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Dr. Cunningham—Surface Anatomy of the Primate Cerebrum. 213

Rolando and three central convolutions. The hinder of the two transverse
sulci is the result of the complete union of the two vertical limbs of the intra-
parietal sulcus. It is the sulcus postcentrals of Ecker or the sulcus postrolan-
dicus of Pansch divorced from the ramus horizontalis. A thick superficial
bridging convolution which connects the superior parietal lobule and the
supramarginal convolution cuts off the ramus horizontalis completely. No
evidence as to its double nature can be gained by exploring the bottom of

Fig. 41.—Right hemisphere of an adult male (reproduced from a photograph). It exhibits, in a well-
marked form, the condition described as Variety III. of the intraparietal sulcus. The
small oblique furrow in front of i.t. is the inferior transverse sulcus of the intraparietal
(Eberstaller) partially united to the lower end of the sulcus postcentralis inferior.

A. . . Island of Reil. G. . . External parieto-occipital fissure.

B. . . Posterior horizontal limb of the fissure of b and c. . Second and third frontal convolutions.

Sylvius. d. . . Ascending frontal convolution.

C. . . Ascending limb of the fissure of Sylvius. e. and h. Ascending parietal convolution.
F. . . Fissure of Rolando.

this long transverse furrow. It is uniformly deep throughout, and possesses
a depth not far short of that of the fissure of Rolando. Its walls interlock
through the presence of numerous secondary gyri, but there is no trace of
a bridging convolution.*

* A condition of the intraparietal sulcus similar to this was described by Luys, " Description
d'unc circonvolution supplemental signalee dans certains cerveaux humaine, "Gaz. d. Hop.,"
Paris. 1876, xlix., p. 588.