124 



COPE 



small size. The known Barytheria have three digits on 

 each foot, and the later forms reached large proportions, 

 with heavy body and short legs. 



Fig. 59. — Cm'ypho'don elephaniopus Cope ; skull; from below, 2-9 natural size. 

 Original. Frona the Wasatcli Eocene of New Mexico, 



The Amblypoda are, restricted to the Northern Hemis- 

 phere, and to the Postcretacic and Eocene systems, where 

 their remains abound both in Europe and North America. 

 They are the only order of Ungulata with superior molars 

 constructed on a tritubercular basis, and the inferior molars 

 on the tuberculo-sectorial pattern. The earlier forms from 

 the Puerco are the smallest ; those of the Lower Eocene 

 (Suessonian, Wasatch) are next in size (Fig. 59) ; while 

 those of the Middle Eocene (Bridger), which have been 

 found in North America only, are often. of gigantic size 

 (Dinocerata) (Fig. 60), and have the cranium adorned with 

 horny processes. 



There are three well-marked suborders of this order, 

 with the following characters : 

 Astragalus with a head ; femur with third 



trochanter ; superior incisors present ; Taligrada. 



Astragalus without head; a third trochanter 



and superior incisors ; Pantodonta. 



