532 



MANUAL OF ZOOLOGY 



elongated snout, with the mouth as a small aperture at its 

 extremity, small eyes, and the auditory pinna sometimes 

 small, sometimes well developed. There are five digits in 

 the fore-foot, of which the third has always a very large, 



Fig. 320. -— Unau, or two-toed sloth {Cholcepus didactylus) . 



(After Vogt and Specht.) 



curved, and pointed claw, rendering the manus an efficient 

 burrowing organ. The toes of the hind-foot, four or five in 

 number, are sub-equal and provided with moderate-sized 



