HISTORY OF THE EDENTATA 615 



^PeUephilus 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 iStegotherium, 



Fig. 293. — Skull of ^Proeutaius, Santa Cruz. Princeton University 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 iStegotherium, 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 skuU to that of the Ant-Bear. 



Aside from carapace and skull, the skeleton of the Santa 

 Cruz armadillos was siu-prisingly modern. The vertebrae of 

 the neck were coossified, those of the Itunbar and posterior 

 dorsal regions had the extremely complex articulations and the 



