File:On the anatomy of vertebrates (electronic resource) (1866) (14568640620).jpg

Identifier: b20416039_002 (find matches)
Title: On the anatomy of vertebrates (electronic resource)
Year: 1866 (1860s)
Authors: Owen, Richard, 1804-1892
Subjects: Anatomy, Comparative Vertebrates Fishes Reptiles Mammals Birds
Publisher: London : Longmans, Green
Contributing Library: Wellcome Library
Digitizing Sponsor: Wellcome Library

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e anapophyses beginon the eighth, the metapophyses on the ninth, dorsal: these in-crease and are continued throughout the lumbar region, wherethey are very long. The anapophysis assumes the form of aridge in the last dorsal and lumbar vertebras. The lumbar 366 ANATOMY OF VERTEBRATES. di-pleur-apophyses, ib. d, are long and incline forward and down-ward. Long hypapophyses, ib. h, are also developed. The thoracic ribs consist of bony pleur- and gristly haem-apophyses : of these the seven anterior pairs, as a rule, directlyjoin the sternum, which then consists of six bones or 6 sternebers.In the Beaver, Porcupine, Coypu, and a few others, there areeight pairs of i true ribs: in an Acuchy with this number Ifound nine sternal bones, the foremost representing an 4 epi-sternal articulated to the manubrium.The first rib is the shortest, unusually so inHydromys, and has often a partial articu-lation with the last cervical vertebra. Theneural spine of the second dorsal is com-monly the longest.
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In the Beaver, fig. 230, thesacrum consists of four anchy-losed vertebrae : the articular sur-face for the ilium is almost con-fined to the transverse process ofthe first of these vertebrae : thoseof the last are the longest. Thesacral nerves directly perforatethe neurapophyses of the last two vertebrae, anterior to the vacuityleft between the bases of the transverse processes. The neuralarches of the first six caudal vertebrae are similarly perforated. Theirtransverse processes are long, horizontally flattened, and terminallyexpanded ; and the vertebrae, after these processes subside, areremarkable for their large size, and a certain degree of corre-spondence of shape with the broad, flat, scaly tegumentary tail Jerboa (Dipus Sagitta). SKELETON OF EODENTIA. 367 which they support. In most Rodents with long tails, haema-pophyses are developed beneath the intervertebral spaces, as inthe Jerboas, fig. 232, h. In one member of the Porcupine family( Cercolabes), and in one species of Capr

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