The transverse arc from one auditory foramen to the other across the middle of the sagittal suture measures about 13 inches.
"The Antiquity of Man"
Charles Lyell
The sagittal crest is insignificant; the occipital crest is high, but not very massive.
"A Bilateral Division of the Parietal Bone in a Chimpanzee; with a Special Reference to the Oblique Sutures in the Parietal Bulletin of the AMNH, Vol. XIII, Article XXI, pp. 281-295, Dec. 31, 1900"
Ales Hrdlicka
The point at which the division has reached the sagittal suture is situated a little behind the middle of the latter.
"A Bilateral Division of the Parietal Bone in a Chimpanzee; with a Special Reference to the Oblique Sutures in the Parietal Bulletin of the AMNH, Vol. XIII, Article XXI, pp. 281-295, Dec. 31, 1900"
Ales Hrdlicka