BRAIN OF MAMMALIA. 



19 



volume, proportionately to the mass of the brain, than is found either in 

 Man or the Chimpanzee. Descending lower in the scale, we at last arrive at 



the marsupial group, of two animals of which, the brains are here repre- 

 sented. That of the Kangaroo (fig.6) shews the cerebral hemispheres (a, a) ; 

 not, perhaps, so much diminished in bulk as narrowed anteriorly, and 

 almost destitute of convolutions on their surface. The cerebellum (6, 6,) 



