. 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 . theuro-genital, and lower portion of the digestive, vis-cera. It consists of the sacral vertebrae on themiddle dorsal line, flanked on each side by the bonesof the pelvic arch, whi
. 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 . theuro-genital, and lower portion of the digestive, vis-cera. It consists of the sacral vertebrae on themiddle dorsal line, flanked on each side by the bonesof the pelvic arch, which supports the hind vertebrates generally the pelvic basin is com-pleted on the ventral aspect by union (symphysis;Gr. (Tvv, sun, together; (^ivais, grox^nh) of the bonesfrom opposite sides. Excepting only Struthio, whichhas a pubic symphysis; and Bhea, which has anischiac symphysis just below the sacral vertebrae,the pelvis of a bird is entirely open below andbehind; each pelvic arch anchylosing firmly withthe sacral vertebrae to form a roof over the visceraabove named. This sacro-iliac anchylosis is com-monly coextensive with the confluence of the manyvertebrae which make the sacrum of ordinarylanguage, that is, ft-om the first dorso-lumbar to thelast uro-sacral. The whole roof-like affair lookssomething like a keelless sternum inverted. Thepelvic arch of each side consists of three bones, ilium,. Fig. 60. — Pelvis of a heron (Ardea herodias),nat. size, viewed from below; from nature by W. Shufeldt, dl, dorso-lumbar vertebrato and including the last one, sc ; below sc, for theextent of the lart/i black spaces (opposite the arrow)are the true sacral vertebrte; its, urosacral verte-brse (opposite the five oval black spaces; II, ilium;Is, ischium; P, pubis; oh, obturator arrow flies into the acetabulum. 148 GENERAL ORNITHOLOGY. ischium, and pubis, which have iudependent ossific centres, but become firmly consolidatedtogether to form the haunch
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectbirdsnorthamerica
