. Osteology of Haplocanthosaurus : with description of a new species, and remarks on the probable habits of the Sauropoda and the age and origin of the Atlantosaurus beds. s, indicating in each in-stance an animal of identically the same age. Figs. 3 and 4 are side views respectively of thesupposed sixth and the first dorsal. They are intro-duced here for direct comparison with one anotherand to show the great disparity in structure exist-ing between these two vertebra?. These differencesbecome more apparent after an examination ofplate A, where posterior and anterior views of thesame vertebrf
. Osteology of Haplocanthosaurus : with description of a new species, and remarks on the probable habits of the Sauropoda and the age and origin of the Atlantosaurus beds. s, indicating in each in-stance an animal of identically the same age. Figs. 3 and 4 are side views respectively of thesupposed sixth and the first dorsal. They are intro-duced here for direct comparison with one anotherand to show the great disparity in structure exist-ing between these two vertebra?. These differencesbecome more apparent after an examination ofplate A, where posterior and anterior views of thesame vertebrffi are also given. The greatest structural differences exhibited inthese two vertebrae are to be found in the relativeheight of the neural arches, the form and positionof the capitular rib facets, the form and positions ofthe transverse processes and the height and form of the neural spine. All these andmany other differences of only less importance will become apparent as we describethe sixth dorsal in detail. Sixth f Dorsal (Plate I., Fig. (3). — This vertebra is complete save a smallpart of the anterior end of the centrum and a portion of the upper part of the. Fic. 3. Sixth (?) dorsal of type ofHaplocanlliosaurus priscu$ (No. .jTS)seen from right side, Ij natural size,pzlj postzygapophysial lamina ; hi,horizontal lamina; ol, oblique lamina. Fig. 4. First dorsal of same, sameview ; ol, oblique lamina ; at, inferiorblade of diapophysial lamina : I. tulier-cular rib facet; c, capitular rib facet;6, surface for muscular attachment ofscapula, tV natural size. hatcher: osteology of haplocanthosaiius 11 neural spine. The entire length of the spine is represented, but the margins, exceptthe posterior, are weathered away and have been restored in plaster. It thushappens that the drawing represents the top of the spine less complete than itactually is. The centrum was opisthoccelous with the cup moderately deep and the ball at theanterior extremity rather more than represen
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Keywords: ., bookcentury1900, bookdecade1900, bookidosteologyofh, bookyear1903
