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Dr. Cunningham—Surface Anatomy of the Primate Cerebrum. 35

The most frequent deviation from this condition is the absence of
the deep gyrus intercuneatus, which breaks up the parieto-occipital fissure
This occurred in 47 per cent, of the cases examined. The gyrus cunei
is extremely constant. In only 3*1 per cent, was it absent, and of course in
these cases the parieto-occipital fissure ran without let or hindrance into

Fm. 12.

S., . . the "stem."

P.O., . parieto-occipital fissure.

C, . . fore-part of the posterior calca-

rine fissure,
ft", . . hinder-part of the posterior cal-

carine fissure. (The fissura

extrema of Seitz.
i.e., . . deep gyrus intercuneatus.
e.} . . deep gyrus cunei.
a.I., . . anterior deep gyrus cuneo-lin-

gualis.

p.1., . . posterior deep gyrus cuneo-
lingualis.

Present 43 times in 127 hemispheres, i. e. in 33-8 per cent

Eight side,
Left side,
Males,
Pemales,
Negroes,

Foetesus between eight months and full-time,

39 per cent.
27-6
40-3
24-6
20
7

the "stem." The cuneo-lingual gyri are also very rarely absent. The
anterior gyrus was absent in 7S per cent.; and in these cases the fore-part
of the posterior calcarine fissure and the "stem" were directly continuous.
In only 10 per cent, was the posterior gyrus absent so as to render the
two parts of the posterior calcarine fissure absolutely continuous.

[5*]