. The chordates. Chordata. Fig. 377. Parietal eye of the legless lizard. Angais fragilis. (cl) Connective- tissue cells around nerve; (gc) ganglion-cells; (I) lens; (n) nerve-fibers; (pn) parietal nerve; (pc) pigment-cells; (r) retinal cells; (vb) vitreous body. (After Nowikoff. Courtesy, Kingsley: "Comparative Anatomy of Vertebrates," Philadelphia, The Blakiston Company.). Fig. 378. Chirotes, an almost legless lizard. (Courtesy, Brehm: "Tierleben," Leipzig, Bibliographisches Institut.) elastic ligament. No sternum. .Movable eyelids, tympanic cavity and membrane are lacking
. The chordates. Chordata. Fig. 377. Parietal eye of the legless lizard. Angais fragilis. (cl) Connective- tissue cells around nerve; (gc) ganglion-cells; (I) lens; (n) nerve-fibers; (pn) parietal nerve; (pc) pigment-cells; (r) retinal cells; (vb) vitreous body. (After Nowikoff. Courtesy, Kingsley: "Comparative Anatomy of Vertebrates," Philadelphia, The Blakiston Company.). Fig. 378. Chirotes, an almost legless lizard. (Courtesy, Brehm: "Tierleben," Leipzig, Bibliographisches Institut.) elastic ligament. No sternum. .Movable eyelids, tympanic cavity and membrane are lacking. Parietal organ not eyelike. No urinary bladder. Many snakes are viviparous. In snakes, as in lizards, the movable quadrate increases the extent to which the mouth may be opened, but in snakes the potential "gape" is further greatly increased by the elastic connections of the several bones of the upper jaw and of the two rami of the lower jaw. 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 Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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