166 



MAMMALIAN DENTITION 



existent. In the Santa Cruz deposits of the Miocene of Pata- 

 gonia however many species of Armadillo were overwhelmed 

 in volcanic ash and these display less uniform characters than 

 the existing representatives. Stegotherium for example pos- 

 sessing only few teeth, and these so small that they were no 



Fig. 57-A and B. — Lateral aspect of skulls of: 



A. Armadillo (Dasypus sexcinctus, 9.314-2). 



B. Two-toed Sloth (Choloepus didactylus, 9.313-2). 



more than minute points in the gums, exhibits a facial skele- 

 ton and mandible very similar to those of the modern Anteater. 

 On the other hand Peltephilus, an Armadillo described by 

 Scott as looking like a tiny Rhinoceros in armor, had a man- 



