238 



NOTOUNGULATA 



ORDER VIII 



Family 3. Toxodontidae Ameghino. 



Cheek teeth very strongly compressed, narrower and (because of the fusion of 

 processes on the inner surface) simpler than those of the Nesodontidae. Upper molars 



Fig. 322. 



Nesodon imhricatus Owen. Upper Miocene (Santa Cruz beds), Patagonia. A, Palate of adult individual 

 with complete dentition. B, Right lower dentition. 1/3. (After Amegl\ino.) 



A B 



Fig. 323. 



Nesodon imbricatus Owen. Upper Miocene (Santa Cruz beds), Patagonia. A, Fore foot. B, Hind foot. 



1/5. (After Sinclair.) 



apparently consisting only of ectoloph and protoloph. Dentition often with a diastema, 

 dm to the degeneration of the canine and premolars. All of the teeth prismatic and 



