. 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; 1887. 198 GENERAL ORNITHOLOGY. and arc termed aves Imvo-carotidincc (fig. 91). 3. In certain parrots only, with two carotids, the right is as in (1), but the left runs
. 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; 1887. 198 GENERAL ORNITHOLOGY. and arc termed aves Imvo-carotidincc (fig. 91). 3. In certain parrots only, with two carotids, the right is as in (1), but the left runs superficially along the neck with the jugular vein and pncniuogastric nerve; such birds are aves hicarotidincc ahnormahs (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 (3). Such birds are termed aves conjuncto-carotidina:. 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 four of the arrangements ; the cases of the bittern and flamingo are unique. The question is thus ftjr nearly all birds narrowed to wlietber there be two normal carotids (1), or the left only (2). Observations upon three hundred genera show two m 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; Fuertes, Louis Agassiz, 1874-1927. asn; Estes & Lauriat. prt; John Wilson and Son. prt. Boston, Estes and Lauriat
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbirds, bookyear1887
