. 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. 198 GENERAL OBNITHOLOGY. and are termed aves Icevo-carottd/inm (fig. 91). 3. In certain parrots only, with two carotids, the right is as in (1), but the left rims supe
. 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. 198 GENERAL OBNITHOLOGY. and are termed aves Icevo-carottd/inm (fig. 91). 3. In certain parrots only, with two carotids, the right is as in (1), but the left rims superficially along the neck with the jugular vein and pneumogastrie nerve; such birds are aves bicarotidmte ahnormales (fig. 92). 4. Two carotids, arising normally, unite almost immediately, and the single trunk runs to near the head, just as if there were two as in (1); then it bifurcates, as in birds with left carotid only (2). Such birds are termed aves conjuneto-earotidince. Special cases of (4) are : in the bittern, the two roots are of nearly equal size (fig. 93); in the flamingo, the left is very small (fig. 94); in a cockatoo, the right is very small (fig. 95). Parrots display all fonr of the arrangements; the cases of the bittern and flamingo are unique. The question is thus for nearly all birds narrowed to whether there be two normal carotids (1), or the left only (2). Observations upon three hundred genera show two in one hundred and ninety-three, in one hundred and seven the left only; but the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Coues, Elliott, 1842-1899. Boston, Estes and Lauriat
Size: 1472px × 1697px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1894
