File:Contributions to the anatomy of birds (1882) (14752069731).jpg

Identifier: contributionstoa00shuf (find matches)
Title: Contributions to the anatomy of birds
Year: 1882 (1880s)
Authors: Shufeldt, Robert Wilson, 1850- (from old catalog) United States. Geological and geographical survey of the territories. (from old catalog)
Subjects: Birds
Publisher: Washington
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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of an extensive antitrochanter, whosesurface is directed forwards, downwards, and outwards. The greatestamount of surface for the articulation of the femoral head, between theinternal and external ring, is found anteriorly and below. A stout os-seous pillar separates the cotyloid ring from the much larger and sub-elliptical ischiadic vacuity, which is posterior to it. Below and betweenthe two we find the long, oval obdurator foramen, its major axis nearlyparallel with the pubic bone, and a deficiency occurring at its posteriorarc, where this latter element fails to meet the ischium. The separatingand outlying bone about these lateral openings in the pelvis of theCathartidce is thick and strong, more particularly about the acetabularring, affording ample support for the powerful pelvic limb of these birds.The pubic style, after passing the obdurator foramen, is a moderatelywide strip of bone, compressed from side to side, nearly or quite touch- 780 GEOLOGICAL SURVEY OF THE TERRITORIES.
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SHUFELTTT.) OSTEOLOGY OF THE CATIIARTIDiE. 781 ing for its entire length the lower ischial border, except in Gyparchus,where quite an interspace seems to exist. Its outer or posterior ex-tremity is produced well beyond the other pelvic bones, to curve inwardstowards its fellow of the opposite side, from which it is separated by avarying space two and a half centimeters in our specimen of Sarcor-hamphus, nearly one and a half in C. aura and Catharista. That portionof the outer aud lateral surface of the ilium that is posterior to theischiadic foramen, and below the continuation of the gleuteal ridge,looks downwards and outwards; opposed to it, below, is the ischial sur-face looking upwards and outwards; these bones thus form a longi-tudinal aud shallow furrow between them, the anterior extremity beingin the posterior arc of the ischiadic foramen, the posterior extremityterminating in the apex of a notch that is found between the ilium andischium in the posterior pelvic margin. This not

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