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1862. ] OF PITHECIA MONACHUS. 329 
The whole of the cerebellum and the olfactory lobes are covered by the 
cerebrum. The length of the cerebral hemispheres is 1*8 inch ; their 
greatest breadth 1:5 inch; their height 1*2 inch. The upper surface 
is arched, the parietal region being well developed. The occipital 
lobes are full and broad, but not much elongated posteriorly, so that 
they scarcely do more than cover the cerebellum in this direction. 
The frontal lobe is depressed, and deeply excavated below ; the tem- 
poral lobe well developed. In general form the cerebrum resembles 
that of some of the Ceéz; it is less pointed in front than the brains of 
most of the Old World Apes, and less elongated and depressed than 
in Nyctipithecus, Callithrix, and Hapale. 'The olfactory lobes are 
smaller than in most of the allied forms. There is nothing calling for 
particular notice in the base of the brain (fig. 2), except that the 
Fig. 1. Fig. 2. 
corpora albicantia are not confluent, and the olivary bodies form 
distinct projections on the medulla oblongata ‘2 inch long. The 
cerebellum is large, the flocculi being particularly well developed. 
* Fig. 3. 
The corpus callosum is *7 inch long; the portion of the ccrebrum 
anterior to it ‘4; that posterior to it *7 inch. 
The outer face of the cerebral hemisphere (fig. 3) is marked by a 
