HOLLAND AND PETERSON: OSTEOLOGY OF THE CHALICOTHEROIDEA. 269 
Mransverse qiameterior vertebrantenalicanally.. 0. sees sess descee ess se asc acre cesses. oees 15 
Supero-inienor diameter or venbebrarvenialucanala st ssc:4. Sem acto Goes crc buen cn eases es ces aes 27 
The Seventh Cervical Vertebra. 
In the seventh cervical vertebra a still more profound change in structure 
than has been observed in the sixth takes place. The vertebrarterial canal wholly 
Fig. 39. Lateral view of seventh cervical of M. Fic. 40. Ventral view of seventh cervical of M. ela- 
elatus (No. 1604). +. tus (No. 1604). 3. 
disappears. The transverse process becomes a solid bony mass, subtriangular 
in cross-section, elongated, and pointing downward and outward. The posterior 
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Fig. 41. 1, lateral view of seventh cervical of M. petersoni (No. 1703A); 2, posterior view of do. 
