CHOLOEPUS. $ BRADYPUS. 21 
Measurements. Total length about 70o (mounted specimen). 
Skull: total length, ror.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, 2r. 
Fic. VI. CHOLOEPUS HOFFMANNI. HOFFMANN’S SLOTH 
%. Bradypus. 
S$ — 78. 
4—4 
Bradypus Linn., Syst. Nat., 1 
dactylus Linneus. 
Ignavus Frisch, Nat. Syst. vierfiiss. Thiere, in Tabellen, Tab. Gen. 
1775; 
Arctopithecus Gray, Proc. Zodl. Soc., L87t, ps 446, 
, 1758, p. 34. Type Bradypus tr- 
Arms longer than legs; bones of forearm free; three digits on 
hand, and threé toes on foot, terminating in pointed claws forming 
a hook; both hands and feet are very narrow and the claws cannot 
