1882.] 



MR, W. A. FORBES ON THE GREAT ANTEATER. 



293 



Bions as its fellow, being more richly convoluted by the development 

 in it of minor fissures and impressions not present in the other. It 

 is that of which the lateral and internal views are here figured (figs. 3, 



Fi^. 3. 



^.A'.J, 



Brain, from the side, of specimen d. 

 Fig. 4. 



The same, from the inside. All these figures are of the natural size. 



a. Limbic fissure, inferior arc of (Broca) ; b, fissure of Eolando (Broca) ; 

 c, primary parietal sulcus ; d, e, additional sulci of circumsylnan gyrus ; 

 s, fissure of Sylvius; l.s.s, island of Eeil {lobule sous-si/lvien, Broca); 

 cm, cm', cm", calloso-marginal sulcus (superior arc of limbic fissure, 

 Broca) ; h, hippoeampal sulcus ; a. c, anterior commissure ; opt, optic 

 nerve ; r.l (fig. 4), " Pli de passage r6tro-limbique " (Broca) ; + (fig. 2), 

 bridging convolution between frontal and parietal lobes. 



4): the description of the main sulci is taken from the simpler 

 specimen (represented in fig. 2), but applies in all essential respects to 

 both. 



The olfactory lobe is separated from the cerebral hemispheres 



