. 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. Birds; Birds. Fig. 64. — Skull of ohlok, flftli day of Incubation, X9 diameterB. Seen ftom above, tlio membranous roof of the skull and the brain removed, , anterior cere- bral
. 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. Birds; Birds. Fig. 64. — Skull of ohlok, flftli day of Incubation, X9 diameterB. Seen ftom above, tlio membranous roof of the skull and the brain removed, , anterior cere- bral vesicle; e, eye; c, notochord, running through the middle of the basilar plate or parachordal cartilage, In which are already visible the rudimentary oar-parts, c(, the cochlea, hsc, the horij^ontal semicircular canal; pts, the pituitary space, bounded by tr, the trabooulco, which oomo together before It to form the fronto-nasal plate, fn, in flg. 65; Ig, lingula or bridge connecting 1 rabeoulffl with parachordal cartilage ; 5, notch after- ward becoming foramen ovale for passage of parts of the fifth (trifacial) nerve ; 9, foramen for hypoglossal nerve; q, separate cartilage forming the future quad- rate bone. (After Parker, in Bncy. Brit.) .P*. Fin. 65.— Same as flg. 64, hut soon from below. fii'l, anterior cerebral vesicle; e, eye; m, mouth i p*s, pituitary space; J'n, ft'onto-nasal plate; tr, tmils of the trabeculte, fi'oo again aftor their union and bent strong- ly from the original axis of the traboouloj; n, iixtoi nal nostril; iru:ii, aubocular bar of cartilage, or ptory- go-palallno rod, to form pn, palatine, and pg, pterygoid bone, and othor parts of the upper Jaw, u« the maxll- lary,JiiKiil and iiiiadrato-Jugal; r;, quadrate cartilage, same as man In Ug. (11; ml;, nuwkolian cartilage, to form, lower Jaw; those pmlH aro in the first post-oral visooral archj ch, ccrato-hyal, and hh, baslhyal, of seoond post- oral aroh; rjyr, cerato-branohial, rhr, opl-brancbtaU bin
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1894
