120 



ANATOMY OF VEKTEBRATES. 



a general disposition, converging from behind forward as far as 

 the anterior third of the cerebrum, and thence diverging, but in 

 different degrees.' 1 Both Artiodactyle and Perissodactyle orders 

 include species as small as a rabbit ; yet the Pigmy Chevrotain 



Horizontal section of cerebral hemispheres, Delphinus. xxxix". 



(Tragulus, fig. 101) and the Rock-Coney (Hyrax> fig. 96) alike 

 manifest the essential gyrencephalous characters in the extent 

 to which the cerebrum (prosencephalon) covers the cerebellum, 

 and the degree in which its surface is folded: both, likewise, 



Upper surface of brain, Hyrax. 



Horse. Rhinoceros. 



Upper surface of right hemisphere. 



manifest the Ungulate convolutional pattern, albeit exemplified 

 in the simplest measure by them in their respective groups. 

 The brains of both Tragulus and Hyrax show the following 



1 v. p. 53. 



