. 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. 146 GENERAL ORNITHOLOGY. scapular arch, corresponding to the ratite and carinate sternum. (1) In Ratitee the axes of the- coracoid and scapula are nearly coincident (f
. 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. 146 GENERAL ORNITHOLOGY. scapular arch, corresponding to the ratite and carinate sternum. (1) In Ratitee the axes of the- coracoid and scapula are nearly coincident (for the most part in a continuous right line) and anchylosed together j the clavicles are usually wanting, or defective; and the coracoids are in- stepped on the sternum far (3) In all Carinata, the axes of the coracoid and scapula form an acute or scarcely obtuse angle (fig. 56, sglc); normally these bones are not anchylosed; perfect clavicles are present, anchylosed with each other, but iree from the other bones ; and the coracoids are instepped close together. Decided exceptions to these conditions, as in Notornis, are anomalous ; though incompletion of the clavicles repeatedly occurs, as noted below. The Coracoid (Gr. /copal, Icorax, a crow; etiSor, eidos, form: the corresponding bone of the human subject, which is the stunted " coracoid process of the scapula," being likened to a crow's beak; no applicability in the present case; figs. 56, c, 59, c) is a stout, straight, cylindric bone,, expanded at each end, extending forward, outward, and upward from the fore border of the sternum to the shoulder. Its foot is flattened and splayed to fit in the articular groove of fore border of the sternum already described; it often overlaps that of its fellow on the median line; is narrower- and remote from its fellow in Batitts. The head of the bone, irregularly expanded, articulates or anchyloses with the end of the scapula, and also usually with the clavicle. It be
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1894
