. 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 . ing gently up tothe general level behind, with a concave (rarely protuberant) fi<j. passerinevertical border, and pronounced apex, to which the clavicles may sternam
. 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 . ing gently up tothe general level behind, with a concave (rarely protuberant) fi<j. passerinevertical border, and pronounced apex, to which the clavicles may sternam, pectoral arches, and or may not be anchylosed, as they are in a pelican for instance. In sternal ends of ribs; from the .J^ ^ ^ robin, Tturclms nagratonua, nat. Opisfhocomus, the clavicles anchylose with the manubrium of size; Dr. shufeldt, the sternum. The external surface, both of body and keel, is Sternum single-notched, with . .,..,. promment costal processes and ridged m places, mdicatmg Imes of attachment of the different pee- forked manubrium; five ribs toral muscles. In a few birds, notably swans and cranes, the keel reaching rib floats expanded and hoUowed out to receive folds of the windpipe in its interior (see figs. 99, 100).—But the numberless modifications of the sternum in details of configuration belong to systematic ornithology, not to rudimentary 3. TUB PECTORAL ARCS. The Pectoral Arcb (hsbt. pectus, the breast; figs. 1, 2, 56, 58, 59) is that bony structureby which the wings are boine upon the axial skeleton. It is to the fore limb what the pelvicarch is to the hind limb; but is disconnected from the back-bone and united with the breast-bone, whereas the reverse arrangement obtains in the pelvic, which is fused with the sacralregion of the spine. Each pectoral arch of birds consists (chiefiy) of three bones : the scapulaand coracoid, forming the shoulder-girdle proper, or scapular a/rch ; and the accessory clavicles
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1896
