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 



A 



Fig. 246. — Development of the skull in the tMacrauchenidse. A, fTheosodon. 

 B, ^Scalibrinitherium. (After Ameghino.) C, ^Macrauchenia. (After Burmeister.) 



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

 portionally higher and more prominent. No caudal vertebrae 

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