96 of the work he criticises, in fact, he would have
found the following passage: "And it is a remarkable
circumstance that though, so far as our present knowledge
extends, there IS one true structural break in the series of
forms of Simian brains, this hiatus does not lie between man and
the manlike apes, but between the lower and the lowest Simians,
or in other words, between the Old and New World apes and monkeys
and the Lemurs. Every Lemur which has yet been examined, in
fact, has its cerebellum partially visible from above; and its
posterior lobe, with the contained posterior cornu and
hippocampus minor, more or less rudimentary. Every marmoset,
American monkey, Old World monkey, baboon or manlike ape, on the
contrary, has its cerebellum entirely hidden, posteriorly, by the
cerebral lobes, and possesses a large posterior cornu with a
well-developed hippocampus minor."
This statement was a strictly accurate account of what was known
when it was made; and it does not appear to me to be more than
apparently weakened by the subsequent discovery of the relatively
small development of the posterior lobes in the Siamang and in
the Howling monkey. Notwithstanding the exceptional brevity of
the posterior lobes in these two species, no one will pretend
that their brains, in the slightest degree, approach those of the
Lemurs.
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