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Triassic. : 21. Monotrema. Promammalia. : 21. Ornithodelphia. Echidna. Ornithorhyncus. Jurassic. : 22. Marsupalia. Prodidelphia. : 22. Didelphia. Didelphys. Perameles. Cretaceous. : 23. Mallotheria. Prochoriata. : 23. Insectivora. Erinaceida. Older Eocene. : 24. Lemuravida. Older lemurs. Dentition. 3. 1. 4. 3. : 24. Pachylemures. Neo-Eocene. : 25. Lemurogona. Later lemurs.
The lemurs or half-apes are the stem-group, descending from the older Mallotheria of the Cretaceous period. From them the apes were evolved in the Tertiary period, and man was formed from these towards its close. But they are very interesting, and are the last survivors of a once extensive group.
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