. Outlines of zoology. Zoology. Fig. 2.—Phenacodus, a primitive extinct Mammal.—After Cope. (<r) Prolotheria, Ornithodelphia, or Monotremes — the egg-laying duckmole (Ornithorhynchus), Echidna, and Proechidna. Birds.—There can be no hesitation as to the class which ranks next to Mammals. For Birds are in most respects as highly developed as Mammals, though in a different direc- tion. They are character- ised by their feathers and wings, and many other adaptations for flight, by their high temperature, by the frequent spongi- ness and hollowness of their bones, by the tend- ency to fusion in
. Outlines of zoology. Zoology. Fig. 2.—Phenacodus, a primitive extinct Mammal.—After Cope. (<r) Prolotheria, Ornithodelphia, or Monotremes — the egg-laying duckmole (Ornithorhynchus), Echidna, and Proechidna. Birds.—There can be no hesitation as to the class which ranks next to Mammals. For Birds are in most respects as highly developed as Mammals, though in a different direc- tion. They are character- ised by their feathers and wings, and many other adaptations for flight, by their high temperature, by the frequent spongi- ness and hollowness of their bones, by the tend- ency to fusion in many parts of the skeleton, by the absence of teeth in modern forms, by the fixedness of the lungs and their associa-. FlG. 3.—Extinct moa and modern kiwi. —After Carus Sterne. tion with numerous air sacs, and so 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 Thomson, J. Arthur (John Arthur), 1861-1933. Edinburgh, Glasgow and London, H. Frowde and Hodder & Stoughton
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Keywords: ., bookauthorth, bookcentury1800, bookdecade1890, booksubjectzoology
