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De. Cunningham—Surface Anatomy of the Primate Cerebrum. 217

4. That there are sexual differences in the arrangement of the different
parts of the intraparietal sulcus is also possible, as may be noted from the
following Table :—



Vaeiety I.

Variety II.

Variety III.

Variety IV.

37 Adult female hemispheres,

3-1 p. c.

23 p. c.

6-2 p. c.

67-7 p. c.

32 male ,,

10-8 p. c.

16-2 p. c.

19 p. c.

54 p. c.

One or other, or perhaps both, of the postcentral sulci may establish
connexions with the fissure of Rolando. The upper sulcus may run bodily
across the ascending parietal convolution into the Rolandic fissure whilst
the lower sulcus may be connected with it by a secondary branch. I have
seen several cases of this kind, but it is not necessary to describe these

Fig. 44.—Posterior part of right hemisphere of a female 36 years old. It shows the sulcus postcentrals
superior crossing the ascending parietal convolution and joining the fissure of
Rolando.

separately or in detail. In some the superior postcentral sulcus alone was
involved, and it joined the fissure of Rolando at a varying distance from the
upper free margin of the hemisphere (fig. 44). In one case it was almost
entirely absorbed in this way. In other instances not only did the upper
postcentral sulcus run into the fissure of Rolando, but also the lower postcentral
sulcus was joined to it by a cross-branch. In every instance the

KOYATj ibjsh academy.—cunningham memoirs, no. vii. [28]