. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. 52 ANATOMY OF VERTEBRATES. 45. RlcoU'liiii of ricslosaums. OLXIII. rises from the centrum to the neurapophysis. This takes i'place at the fortieth vertebra in the Plesiosaurus liomalo- spontlylus of the Whitby Lias, but, in the PI. dolichodeirus, fio-. 45, of the Dorsetsliire Lias, at about the thirtietli, c. The dorsal region is arbitrarily commenced by the vertebra in which the costal surface begins to be supported on a diapo- physis; this progressively in- creases in length in the second and third dorsal, continues as
. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. 52 ANATOMY OF VERTEBRATES. 45. RlcoU'liiii of ricslosaums. OLXIII. rises from the centrum to the neurapophysis. This takes i'place at the fortieth vertebra in the Plesiosaurus liomalo- spontlylus of the Whitby Lias, but, in the PI. dolichodeirus, fio-. 45, of the Dorsetsliire Lias, at about the thirtietli, c. The dorsal region is arbitrarily commenced by the vertebra in which the costal surface begins to be supported on a diapo- physis; this progressively in- creases in length in the second and third dorsal, continues as a transverse process to near the end of the trunk, and on the vertebra, S, between the iliac bones, 62, it subsides to the level of the neurapophysis. In the caudal vertebrre the costal surface gradually descends from the neurapophysis upon the side of the centrum; it is never divided by the longitu- dinal groove wliich, in most Ph'siosanri, indents that sur- face in the cervical vertebra\ The neural arches are com- monly unanchylosed with the centrum. The lono- and lara;e spinous processes, in contact along the trunk and base of the neck, nuist have restricted the bending movements chiefly to the lateral directions. The plcurapophyses gain in length, and lose in terminal breadth, in the hinder ecrvicals; and become long and slender ribs m the dorsal region, curving outward and downward so as to encompass the upper two-. 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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