. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. 3i8 CI^SSIFICA TION OF VER TEBRA Fig. 312. Side and sectional veins of skull of Cydodzis, from Huxley. Ar, articulare; BS, basisphenoid; BO, basioccipltal; Co, columella; D, dentary; EO, exoccipital; Fr, frontal; EpO, epiotic; yu, jugal; J/.v, maxillary ; Xa, nasal; Pa, parietal; Pf, postfrontal; Pinx, premaxillary; PI, palatine; Pt, pterygoid; PrO, prootic; Op O, opisthotic; Prf, prefrontal; Qu, quadrate; SO, supraoccipital; Sq, squamosal; Tr, transversum; Vo, vomer; V, VII, passages for fifth and seventh Sub-Order i.


. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. 3i8 CI^SSIFICA TION OF VER TEBRA Fig. 312. Side and sectional veins of skull of Cydodzis, from Huxley. Ar, articulare; BS, basisphenoid; BO, basioccipltal; Co, columella; D, dentary; EO, exoccipital; Fr, frontal; EpO, epiotic; yu, jugal; J/.v, maxillary ; Xa, nasal; Pa, parietal; Pf, postfrontal; Pinx, premaxillary; PI, palatine; Pt, pterygoid; PrO, prootic; Op O, opisthotic; Prf, prefrontal; Qu, quadrate; SO, supraoccipital; Sq, squamosal; Tr, transversum; Vo, vomer; V, VII, passages for fifth and seventh Sub-Order i. Lacertilia (Saurii). Scaled or plated reptiles usually with two pairs of feet; vertebrae rarely amphicoelous ; premaxilla single or paired. Postorbital arcade some- times entire, jugal arch never complete. AH- and orbitosphenoids not ossified ; shoulder girdle always present. Sternum and episternum usually present. Feet sometimes rudimentary or absent; when present, usually five-toed and ambulator)': the maxilla, palatines, and pterygoids cannot move on the bones of the skull, and the mouth can be opened to but a moderate extent. Movable eyelids, tympanic cavity and membrane usu- ally occur. The arteries supplying the aJimentarj' canal are extremely variable. The lizards in their outward appearance resemble closely the crocodiles and Sphenodoii, but in structure they have many and important points of difference. The apodal forms are strikingly snake-like: but these may be distinguished in most cases at a glance by the presence of eyelids and small scales instead of broad abdominal scutes on the ventral surface of the body. The lizards are largely insectivorous, and only one has the repu-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Compan


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