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96 MEMOIRS OF THE CARNEGIE MUSEUM 
Siath Cervical. — The base of the neural spine of the sixth cervical vertebra is 
present, and the size indicates a proportionally less developed process than is the 
case in the corresponding bone in Archeothe- 
rium. As in the preceding vertebra, the cen- 
trum is relatively more opisthoccelous than in 
the sixth cervical of the Princeton specimen. 
The inferior keel is also sharper and terminates 
in front in a swollen area. The anterior face of 
the centrum extends down over this area, which 
adds to the convexity of the centrum in a 
peculiar manner, quite unusual in most of the 
Artiodactyla, and is not unlike what is seen 
in the recent horse. The diapophyses are of 
about the same proportionate size as in Archxo- 
theriwm, but the inferior lamelle are relatively 
more developed, which is remarkable when one 
: bears in mind that the neural spine is relatively 
Fig. 43.° Posterior and Lateral Views of less developed, while the neural arch has about 
the Seventh Cervical of D. hollandi Peterson. the game proportions in both genera. 
} nat. size. 3 a 2 
Seventh Cervical. — As in the preceding ver- 
tebree the neural spine of the seyenth cervical vertebra of Dinohyus is relatively 
smaller than in Archxotheriwum. The postazygapophysis is placed higher up than in 
Archxotheriwm, but is less concave and looks outward more decidedly than in the 
Oligocene genus. The pedicle is more rounded and the postero-inferior portion of 
the centrum is proportionally somewhat heavier, and has decided tubercles on 
either side of the median line, which are absent in Archzothe- 
rium. The transverse process has the same proportions as in 
the Princeton specimen, and, as in that specimen, is not perfor- 
ated by the vertebrarterial canal. 
First Dorsal Vertebra.—In the type of Dinohyus hollandi 
there are fourteen dorsal vertebrae which were found in the 
quarry articulated with one another by their zygapophyses. — jyq, 44. tnterior View 
The first dorsal vertebra is characterized by a long and very of Seventh Cervical of D. 
heavy neural spine greatly exceeding in length that of the ‘adi Peterson. } nat. 
size. 
seventh cervical. The neural spine has about the same rela- 
tive size as in the Princeton specimen, but the postzygapophysis is more distinctly 
separated from the transverse process by a constricted area, and the centrum is 
