Page 307. 
476 ON THE ANATOMY OF HELICTIS. 
The brain conforms to the Mustéline Carnivorous type, not to that 
of most of the Arctoidea. In Prof. Flower’s excellently concise defini- 
tions of the three different arrangements of the cerebral convolutions 
in the Carnivora,* he tells us that “in the Arctoidea the fissure of 
Sylvius is rather long, and slopes backwards; the inferior gyrus has — 
the limbs long, corresponding with the length of the Sylvian fissure, 
the anterior rather narrower than the posterior (especially in the true 
Bears) ; the middle gyrus is moderate and equal-limbed, the upper 
one large, very broad in front, and distinctly marked off from the second 
posteriorly as far as near the lower border of the temporal lobe ({). 
The crucial fissure is long and oblique, and situated further back than 
usual.” In the footnote ({) we read, “ Except in the smaller num- 
bers of the genus Mustela, where the sulcus separating the superior 
from the middle gyrus is less produced posteriorly than in others of 
the group. In Galictis vittata, however, the brain is quite a miniature 
of that of a Bear; but the middle convolution is united with the upper 
one at its superior anterior angle.” 
Fig. 2. 
Brain of Helictis subaurantiaca ; lateral aspect. 
* “Proceedings of the Zoological Society,” 1869, p. 482. 
