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: ter on teeth. § 22. Vertebral column of Lacertia. — The anguine or snake-like reptiles, with fixed upper-jaws and ascapular arch, pass gradually, by other formswith rudiments of limbs (Pseudopus), to theslender-bodied long-tailed lacertians. The dis-tinction is effected through the establishmentof a costal arch in the trunk, completed by theaddition of a haemal spine (sternum) and haema-pophyses (sternal ribs) to the pleurapophysesor vertebral ribs, which are alone ossified inOphidia. The vertebrae of the trunk have the same procoelian character,i. e., with the cup anterior and the ball behind, fig. 48 ; the latter,c, being usually less prominent, more oblique, and more trans-versely oval than in serpents. The vertebrae also are commonlylarger, and always fewer in number than in the typical Ophidia. Those of the Iguanas retain the superadded articular surfacesof the zygosphene, fig. 48, zs9 and zygantrum; but I have notmet with these superadded processes in other lacertians. In the

Text Appearing After Image: Trunk vertebra, Iguana 49

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