Archive image from page 57 of The dinosaurs of North America The dinosaurs of North America dinosaursofnort00mars Year: 1896 182 DINOSAURS OF NORTH AMERICA. axis are not auchylosed together, and the elements of the atlas are separate (PI. XXXI). The dorsal vertebrae are distinctly opisthocoelous. The posterior dor- sals have elongated transverse neural spines, and have deep cavities in the sides. An anterior dorsal is shown iu figs. 31-33. p. 1S1. There are four vertebrae iu the sacrum, all with cavities in the centra. Their transverse processes, or sacral ribs, are vertical plates with expa
Archive image from page 57 of The dinosaurs of North America The dinosaurs of North America dinosaursofnort00mars Year: 1896 182 DINOSAURS OF NORTH AMERICA. axis are not auchylosed together, and the elements of the atlas are separate (PI. XXXI). The dorsal vertebrae are distinctly opisthocoelous. The posterior dor- sals have elongated transverse neural spines, and have deep cavities in the sides. An anterior dorsal is shown iu figs. 31-33. p. 1S1. There are four vertebrae iu the sacrum, all with cavities in the centra. Their transverse processes, or sacral ribs, are vertical plates with expanded ends. The anterior caudal vertebras are plano-concave, and nearly or quite solid. The tail was elongated, and the chevrons are similar to those in crocodiles (PI. XXXIX). The vertebra; of Morosaurus are represented on Pis. XXXI-XXXIV. THE FORE LIMBS. The scapula is elongated and very large, and the shaft has a promi- nent anterior projection. The coracoid is small, suboval in outline, and has the usual foramen near its upper border. These two bones are well represented in PI. XIX, nearly in the relative position in which they were found. The humerus is very large and massive, and its radial crest prominent. This bone is nearly solid, and its ends were rough and well covered with cartilage. This is true, also, of all Fig. 34.—Cast of neural cavity in sacrum of Morosaurus lentus ; side view. One-fourth nat- ural size. i, i\ i', i'\ intervertebral foramina; v, v', v', v'', cavities in first, second, third, and fourth sacral vertebra-. the large limb bones in this genus. The radius and ulna are nearly equal in size. The carpal bones are separate aud quite short. The live metacarpals are elongated, and the first is the stoutest. The toes were thick, and the ungual phalanges were evidently covered with hoofs. In PI. XXXVIII, fig. 1, the restoration of the scapular arch and entire fore limb of one species of Morosaurus well illustrates this part of the skeleton. THE PE
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