. Outlines of zoology. Zoology. GENERAL CHARACTERS. 597 bones have a spongy texture, due to cavities filled with air from the nasal and Eustachian tubes. There is a well-developed sternum, generally with a keel, to which the pectoral muscles are in part attached. The strong coracoids reach and articulate with the sternum. Ifi flying birds, the clavicles are well developed, and are usually con- nected by a?i interclavicle, which is often fused to the top of the breast bone. The fore-limb has not more than three digits, the three metacarpals are fused (except in Archsopteryx),. -Position of Orga
. Outlines of zoology. Zoology. GENERAL CHARACTERS. 597 bones have a spongy texture, due to cavities filled with air from the nasal and Eustachian tubes. There is a well-developed sternum, generally with a keel, to which the pectoral muscles are in part attached. The strong coracoids reach and articulate with the sternum. Ifi flying birds, the clavicles are well developed, and are usually con- nected by a?i interclavicle, which is often fused to the top of the breast bone. The fore-limb has not more than three digits, the three metacarpals are fused (except in Archsopteryx),. -Position of Organs in li Bird. (After Selenka.) Nostrils ; tr., trachea; cr., crop ; h., heart; St., sternum ; pr., proveiitriculus ; ^., gizzard ; c, caica ; /., pygostyle ; /7',, pelvis ; k., kidney; /., lung. and there are only two separate carpals, the others fusing with the metacarpals, and thus forming a carpo-metacarpus. The metacarpals and digits bear the primary feathers or quills. The ilia of the pelvis are firmly fused to the complex sacrum ; the acetabulum is incompletely ossified ; the pubes (or post-pubic. 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; Newbigin, Marion I. (Marion Isabel), 1869-1934; Smith, Preserved, 1880-1941. fmo. New York, D. Appleton & Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
