. Zoology for high schools and colleges. Zoology. 522 ZOOLOQT. While the sternum of the cassowaries and other struthious birds (RatitcB) is smooth, approaching that of reptiles, that of the higher living birds is keeled or carinate (Fig. 454, crs); hence these birds are called Cari- natm; to this keel and neighboring parts the muscles which raise and lower the wings are attached. The fore limbs of birds (Pig. 455) are greatly modified to form the framework of the wings. In spreading and closing the wings, the bones of the forearm slide along each other in a peculiar manner. (Ooues.) The ulna i
. Zoology for high schools and colleges. Zoology. 522 ZOOLOQT. While the sternum of the cassowaries and other struthious birds (RatitcB) is smooth, approaching that of reptiles, that of the higher living birds is keeled or carinate (Fig. 454, crs); hence these birds are called Cari- natm; to this keel and neighboring parts the muscles which raise and lower the wings are attached. The fore limbs of birds (Pig. 455) are greatly modified to form the framework of the wings. In spreading and closing the wings, the bones of the forearm slide along each other in a peculiar manner. (Ooues.) The ulna is usually thicker and longer than the radius, and there are only two carpal bones, one radial, the other ulnar, in adult recent birds. The hand in the Apteryx and cassowaries has but one complete digit, while in other birds there are three digits, which probably correspond to the first, second, and third fingers of the human hand. The wings are attached to a strong shoulder-girdle, which consists of the two collar bones, uniting to form the wish-bone, and of a coracoid bone and Pig. 454.—Stemiim of the Giiiiiea Hen. eeen from in front: ere, crest; c, coracoid bone.—After Gegen- 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 Packard, A. S. (Alpheus Spring), 1839-1905. New York, H. Holt and Company
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectzoology
