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De. Cunningham—Surface Anatomy of the Primate Cerebrum. 25

or not; but a series of deep, transverse, gaping fissures are seen on the basal
aspect of the hemisphere, cutting into the temporal and occipital lobes.

Fig. 9.—Brain showing a series of abnormal transverse fissures on the under surface of
the temporal lobes. From a photograph supplied by Prof. V. Horsley.

These abnormal incisions I regard as being produced by a retention of
the temporary fissures of the early foetal brain.

Although it has no direct connexion with what goes before, I may
as well mention at this stage that in the course of my examination of
the series of specimens in the museum of University College, London,

Fig.10. Fig. 11.

I met with a very remarkable deformity in the posterior part of
the right cerebrum of a foetus between the third and fourth month. A
hollow outgrowth projected backward over the mesencephalon, upon the

KOYAL IRISH ACADEMY.-CUNNINGHAM MEJIOIBS, NO. Til. [4]