HISTORY OF THE EDENTATA 



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■\Peltephilus the face was very short and broad, and the lower 

 jaw was horseshoe-shaped, the two halves coossified at the 

 symphysis, which is not true of any other armadillo. (4) 

 Quite the opposite extreme was displayed by tStegotherium, 



Fig. 293. — Skull of ^Proeutatus, Santa Cruz. Princeton Univer.sity Museum. 



in which the face was drawn out into a very long, slender and 

 tapering muzzle ; the lower jaw was extremely weak and thin, 

 the posterior, ascending portion low and ill-defined, the condyle 



Fig. 294. — Skull of jStegolherium, Santa Cruz. Princeton University Museum. 



and coronoid process much reduced. No other known arma- 

 dillo has such fragile jaws, and there was a distinct likeness in 

 the skull to that of the Ant-Bear. 



Aside from carapace and skull, the skeleton of the Santa 

 Cruz armadillos was surprisingly modern. The vertebrae of 

 the neck were coossified, those of the lumbar and posterior 

 dorsal regions had the extremely complex articulations and the 



