three-clawed ; front grmder 

 small ; pterygoids compressed, crest-like, solid. 



I. Cholcepus, Illiger (1811); Bradypus, F. Cuvier, Bent. 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 sej)arated from the other 

 grinders by a broad space, with a deep concavity m 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. — Proceedings of the Zoological Society. 



