HOLLAND AND PETERSON: OSTEOLOGY OF THE CHALICOTHEROIDEA. 277 
restored by Mr. Peterson. The possession of these seven specimens permits an 
accurate description of this member of the vertebral series. 
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Fig. 45. Second dorsal of Moropus (No. 1716, C. M. Cat. Vert. Foss.). 4. 1, posterior view; 2, lateral 
view; 3, anterior view. 
The spine is longer than in the first dorsal, and viewed laterally tapers at 
the top, with the exception of specimens 1713 and 1716, which are widened and 
flattened out at their upper ends. No. 1713 gives evidence of having received 
injury during the life of the animal to which it belonged. The postzygapophyses 
are malformed and the spine is twisted to the left. The spine in all specimens is 
triangular in horizontal section near its origin, with the base of the triangle behind, 
and the apex pointing forward. Above the mid- 
dle it becomes oblong-oval in cross-section. The 
transverse processes are smaller and the articulat- 
ing faces of the prezygapophyses and the postzy- 
gapophyses are much smaller than in the first dor- 
sal. The prezygapophyses are oblique, transversely — Fic. 46. Inferior view of second 
dorsal of Moropus (No. 1716, C. M. 
oblong, and look upward and inward; the postzy- 
Cat. Vert. Foss.). >. 
gapophyses are subtriangular or rudely oval and 
look backward and downward. The anterior articulating face of the centrum 
looks forward and somewhat downward; the posterior articulating face is almost 
vertical, looking back and very little, if at all, upward. The epiphysis in front, 
