Geological magazine . Fig. 5.—Posterior dorsal vertebra of same species (side view).Fig. 6.—The same vertebra (front view). The Sacrum.—The sacrum was strengthened by union of severalvertebras, ten being coossified in one specimen of Triceratops (Woodcut,. Fig. *7.—Sacrum of Triceratops porosus, Marsh, (Seen from below, one-eighth natural size.) a, anterior face of first sacral vertebra ; /. posterior face of last sacral vertebra ; i. neural spine of last vertebra ; 2. anterior zygapophysis of first vertebra ; I—10, transverse processes left side. 198 Prof. 0. C. Marsh—Oigantic Ceraiopsidce. F
Geological magazine . Fig. 5.—Posterior dorsal vertebra of same species (side view).Fig. 6.—The same vertebra (front view). The Sacrum.—The sacrum was strengthened by union of severalvertebras, ten being coossified in one specimen of Triceratops (Woodcut,. Fig. *7.—Sacrum of Triceratops porosus, Marsh, (Seen from below, one-eighth natural size.) a, anterior face of first sacral vertebra ; /. posterior face of last sacral vertebra ; i. neural spine of last vertebra ; 2. anterior zygapophysis of first vertebra ; I—10, transverse processes left side. 198 Prof. 0. C. Marsh—Oigantic Ceraiopsidce. Fig. 7). The middle or true sacral vertebrfe have double transyerseprocesses, diapophyses being present, and aiding in supporting theilium. This character has been seen hitherto, in the Dinosauria,only in Ceratosaurus and some other TJieropoda. The main support of the pelvis was borne by four vertebrae,which evidently constituted the original sacrum. In front of these,two others have only simple processes, and apparently were oncedorsals or lumbars. Three vertebrae next behind the true sacrumhave also single processes, and the fourth, or last of the series, hasthe rib process weak, and not reaching the ilium (Woodcut, Fig. 7).Seen from the sid
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectgeology, bookyear1864
