. 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 la Basse-Californie, avec lesquelles sont incorporées l'ornithologie générale: Un aperçu de la structure et la classification des oiseaux; et l'ornithologie de champ, un manuel de collecte, de préparation, et de conservation des oiseaux . hichwill faire le labyrinthe nasal et la partition entre la cavité du nez et celle de l'oeil, quand il existe. Les développements Suchlatéral de la plateethmoïde sont l'aliet

• Contributeur: Reading Room 2020 / Alamy Banque D'Images
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• Dimensions: 1727 x 1446 px | 29,2 x 24,5 cm | 11,5 x 9,6 inches | 150dpi

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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 . hichwill make up the nasal labyrinth and thepartition between the cavity of the noseand that of the eye, when any exists. Suchlateral developments of the ethmoid plateare the aliethmoid, aliseptal, and alinasal.This plate extends backward in mid-linet(i the optic foramen, 3, ending in the ante-rior cUnoid wall, asc, separated from the(parachordal) posterior clinoid wall by theoriginal pituitary space, now the openingthrough which the carotid arteries, ie, enterthe brain cavity. Besides ethmoidal partsproper, the plate develops at what will bethe end of the upper beak a prenasal carti-lage, pn, to become the axis of the beak.The mouth is become already better formed, the axis of its cavity pointing more forwardthan downward; and great changes areundergoing in parts of the ear at the backcorner of the mouth. The quadrate andmeckelian cartilages are assuming much oftheir true form. The quadrate developsan orbital process, which extends free intothe orbit, and an otic process which articu-. ael Pis. 66. — Head of a chick, second stage, after five daysof incubation, section in profile; X 6 diameters. cvl, cv2fCv3, first, second, and third cerebral vesicles; 1, place of thefirst nerve, the olfactory; 2, pla«e of second nerve, theoptic; ic, internal carotid artery, running into skull at whatwas originally the pituitary space, now an opening boundedin front by the anterior, acl, behind by the posterior, pel, clinoid walls; tic, notochord; oc, occipital condyle, thenceto pet being the original parachordal cartilage, here seen inprofile; eo, exoccipital; eth, ethmo

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