352 



ANATOMY OF VERTEBRATES. 



shows. The range of variety, for which allowance may be made, 

 is noted in the Ox and Sheep. 



Table of the Times of Appearance of the Permanent Teeth in the Ox, 



Sheep, and Hog. 



C. Perissodactyla. — The Horse is selected as the first example of 

 the dentition of the hoofed Quadrupeds with toes in uneven number, 

 because it offers in this part of its organisation some transitional 



280 



Dentition of Horse (Equus). 



features between those of the dental characters of the typical 

 members of the artiodactyle and of those of the perissodactyle 

 Ungulata. 



All the kinds of teeth are retained, in nearly normal numbers, 

 in both jaws, and with almost as little unequal or excessive de- 

 velopment as in the Anoplothere ; but the prolongation of the 

 slender jaws carries the canines, figs. 280, c, and incisors, ib. i, to 



