. 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. 152 GENERAL ORNITHOLOGY. nasal plate, wliich is so arched over do\ATiward as to disappear from this view, as seen in fig. 65, where fn is The tVouto-uasal proces
. 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. 152 GENERAL ORNITHOLOGY. nasal plate, wliich is so arched over do\ATiward as to disappear from this view, as seen in fig. 65, where fn is The tVouto-uasal process, and u is the future external After uniting in the inter-nasal phite, the fore ends uf the trahccuhv separate and become free ; their free ends are the under extremities of this Jirst cisceral arch (first and only pre-oral arcli). The same chick's head, now viewed from heluw, fig. 05, shows the squarish aperture, m. of the future mouth; the three post-oral arches, with their respective cartilaginous hars, out of wliich are to he formed the hones of the jaws and tongue. 1, 5. 3. are the coiTespondiug visceral clefts, between the arches ; the first of these is to he modelled into the car- passages (outer and middle ear and eustachian tube) : the others will disappear. The qundrnte cartilage, q, is the same that was seen in fig. 04; it is already nearly in position, between the hind ends of the scaffolding of the npper and under jaw. The curved suhocuJar or maxiUo- palati)i€ bar, ma:p, developed in the first post-oral arch, already indicates ixiiteviorly jjaJatine, pa, and posteriorly, pterygoid, pg, parts : it will fonn the bones so named, and others of the. Fig. &4. — Skull of cliiok, tifcti ilay nf incubation. X9 diameters. Seen from above, the uienibrannus roof of the skull and the brain removeil. oil, anterior cere- bral vesicle : e, eye : r, notoohord, running through the middle of the basilar plate or parachordal cartilage, in which are already visible t
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbirds, bookyear1887
