HISTORY OF THE fLITOPTERNA 



497 



toid process of the axis was less modified than in the latter, 

 being relatively longer and more conical. The body was 



C 



Fig. 246. — Development of the skull in the tMacrauchenidae. A, jTheosodon. 

 B, ^Scalibrinitherium. (After Ameghino.) C, ]Macrauchenia. (After Burnieister.) 



rather short, and the spines of the trunk- vertebrae were pro- 

 portionally higher and more prominent. No caudal vertebrae 



2k 



