. Animal biology. Zoology; Biology. 396 METAZOAN PHYLA mum of quickness and accuracy in accommodation. Birds possess a nictitating membrane, which is drawn across the eyeball from the inner angle of the eye outward. 425. Classification.—The classification of birds is a question about which there has been much difference of opinion. All classifications agree, however, in distinguishing between the ancient, reptile-like, fossil birds forming the subclass Archaeornithes (ar ke or'ni thez; G.,. Fig. 271.—Fossil remains of Archaeopteryx siemensi Dames, representing a specimen in the Berlin Museum.
. Animal biology. Zoology; Biology. 396 METAZOAN PHYLA mum of quickness and accuracy in accommodation. Birds possess a nictitating membrane, which is drawn across the eyeball from the inner angle of the eye outward. 425. Classification.—The classification of birds is a question about which there has been much difference of opinion. All classifications agree, however, in distinguishing between the ancient, reptile-like, fossil birds forming the subclass Archaeornithes (ar ke or'ni thez; G.,. Fig. 271.—Fossil remains of Archaeopteryx siemensi Dames, representing a specimen in the Berlin Museum. {From Steinmann-Doderlein, " Elemente der ;) X /^. archaios, ancient, and orni'thes, birds) and represented by a single genus, Archaeopteryx, and a second subclass, the Neornithes (ne or' ni thez; G., neos, new, and ornithes, birds), or modern birds, containing only a few extinct forms. Archaeopteryx (Fig. 271) was a bird about the size of the common crow, had teeth, three free fingers on the wing, flight feathers on the legs, and a long, lizard-like tail (Fig. 272). The caudal vertebrae were separate and the tail had flight feathers on both sides for its full length. The largest living bird is the African ostrich, which is 8 feet in height, but the aepyornis, a bird which lived in Madagascar until about five centuries ago, attained a height of 10 feet. On the other hand, a. 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 Wolcott, Robert Henry, 1868-1934. New York ; London : McGraw-Hill Book Company, Inc.
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