QUADRUPEDS. 193 



(B.) Enamel superficial. Four grinders. 



84. HisTRix. Porcupine. Body covered with prickles. 

 Tongue covered with spines. Five fingers and four toes. 

 The species H. prehensilis and Jasciculata having long 

 prehensile tails, may be separated from the H. cristata and 

 dorsata. 



85. Castor. Beaver. Body covered with hair. Tail 

 oval, depressed and covered with scales. Five fingers and 

 toes, the latter webbed. One opening for the sexual ori- 

 fice and anus, thus making an approach to the monotre- 

 matous animals. C. Fiber, Lin. 



2. Destitute of incisors. 



The animals of this division are termed Edentes by 

 CuviER, although, in some of the genera, both tusks and 

 grinders exist. Their toes and fingers are armed with 

 very strong claws. They are slow in their motions. 



Furnished with grinders. 



Furnished with tusks. Tardigrada. The toes are con- 

 cealed in the skin. 



86. Bradypus. Sloth. Face short. Grinders cylin- 

 drical. Tusks pointed and long. The stomach is divided 

 into four pouches, with simple walls. Intestine short, and 

 without a coecum. There are two species, B. tridactylus 

 or Ai, and didactylus or Unau, both natives of South 

 America. 



87. Prochilus of Iliger. Snout lengthened. Six 

 grinders in each jaw. Five nails on each foot. Lips and 

 tongue extensile. There is only one species known, F. ur- 

 sinus, an accurate representation of which is given in 

 Bewick's Quadrupeds, immediately after the figure of the 

 brown bear. 



No tusks. Snout produced. 

 a. Grinders simple, 

 vol,. II. N 



