. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Kinds of Vertebrates 59 alive in ordinary mammalian fashion. Ornithorhynchus incubates its leath- ery-shelled eggs in a shallow nest of grasses, while Echidna forms a tempo- rary pouch from a fold of the skin upon its belly. In this portable nest the newly-laid egg is placed and incubated until hatched and the helpless off- spring kept through the precarious days of its early growth and development. The young Echidna is fed upon a nutritious substitute for
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Kinds of Vertebrates 59 alive in ordinary mammalian fashion. Ornithorhynchus incubates its leath- ery-shelled eggs in a shallow nest of grasses, while Echidna forms a tempo- rary pouch from a fold of the skin upon its belly. In this portable nest the newly-laid egg is placed and incubated until hatched and the helpless off- spring kept through the precarious days of its early growth and development. The young Echidna is fed upon a nutritious substitute for true milk, secreted by the mother from modified sweat glands, which it licks up with its long tongue from tufts of hair on the belly of the mother. No nipples are present and if they were the baby monotreme would not be able to suck, since its lips are prolonged into a horny toothless beak, not at all fitted for the muscu- lar operation of sucking, but useful later for poking into ant-hills after 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 Walter, Herbert Eugene, b. 1867; Sayles, Leonard Perkins, 1902-. New York : Macmillan Co.
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Keywords: ., bookcentury1900, booksubjectanatomycomparative, booksubjectverte
