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The prosimii, or "half apes," including the lemurs, are nearly all arboreal forms. Perhaps they were driven to this life by their more powerful competitors. The arboreal life developed the fingers and toes, and most of these end, not with a claw, but with a nail.
For these reasons a survey of the various members of the order of primates must deal largely with the progressive elaboration of the brain and the entailed effects of this enlargement. The order of primates is subdivided as follows : Sub-order 1. PROSIMII. Lemurs. Sub-order 2. ANTHROPOIDEA. Family 1. Hapalidæ. The marmosets. Family 2. Cebidæ. The American or tailed monkeys. Family 3.
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