CHAP. XVI.] 



SOME OTHER MAMMALS. 



281 



In the latter the hinder parts of the Hemispheres are 

 notably expanded, and the anterior lobes are larger in 

 all their dimensions. In this convolutional plan, as the 

 figures borrowed from Owen's ' Anatomy of the Verte- 

 brates ' show, the primary convolutions of the two halves 

 of the Cerebrum converge from behind forwards, as far 

 as the anterior third of the Cerebral Hemispheres and 

 thence diverge in different directions.* 



3 



r 



FIG. 93. Brain of the Rock Coney, 

 side view. 



FIG. 94. Brain of the Giraffe, 

 side view. 



Starting from another small form, the Pigmy Chevrotain 

 (Tragulus), we may find a similar convolutional develop- 

 ment attaining to higher types of the same general pattern 

 in the Stag (fig. 91), the Sheep, the Ox, the Giraffe 

 (figs. 92, 94), the Camel, the Hippopotamus and the 

 Elephant (fig. 95). The greater convolutional complexity 

 of the brain in these larger forms is represented in detail, 

 as Owen has pointed out, by the fuller development of the 

 ' primary fissures/ by their more sinuous course, and by 



* The letters and numerals in the several figures are always the 

 same for corresponding Convolutions and Fissures, and this will 

 materially assist the reader in his comparison of the different 

 forms. The explanations of these references are given by Owen 

 (loc. cit., vol. iii. pp. 136, 137), where the Fissures and Convolutions 

 of Mammalia are enumerated mainly in their order of constancy. 

 Many outline figures of the Cerebral Convolutions of other ani- 

 mals will likewise be found in this work. 



