. Key to North American birds. Containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary, inclusive of Greenland and Lower California, with which are incorporated General ornithology: an outline of the structure and classification of birds; and Field ornithology, a manual of collecting, preparing, and preserving birds . Fig. 96. — a, an inch of tra-chea, contracted to the utmost,the rings looking like alter-nating half-rings; h, the same,stretched to two inches, the ringsevidently complete, with i
. Key to North American birds. Containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary, inclusive of Greenland and Lower California, with which are incorporated General ornithology: an outline of the structure and classification of birds; and Field ornithology, a manual of collecting, preparing, and preserving birds . Fig. 96. — a, an inch of tra-chea, contracted to the utmost,the rings looking like alter-nating half-rings; h, the same,stretched to two inches, the ringsevidently complete, with inter-vening membrane (After Mac-gillivray.) 202 GENERAL ORNITHOLOGY. partly over each other on alternate sides is SiWethiug like that upon which a cooper fastensthe ends of any one barrel-hoop without any nailing or tying. The rings are in some birds perfectly cartilaginous: in most they becomeosseous. The trachea is moved by lateralmuscles, which not only shorten the byapproximating the rings, but also drag thewhole structure backward, by their attach-ment to the clavicle and sternum. The strip,or two strips, of muscle lying upon each side of the trachea, is the contractor tracheee ( Fig. 97. — 1, 2, left hand, two tracheal rings, sepa-rate, as in fig. 96, b; 1, 2, right hand, the same puttogether, as in fig. 96, «. (After Macgillivray.) . 101, 1, ss, ss); the most anterior, when thereare two, as soon as it leaves the tube to go to the clavicle, becomes the cleido-trctchealis, orcleido-hyoid, fig. 101, i, /, /; the other is similarly the sterno-trachealis. The latter may be adirect continuation of the contractor, as in fig. 101, i, the loose strips under q, or apparentlyarise separately from the side of the lower end of the tube, as in fig. 101,16, e. (Other musclesare to be described with the larynx superior and inferior.) The trachea is long in birds, pro-portionate to the extension of the neck; it is very flexuous, following with ease the bends ofthe neck i
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1896
