1882.] MR. W.A. FORBES ON THE GREAT ANTEATER. 293 
sions 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, 
Fig. 3. 
Fig. 4. 
The same, from the inside. All these figures are of the natural size. 
a, Limbic fissure, inferior are of (Broca); 4, fissure of Rolando (Broca) ; 
¢, primary parietal sulcus ; d, e, additional sulci of cireumsylvian gyrus ; 
s, fissure of Sylvius; J.s.s, island of Reil (lobule sous-sylvien, Broca) ; 
em, cm’, ¢.m', calloso-marginal sulcus (superior are of limbic fissure, 
Broca); , hippocampal sulcus; a,c, anterior commissure ; opt, optic 
nerve; 7.1 (fig. 4), “ Pli de passage rétro-limbique ” (Broea); + (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 
