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ON THE ANATOMY OF TUPAIA. 473 
and Macroscelides, as figured by Dr. Peters.* It is broadest a little 
behind its middle, from which it narrows gradually in front, more. 
rapidly behind, so as to be pyriform in general outline when seen 
Fig. 2. 
Brain of Tupaia belangeri ; superior aspect. 
from above. No trace of any convolutions can be detected. The 
olfactory lobes are considerable in size, longer than broad. Each 
hemisphere is very slightly convex from before backwards, its outline 
Fig. 3. 
Brain of Tupaia belangeri ; mid-longitudinal section. 
forming the base of the triangular side view of the organ, the two 
other sides of which are of nearly equal length, so that its deepest 
part is at about its middle. 
The corpus callosum is thin and nearly straight. It continues 
forward to within one-sixth of the length of the hemisphere from its 
* “ Reise nach Mossambique,” 1852, pl. xxiv. figs. 10, 12, 13. 
