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ORIGINAL ARTICLES. 
Fig. 1 . Cast of the interior of the skull of the Siamang (Hylobates syndactylus ), 
adult male. 
F. Frontal lobe of cerebrum. 
P. Parietal lobe. 
T. Temporal lobe. 
O. Occipital lobe. 
01. Olfactory lobe. 
C. Cerebellum. 
Fig. 2. Cast of the interior of the skull of the Chacma Baboon (Cynocephalus 
porcarius ), adult male. The dotted line indicates the outline of the cavity 
which lodges the olfactory lobes. 
