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Dii. Cunningham—Surface Anatomy of the Primate Cerebrum. 37

diagram (fig. 13). It is present in 15-7 per cent. The gyrus inter-
cuneatus is absent, and the posterior gyrus cuneo-lingualis is on the
surface.

Fig. 13.

S., . "stem," of anterior calcarine
fissure.

P.O., . parieto-occipital fissure.
C, . . fore-part of posterior calcarine
fissure.

ft", . . hinder-part of the posterior-
calcarine fissure.

c, . . gyrus cunei.

a.l., . . deep gyrus cuneo-lingualis anterior
.

p.l., . . posterior cuneo-lingual gyrus on
the surface.

Present in 20 hemispheres, e. in 15-7 per cent.

Eight side, ..........

Left side, ..........

Males, ..........

Females, . . .

Negroes, ..........

Foetuses from eighth month to full time, ....

The next combination is one very similar to the foregoing—the only
difference being the fact that the posterior cuneo-lingual gyrus does not
reach the surface, but is concealed within the calcarine fissure. This was
present in seventeen cases, or in 13'3 per cent. (fig. 14).

15*9 per cent.
15-5 „
17-8 ,,
13-3

50 „
60