. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. VERTEBRAL COLUMN 55 the Stegocephali of the Carboniferous period, as well as the Perennibranchiata, Derotremata, and many Myctodera, possess simple biconcave bony centra without differentiation of definite Thus the bony parts of the vertebrae of Urodeles are not formed from the cartilage .surrounding the notochord, but in -Liyf. 11 FKI. 44.—LONCUTUDINAL SECTION THROUGH THK VERTEBRAL CENTRA of VARIOUS URODELES. A, Ra/nodon xiltericns ; B, Amblystoma tigrinum ; C, GyrinophUus porphyriticus (1, II, III, the t
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. VERTEBRAL COLUMN 55 the Stegocephali of the Carboniferous period, as well as the Perennibranchiata, Derotremata, and many Myctodera, possess simple biconcave bony centra without differentiation of definite Thus the bony parts of the vertebrae of Urodeles are not formed from the cartilage .surrounding the notochord, but in -Liyf. 11 FKI. 44.—LONCUTUDINAL SECTION THROUGH THK VERTEBRAL CENTRA of VARIOUS URODELES. A, Ra/nodon xiltericns ; B, Amblystoma tigrinum ; C, GyrinophUus porphyriticus (1, II, III, the three anterior vertebrae); L), Salamandrina perspicillata. Ch, notochord ; CK, intravertebral cartilage and fat-cells ; Gp, concave posterior face, and Gk, convex anterior face of centrum with articular socket and head ; Jvk, invertebral cartilage; K, superficial bone of centrum; Liyt, intervertebral ligament; Mh, marrow cavity; If, transverse process; S, intravertebral constriction of notochord in Amblystoma, without cartilage and fat-cells ; **, intervertebral cartilage. connective tissue, there being only an intervertebral cartilaginous zone, extending into the ends of the centra. In the Anura, on the 1 In certain of the Stegocephali incomplete hoops of bone, the intercentra, and pleurocentra, twice as numerous as the arches, surrounded the persistent notochord (cf. the caudal region in Amia and Elasmobranchs, p. 50),. 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, Macmillan and co. , limited
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