. 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. 198 GENEHAL OliNITHOLOGY. li and arc termed aves Irwo-carotidince (fig. 91). 3. In certain parrots only, with two carotids, the right is as iu (1), but tlie left riuis siiiierficially along the neck with the jugular vein anil pneumogastric nerve; such birds are aves bicarotidince abnonnales (fig. 92). 4. Two carotids, arising norm
. 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. 198 GENEHAL OliNITHOLOGY. li and arc termed aves Irwo-carotidince (fig. 91). 3. In certain parrots only, with two carotids, the right is as iu (1), but tlie left riuis siiiierficially along the neck with the jugular vein anil pneumogastric nerve; such birds are aves bicarotidince abnonnales (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 iu birds with left carotid only (2). Sucli birds arc termed aves conjiindo-carotidina:. Special cases of (4) are : in the bittern, the two roots are of nearly equal size (fig. 93); in the fianiiugo, the left is very small (fig. 94); in a wjckatoo, the right is very small (fig. 95). Parrots display all four oH the arrangements; the cases of tlie 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 iu one hundred and uinety-tliree, iu one hundred and seven the left only; but tlie. 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
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbirds, bookyear1884
