1903.] BRAINS OF MONKEYS, 19 
note) that this state of affairs is not universal in Cynocephalus ; 
but it has still got to be proved that it is universal in Cyno- 
pithecus, 
Text-fig. 7, 
Lateral view of brain of Cynopithecus niger. 
&, inferior temporal fissure; co, collateral; P, parallel. 
Other letters as in text-figs. 2, 3. 
Text-fig. 8, 
Longitudinal median section of brain of Cynopithecus niger, 
Letters as in text-fig. 4. 
The collateral swlews, as compared with that of the Macaques 
and Cercopitheci, is particularly well developed. It has, so to 
speak, taken advantage of the feeble development of the inferior 
occipital to thrust itself forward upon the occipital lobe, where it 
is plainly visible when the brain is viewed from behind; it is also 
visible where it curves upwards upon the lateral aspect. It is 
the rule among Monkeys for this fissure to be largely concealed 
by the cerebellum. Its exposure for its whole length in Cyno- 
pithecus appears to me to be a characteristic feature of the brain 
of that monkey, 
Oo 
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