. La clé pour les oiseaux nord-américains. Contenant un compte rendu concis de toutes les espèces d'oiseaux vivants et fossiles à l'heure actuelle connues du continent au nord de la frontière mexicaine et des États-Unis, y compris le Groenland et le bas de la Californie, avec lesquelles sont incorporés ornithologie générale: Un aperçu de la structure et de la classification des oiseaux; Et Field ornithologie, un manuel de collecte, de préparation et de conservation des oiseaux . res, coiTesponding aux glandes parotides, sous-maxillaires, et sublinguales des mammifères, varient extrêmement dans leur développement. Dans les pics, par exemple, et quelques Raptores, l'élaboration

• Contributeur: Reading Room 2020 / Alamy Banque D'Images
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. 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 . res, coiTesponding to the parotid, submaxillary, andsublingual glands of mammals, vary extremely in their develop-ment. In woodpeckers, for example, and some Raptores, elaboratespecial salivary glands occur, having a glomerate structure, anda special stenonine duct. In many other birds, similarly com-pound but less elaborate submaxillary glands pour their secretioninto the mouth by a series of pores. In most birds, however, thesalivary glands are small, simple, and less distinct from variousother sets of mucous crypts which open into the mouth. In thegreat bustard {Otis tarda; fig. 102) there is a singular buccal struc-ture ; a great pouch opening beneath the tongue, susceptible of distension during those amatoryantics termed the shovnng-off of the creature. It is in fact an air-sac, but not of the kindabready considered (p. 200), having no connection with the respiratory system. The narial, eustachian and glottidean apertures are commonly defended by retrorse papillae ; and other such. Fig. 102. — Gular pouch ofbustard; copied by Shufeldtfrom Garrod. a, tongue; b, the pouch, opening under a, hanging in front of c, the tra-chea, behind which is therf, with its crop, e. THE ANATOMY OF BIRDS. — SPLANCHNOLOGY. 211 processes of mucous membrane, knobbed or acute, may occur elsewhere in lines and patches.The roof of the mouth is nearly all hard palate, as already said; its soft iioor is the mucousmembrane and skin between the jaws, with muscular or other intervening structures. Theprincipal flooring muscle is the mylo-hyoid; the genio-hijoid (fig. 101, , d) i

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