. Key to North American birds [microform] : 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. Birds; Ornithology; Oiseaux; Ornithologie. 202 GENERAL partly over onch other on ftltprnate sides is something like that upon which a cooper fastens the ends of any one barrel-hoop without any nailing or tying. The rings arc in some hinls perfectly cartilaginous: iu most they becdino osseous. The trachea is moved by liitcial muscles, which not only shorten th
. Key to North American birds [microform] : 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. Birds; Ornithology; Oiseaux; Ornithologie. 202 GENERAL partly over onch other on ftltprnate sides is something like that upon which a cooper fastens the ends of any one barrel-hoop without any nailing or tying. The rings arc in some hinls perfectly cartilaginous: iu most they becdino osseous. The trachea is moved by liitcial muscles, which not only shorten the tulic liy approximating the rings, but also diiii; tiic whole structure backward, by tlieir attach- ment to the clavicle and sternum. Tlic strip, Fi<! n-. -1, 2. Mt imnd. two trnrhciil rinss, popa- """ two Strips, of nuisdo lying uinm each side rivte, UN ill iiK, !h;, //, 1, 'A riijiit liuml, tlic siiiiie put of the trachea, is the contractor traclwic (fig. togutlier, UK 111 lli;. OC, n. (After Macgillivray.) ,â, ⢠. \ .i . » ⢠â , ' t. J ' ]oi, 1, ss, ss); the most anterior, when tlicre lire two, as soon as it leaves the tube to go to the clavicle, becomes the cJcido-truclmilis, nr ckido-hi/oid, fig. 101, ', /, /; the other is similarly the sterno-trachadis. The latter may lie a direct continuation of the contracior, as in tig. 101, 1. the loose strips under (/, or ajiiiarciilly arise separately from the side of the lower end of the tube, as in fig. lOl, ', e. (Other muscles are to be descrilied with the larynx sn|)erior and inferior.) The trachea is long in liinls, pio- jiortionate to tiie extension of the necit; it is very flexiious, fidlowing with ease the bcmls of the neck in which it lies so loosely. Its cross section is oval or circular; but all that i(l:itc-3 to the configuration and of the pipe requires sjiecial description,âso variable is tlio organ in ditt'erent birds. It is subject to dilatations and contractions in any part
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbirds, bookyear1884
