highly mobile, and capable of great elongation when the animal is
enraged, then hanging over the chin; skin of the face and ears naked,
and of a dark brown, approaching to black.

"The most remarkable feature of the head is a high ridge, or crest of
hair, in the course of the sagittal suture, which meets posteriorily
with a transverse ridge of the same, but less prominent, running round
from the back of one ear to the other. The animal has the power of
moving the scalp freely forward and back, and when enraged is said to
contract it strongly over the brow, thus bringing down the hairy ridge
and pointing the hair forward, so as to present an indescribably
ferocious aspect.

"Neck short, thick, and hairy; chest and shoulders very broad, said to
be fully double the size of the Enche-ekos; arms very long, reaching
some way below the knee--the fore-arm much the shortest; hands very
large, the thumbs much larger than the fingers....

FIG. 11.--Gorilla walking (after Wolff).

"The gait is shuffling; the motion of the body, which is never upright
as in man, but bent forward, is somewhat rolling, or from side to
side. The arms being longer than the Chimpanzee, it does not stoop as
much in walking; like that animal, it makes progression by thrusting
its arms forward, resting the hands on the ground, and then giving the
body a half jumping half swinging motion between them. In this act it
is said not to flex the fingers, as does the Chimpanzee, resting on its
knuckles, but to extend them, making a fulcrum of the hand. When it
assumes the walking posture, to which it is said to be much inclined, it
balances its huge body by flexing its arms upward.