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Inside Officer Loor’s head, Dr. Bederson saw that the knife had sliced through the vein in the Sylvian fissure, which contains crucial blood vessels.

Besides this there is a concealed and isolated lobe, described on account of its situation as an island, which is covered from view by the overlapping of the two sides of the Sylvian fissure.

In addition to the two fissures already named, there is, in the Echidna, one which in position and mode of formation corresponds with the Sylvian fissure of higher mammals.

The cerebral hemispheres are more or less elongated; always with three or four convolutions on the outer surface forming arches above each other, the lowest surrounding the Sylvian fissure.

The angular gyrus is at B. A is over the anterior branch of the middle meningeal artery, and the bifurcation of the lateral or Sylvian fissure; AC follows the horizontal limb of the lateral fissure.