. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. ANATOMY OF VERTEBRATES. 57 48 from the 32 anterior ones, directed backward in the first ten, and forward in the hist ten, where tliey are nnusiialljr k)ng, and tipped with a coat of hard dentine ; these perforate the oesophagus, and serve as teeth. The jaws are merely roiigliened by rudiments of teeth. The relation of this singular condition of the cervical hypapophyses and the modification of the dental system to the food of the Deirodon will be explained in the chapter on teeth. § 22. Vertebral column of Lacertki. — Th
. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. ANATOMY OF VERTEBRATES. 57 48 from the 32 anterior ones, directed backward in the first ten, and forward in the hist ten, where tliey are nnusiialljr k)ng, and tipped with a coat of hard dentine ; these perforate the oesophagus, and serve as teeth. The jaws are merely roiigliened by rudiments of teeth. The relation of this singular condition of the cervical hypapophyses and the modification of the dental system to the food of the Deirodon will be explained in the chapter on teeth. § 22. Vertebral column of Lacertki. — The anguine or snake- like reptiles, with fixed upper-jaws and a scapular arch, pass gradually, by other forms with rudiments of limbs (^Pseiidopus), to the slender-bodied long-tailed lacertians. The dis- tinction is effected through the establishment of a costal arch in the trunk, completed by the addition of a hajmal spine (sterniun) and hajma- pophyscs (sternal ribs) to the pleurapciphyses or vertebral ribs, which arc alone ossified in Oph/d/a. The A'ertebra; of the trunk have the same prococlian character, i. e., with the cup anterior and the ball Ijchind, fig. 48 ; the latter, c, being usually less prominent, more oblique, and more trans- versely oval than in serpents. The vertebra; also are commonly larger, and always fewer in number than in the typical Ophidia. Those of the Iguanas retain the superadded articular surfaces of the zygosphene, fig. 48, zs, and zygantrum ; but I have not met with these superadded processes in other lacertians. In the. Trunk vertobni. Igiiium 49. 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 Owen, Richard, 1804-1892; Cornell University. College of Veterinary Medicine. Flower-Sprecher Veterinary Library. fmo. London, Longmans, Green
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