. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. VERTEBRAL COLUMN. 41 different stages of development find a complete parallel in the phylogeny of tailed Amphibians, inasmuch as all fossil forms, the Stegocephala of the Carboniferous Period and the Labyrintho- donts, as well as the Perennibranchiata, Derotremata, and many Salamanders, possess simple biconcave vertebras, without differen- tiation into definite articulations. The bony parts of the vertebrae of Urodeles are not formed from the cartilaginous sheath of the notochord, but in th
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. VERTEBRAL COLUMN. 41 different stages of development find a complete parallel in the phylogeny of tailed Amphibians, inasmuch as all fossil forms, the Stegocephala of the Carboniferous Period and the Labyrintho- donts, as well as the Perennibranchiata, Derotremata, and many Salamanders, possess simple biconcave vertebras, without differen- tiation into definite articulations. The bony parts of the vertebrae of Urodeles are not formed from the cartilaginous sheath of the notochord, but in the surrounding connective-tissue, there being only an intervertebral cartilaginous. FIG. 32.—VERTEBRAL COLUMN OF Discoglossus pictus. Pa, articular processes ; Ps, spinous processes ; Pt, transverse processes of trunk vertebra ; Ptc, transverse processes of caudal vertebrae (urostyle, Oc] ; S W, sacral vertebra ; Ob, upper arch of first vertebra ; Sg, its lateral articular . surfaces ; Po, its anterior process ; E, ribs. zone, extending into the ends of the centra. In the Anura, on the other hand, as well as in Elasmobranchs, bony Ganoids, and the higher Vertebrata, the vertebrae are preformed in cartilage. In the Amira true articulations are always formed between the Vertebras, and, as a rule, the convexity is posterior, and the concavity / anterioT~(proccelous). A further difference is seen in the rela- /ty lions of the notoQho_rd,_which persists vertebrally longer than intervertobrally, a condition which leads towards the Reptiles. The configuration of the caudal region of the vertebral column must. 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 Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, New York, Macmillan
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