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The tribes of the cheirotheria I arrange as follows: Typical Bimana. Sub-typical Simiadae. Natatorial Vespertilionidae. Suctorial Lemuridae. Rasorial Cebidae. Here man is put into the typical place, as the genuine head, not only of this order, but of the whole animal world. The double affinity which is requisite is obtained, for here he has the simiadae on one hand, and the cebidae on the other.
The most intensely arboreal animals in the world are the South American monkeys of the family Cebidae, many of which have a fifth hand for climbing in their prehensile tails, adapted for this function by their strong muscular development, and the naked palms under their tips.
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