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From the lemurs, on the other hand, the form of the brain, the character of the teeth, the structure of the skull, and the deciduate discoidal placenta at once separate the group.

Placenta deciduate and dome-like, composed of an aggregation of numerous discoidal lobes.

The uterus is two-horned, and the teats are abdominal and variable in number; while the placenta is deciduate, and almost always zonary.

The penis is pendent; the testes are abdominal or inguinal; the teats, usually two in number, thoracic; the uterus is simple or with more or less long cornua; the placenta discoidal and deciduate; and the smooth cerebral hemispheres do not extend backwards over the cerebellum.