In the other man-like Apes again, the Gibbons, these proportions are
still further altered; the length of the arms being to that of the
spinal column as 19 to 11; while the legs are also a third longer than
the spinal column, so as to be longer than in Man, instead of shorter.
The hand is half as long as the spinal column, and the foot, shorter
than the hand, is about 5/11ths of the length of the spinal column.
Thus 'Hylobates' is as much longer in the arms than the Gorilla, as the
Gorilla is longer in the arms than Man; while, on the other hand, it is
as much longer in the legs than the Man, as the Man is longer in the
legs than the Gorilla, so that it contains within itself the extremest
deviations from the average length of both pairs of limbs (See the
illustration on page 196).
The Mandrill presents a middle condition, the arms and legs being nearly
equal in length, and both being shorter than the spinal column; while
hand and foot have nearly the same proportions to one another and to
the spine, as in Man.
In the Spider monkey ('Ateles') the leg is longer than the spine, and
the arm than the leg; and, finally, in that remarkable Lemurine form,
the Indri ('Lichanotus'), the leg is about as long as the spinal
column, while the arm is not more than 11/18 of its length; the hand
having rather less and the foot rather more, than one-third the length
of the spinal column.
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