CHOLOEPUS. 



BRADYPUS. 



21 



Measurements. Total length about 700 (mounted specimen). 

 Skull: total length, 101.5; palatal arch to incisive foramina, 35; 

 zygomatic width, 64; interorbital constriction, 34; across postorbital 

 processes, 53 ; mastoid width, 45 ; length of nasals, 37 ; length of upper 

 tooth row, 23.5; length of mandible, 77; height at condyle, 22; at 

 coronoid process, 28; length of lower tooth row, 21. 



FIG. VI. CHOLOEPUS HOFFMANNI. HOFFMANN'S SLOTH 



. 



Hradypus. 



' = 18. 



44 



Bradypus Linn., Syst. Nat., i, 1758, p. 34. Type Bradypus tri- 



dactylus Linnaeus. 

 I^navus Frisch, Nat. Syst. vierfiiss. Thiere, in Tabellen, Tab. Gen. 



1775- 

 Arctopithecus Gray, Proc. Zool. Soc., 1871, p. 446. 



Arms longer than legs; bones of forearm free; three digits on 

 hand, and three toes on foot, terminating in pointed claws forming 

 a hook; both hands and feet are very narrow and the claws cannot 



