File:The structure and classification of birds (1898) (14750245342).jpg

English: Fig. 226. – Tensores patagii of Polyboroides (after Beddard). t.p.l., tensor patagii longus; t.p.br, tensor brevis; Anc, anconaeus; D, deltoid.

Identifier: cu31924022531309 (find matches)
Title: The structure and classification of birds
Year: 1898 (1890s)
Authors: Beddard, Frank E. (Frank Evers), 1858-1925
Subjects: Birds Birds
Publisher: London, New York (etc.) Longmans, Green, and co.
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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Text Appearing Before Image:
es of Ichthyornis to Hesperornis have been dwelt upon by some; but it appears that Ltdekkbes remark, that the Odontornithes are a series of birds ancestral to the modern series of toothless carinates, expresses the truth. He has furthermore added that this series differs from the Euornithes (Stejnegers name for carinates) by the absence of union between the rami of the mandible and between the distal ends of the ischium and ilium, likenesses which do not mean a near relationship, but express the degree of development of bird structure at that period. 472 STRUCTURE AND CLASSmCATION OF BIRDS ACCIPITRES Definition.—Aquinoubital. Oil gland present. Two carotids. Skull desmognathous and holorhinal. Cseca rudimentary or absent. Ambiens present. Biceps slip absent. This large group of birds admits of but a scanty definition, if we are to include in it, as is here done, the secretarybird and the American vultures; for it then shows a considerable amount of structural variation. The oil gland, Ana
Text Appearing After Image:
Fig. 226. – Tensores patagii of Polyboroides (after Beddard). t.p.l., tensor patagii longus; t.p.br, tensor brevis; Anc, anconaeus; D, deltoid. invariably present, is generally feathered, but nude in the Cathartidse. In Serpentarius this gland varies in size; in one specimen it was found to be very small and to have a very minute tuft. The after shaft is absent in the Cathartidse and in Pandion, present in other Accipitres. Twelve rectrices is the usual ACCIPITRES 473 number, but fourteen occur in Neophron percnopterus and Bhinogryphus californianus. There are potoder-down patches in Elanus, Circus, and Gypaetus. The pterylosts is described for a variety of types by NiTZSCH. The ventral tract broadens out on the breast, where it is even sometimes (Gyps fulvus) divided into an outer and inner branch. The dorsal tract forks upon the shoulders; in Gypaetus barbatus each limb of the fork is connected by a single row of. feathers with the long single median posterior portion of the tract. In Pernis apivorus

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