. 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 . ,y ^ / / J Fig. 99. - Coiling of the windpipe in the sternum of Grus americana; reduced. (From Amer. Nat.). Fig . 100. - Coiling of the windpipe in the sternum of Grus canadensis;
. 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 . ,y ^ / / J Fig. 99. - Coiling of the windpipe in the sternum of Grus americana; reduced. (From Amer. Nat.). Fig . 100. - Coiling of the windpipe in the sternum of Grus canadensis; reduced. (From Amer. Nat.) 204 GENERAL ORNITHOLOGY. the floor of tlie mouth, at the root of the tougi^betweeu the forks of the hyoid boue, restiugupon the uro-hyal. Besides its attachments of mucous and other membrane, it is connectedwith the hyoid bone by a pair of thyro-hyoid muscles (8, ), and usually with the rest of thetrachea by prolongations of the steruo- and cleido-tracheales. It is usually a small, simple,conical mouth-piece of the pipe (4, a), without the dilatation which renders the correspondingstructure —the Adams apple, — so conspicuous in the human throat. Below, it communi-cates directly with the pipe : above, it opens into the mouth by the glottidean fissure, or rimaglottidis (3, c), a median lengthwise chink, which opens and shuts as its sides diverge or closetogether, and which is further defended in fi-ont by a folding of the mucous membrane of themouth, constituting a rudiment of that
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1896
