SUBORDER A 



TYPOTHERIA 



231 



The following genera, of about the size of a hare and restricted to the 

 Eocene (Notostylops beds) and the Oligocene of Patagonia, are forerunners 

 of the two families immediately to be considered. 



Notopithecus, Adpithecus (Fig. 313), Transpithecus, Infrapithecus, etc., 

 Ameghino. Notostylops beds. Gmlelmoscottia Ameghino. Astraponotus beds. 



Fig. 315. 



Interatherium rohuHum Ameghino. Upper Miocene (Santa Cruz beds), Patagonia. A, Skull, upper aspect. 

 B, Palate, etc. C, Interatherium extensum Ameghino, Same formation. Right ramus of lower jaw, upper 

 aspect. D, Same, outer aspect, '*/4. £?, Right fore foot, i*". Right hind foot. i/i. (After Ameghino.) 



3.1.4.3. 



Family 2. Interatheriidae Ameghino. 



, , „ L is rooted, all the other incisors prismatic. Po and P. simple. 

 3.1.4.3. ^ ^ 3 4^ 



Upper molar with inner valley. Mastoid fitted toith cellular tissue, zygomatic arch 



