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Dr. Cunningham—Surface Anatomy of the Primate Cerebrum. 203

to assume the linear form, but, although this is the case, it would appear
that its junction with the main part of the fissure is not so common as in
the baboon. In ten hemispheres the confluence only took place in one.

Fio. 35.—The cerebral hemispheres of a young female chimpanzee as seen from above. The occipital
operculum on each side has been removed. Drawn by the American apparatus for
tracing orthogonal projections of the skull. The brain was adjusted in the apparatus,
so that its occipital end was very much higher than its frontal end, in order that the
parts under cover of the occipital operculum might be introduced into the figure.

r.

. Fissure of Eolando.

p.o. .

. Parieto-occipital fissure.

P-1 ■

. Sulcus postcentrals inferior.

a.n. .

. First parieto-occipital annectant gyrus.

p.* . .

. Two portions of sulcus postcentralis sua
.

. Deep annectant gyrus in the course of the



perior.



intraparietal sulcus.

p* .

. Eanius horizontalis.

c.

. Secondary sulcus in the superior parietal

p.* .

. Ramus occipitalis.



lobule.

b. .

. Terminal bifurcation of the intraparietal

a.f. .

. Bottom of the " Affenspalte."



sulcus, i.e. Ecker's sulcus transversus

0.

. Cut surface of the occipital operculum.



occipitalis.

f.> .

. Parallel sulcus.

When we come to the anthropoid apes we find the union of the sulcus
postcentralis superior with the main furrow much more common. This
appears to be the usual condition in the chimpanzee and the gibbon. In
six hemispheres of the former I find the sulcus postcentralis superior

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