. Animal biology. Biology; Zoology; Physiology. SURVEY OF VERTEBRATES 127 1. Monotremes The primitive egg-laying Mammals living to-day, known as Monotremes, quite evidently point to a Reptilian ancestry for the class. Although they are oviparous, the young when hatched. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Woodruff, Lorande Loss, 1879-1947. New York The Macmillan company

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