70 



toure'e de fauve ; ce n'est selon M. Tetnminck, qu'une vari^t^ resultant 

 de ce que des longs polls de ses epaules sont uses." — Cuvier, Reg. 

 Anim. ed. 2, p. 225. 



Desmarest describes it in nearly the same words, but he notices 

 four varieties, including amongst them S. crinitus (var. c.) ; the spe- 

 cial description of the species and var. b. appear to be A. gularis ; 

 var. a. appears to be from a female, and var. d. from a male of A. 

 flaccidus. 



Knorr (Delices, i. 97. t. K. f. 3) figures the foetus of a species of 

 this genus. 



a. Fur moderately rigid ; the back white-spotted; dorsal streak 



elongate. 



1 . Arctopithectjs gularis. 



{Lower jaw, Mammalia, PI. XI. f. 6.) 



Dark grey-brown ; back white varied, with an elongated black 

 streak, with a broad patch of soft yellow hair on each side between 

 the shoulders. Skull with a broad forehead, rather convex over the 

 back part of the orbits. The upper front grinder rather large. The 

 hinder side of the lower jaw concavely cut out, and with the lower 

 angle slender and acutely produced ; front of the lower jaw flat, not 

 keeled up the suture. 



Bradypus gularis, Riippell, Mus. Senckenb. iii. t. 11. 



Ai a dos brule, Bufon, Hist. Nat. xiii. 62. 



Ai adult, Bufon, Hist. Nat. xiii. t. 6. 



B. tridactylus, Griffith, A. K. iv. 271. 



B. tridactylus, description and var. b. Desm. Mamm. 



D'Ai B. tridactylus, var. Cuvier, Reg. Anim. Ulust. Matnm. t. 70. 

 f. 1. 



A. tridactylus, var. Cuvier, Oss. Foss. v. t. 5. f. 1, 2, 3, skull; cop. 

 Cuv. R. A. Ed. lUust. t. 70. f. 1 a. 



B. tridactylus /3, Fischer, Syn. 387. 

 Hab. Bolivia, Bridges ; Guiana, Riippell. 



This species was well-described by Buffon, and is at once known by 

 its dark colour, white varied back, and the yellow patch of soft hair 

 between the shoulders. 



Cuvier states (Beg. Anim. ed. 2) that M. Temminck thought that 

 the yellow spot on the back depended on the skm bemg worn m that 

 part. Probably he never saw a specimen, or he could hardly have 

 made such an observation. 



According to Mr. Waterhouse, Mr. Bridges considers the specimens 

 here described as the males of A. marmoratus. 



Cuvier's upper figure of the skull (fig. 1) most accurately represents 

 the form of the hinder end of the lower jaw, the other figures being 

 distorted by the perspective position. 



The skull from which the end of the lower jaw is figured was from 

 an adult animal. There is also the skeleton of a young specimen 

 from the same locality in the Museum collection, which only differs 

 in the coronoid process being less developed. There are two speci- 



