. 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. Figs. 7 and 8, chevron betweencaudals 8 and 9, side and posteriorviews respectively, one-tenth nat-ural size. Figs. 9 and 10, chevron between 24 MEMOIRS OF THE CARNEGIE MUSEUM al)out the region of the ninth (jr tenth. Posterior to these, they rapidly becomeshorter and more slender. The rilisof the anterior and mid-dorsal region are muchexpanded proximally where they present a rather deep concavity on the posteriorsurface, wh
. 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. Figs. 7 and 8, chevron betweencaudals 8 and 9, side and posteriorviews respectively, one-tenth nat-ural size. Figs. 9 and 10, chevron between 24 MEMOIRS OF THE CARNEGIE MUSEUM al)out the region of the ninth (jr tenth. Posterior to these, they rapidly becomeshorter and more slender. The rilisof the anterior and mid-dorsal region are muchexpanded proximally where they present a rather deep concavity on the posteriorsurface, while the anterior surface in the same region is convex. Beyond this theybecome subcircular in cross-section and somewhat spatulate at their distal extremi-ies. The riljs of the posterior region are decidedly less expanded proximally andin the middle they are semicircular in cross-section. Figs. 11, 12 and 13 represent respectively anterior views of the supposedsecond, fourth and thirteenth ribs. The second rib has a length of 911 mm., the. Fig. 11. Anterior view of second? rib of right side, one-tenth nat. size. ,Fig. 12. Anterior view of fourth ? rib of left side, one-tenth nat. 13. Anterior view of thirteenth ? rib of left side, one-tenth nat. size. fourth 1,394 mm. and the thii-teenth 710 mm. Compared with the size of theanimal as a whole the ribs of Haploccuifliosnurnti are neither long nor the entire series the capitulum and tuberculum are well capitulum is pediceled the tuberculum is sessile, save in the anterior ribswhere it is also pediceled. The Pelvis (Plates IV. and V.). All the elements of the pelvis were found approximately in position and in asplendid state of preservation. The lliuiii (Plate IV., Fig. 3). — In general form the ilium resembles that of othermembers of the Sauropoda. In the present skeleton both ilia were found attachedto the sacrum which lay imbedded in the sandstones with the spines directed up-war
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