553 
which they might even be stated slightly to project. The inferior 
vermiform process was lodged in a slight furrow between the two 
cerebellar hemispheres. 
In the brains of several specimens of Cercopitheci, the tentorial 
and occipital surfaces, with the posterior margin of the cerebellum, 
were distinctly marked. In all, the posterior cerebral lobes extended 
over the tentorial surface as far as the posterior margin. In two of 
the brains, it might be stated that the cerebral lobes projected back- 
wards beyond that margin. The comparatively greater development 
of the inferior vermiform process, over the lateral hemispheres of the 
cerebellum, was indicated by the absence of that fossa between the 
hemispheres in which it lies in the more highly developed human 
cerebellum. 
In a Macacus, a vertical section through the skull and brain of 
which animal I examined, the cerebrum corresponded to the ten- 
torial aspect of the cerebellum ; the posterior lobes of the one and 
the superior surface of the other extended as far as the margin of 
attachment of the tentorium to the transverse line of the occiput. 
In two specimens of Cynocephali, the same relation of the posterior 
lobes of the cerebrum to the tentorial aspect of the cerebellum was 
observed. In neither of these brains was the inferior vermiform 
process lodged in a depression between the hemispheres, but formed 
an almost continuous surface with them.* 
In three brains, from animals of the genus Ateles, the posterior 
cerebral lobes extended quite up to the posterior margin, separating 
the tentorial from the occipital surface of the cerebellum. In all 
the lateral hemispheres projected slightly beyond the inferior vermi- 
form process, which was lodged in a shallow depression between 
them. 
In a lion monkey ( Midas leoninus) the occipital surface of the 
cerebellum was separated from the tentorial by a very clearly defined 
* Since this paper was read before the Society, I have dissected in situ the 
brain of a young Shacma, and have found that the cerebrum projected beyond 
the cerebellum, both laterally and posteriorly. The vermiform process pro- 
truded slightly beyond the cerebellar hemispheres. The projection of the cere- 
bral hemispheres backwards beyond the worm was rather less than i%ths of an 
inch, whilst on each side of the worm it extended to rather more than -j^ths of 
an inch behind the cerebellar hemispheres. The cerebellar and posterior cere- 
bral fossae in the cranium exhibited an arrangement in conformity with this 
disposition of the encephalon. ( March 27th.) 
