File:Image from page 103 of "On the anatomy of vertebrates (electronic resource)" (1866) (14752323531).jpg

Identifier: b20416039_001 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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Text Appearing Before Image: Fore part of skeleton of a Lizard Geckos the vertebrae are, exceptionally, biconcave.1 The ribs donot begin to be developed so near the head as in Ophidia. Notonly the atlas and dentata, but the third vertebra, fig. 49, andsometimes, as in the Monitor ( Varanus), the four following verte-brae, are devoid of pleurapophyses: when these first appear they See those of the subgenus Rhynchocephalus, xliv. vol. i. No. 662, p. 142. 58 ANATOMY OF VERTEBRATES. are short, as at

Text Appearing After Image: but elongate in succeeding vertebrae, b to e; and usually at the eighth,or ninth, fig. 49, /, 6,{Lacerta), from the heador tenth (Varanus), theyare joined through themedium of ossified haema-pophyses to the ster-num. Two( Varanus),three( Chameleo, Iguana), or four(Cyclodus), following ver-tebrae are similarly com-pleted; and then the haema-pophyses are either unitedbelow without interveningsternum ( Chameleo), or twoor three of them are joinedby a common cartilage to the cartilaginous end ofthe sternum. The haema-pophyses afterwards pro-ject freely, and are reducedto short appendages to the pleurapophyses. Thesealso shorten, and sometimessuddenly, as, e. g., afterthe eighteenth vertebra inthe Monitors ( Varanus), inwhich they end at thetwenty-eighth vertebra, asthey began, viz., in theform of short straight ap-pendages to the diapo-physes. The Draco volans, fig.50, is so called on accountof the wing-like expansionsfrom the sides of its body,supported, like the hood ofthe cobra, by slend

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