. 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 . Fig. 96. —a, an inch of tra-chea, contracted to tlie utmost,the rings looking like alter-nating lialfriiigs; h, the same,stret(lio<l to two inches, the ringseviilenfly complete,
. 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 . Fig. 96. —a, an inch of tra-chea, contracted to tlie utmost,the rings looking like alter-nating lialfriiigs; h, the same,stret(lio<l to two inches, the ringseviilenfly complete, with inter-vening membrane. (After Mac-gillivray.) 208 GENERAL Fig 97. — 1, 2, left hand, two tracheal rings, sepa-rate, as in fig. 96, b; 1, 2, right hand, the same puttogether, as in fig. 96, a. (After Macgillivray.) partly over each other on alternate sides is something like that upon which a cooper fastensthe ends of any one barrel-hoop without any nailing or tying. The rings are in some birds perfectly cartilaginous: in most they becomeosseous. The trachea is moved by lateralmuscles, which not only shorten the tube byapproximating the rings, but also drag thewhole structure backward, by their attach-ment to the clavicle and sternum. The strip,or two strips, of muscle lying upon each sideof the trachea, is the contractor trachece (, 1, ss, ss); the most anterior, when thereare two, as soon as it leaves the tube to go to the clavicle, becomes the cleido-trachmlis, orcleido-hyoid, fig. 101, i, /, /; the other is similarly the sterno-trachealis. The latter may be adirect continuation of the contractor, as in fig. 101, i, the loose strip
Size: 2987px × 837px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectbirdsnorthamerica
