242 



NOTOUNGULATA 



ORDER VIII 



and without parastyle. Bidges of the inner side fused. Skull stout, with broad 

 occiput and massive, widely projecting zygomatic arch and nostrils deeply incised 

 between the thickened premaxillaries and the somewhat upwardly directed nasals. 

 The terminal phalanges are developed as broad hoofs, the astragalus and calcaneum 

 are stout and similar to those of Nesodon {according to Gaudry). 



Leontinia Ameghino. With canine. Ancylocoelus Ameghino. Without 

 canine. Henricofilholia Ameghino. Lower Miocene ; Pyrotherium beds. 



Colpodon Burm. Miocene ; Colpodon beds. 



Carolodarwinia, Stenogenium Ameghino. Oligocene (Astraponotus beds) 

 and Lower Miocene. 



Family 4. Homalodontotheriidae Lydekker. 

 (Ancylopoda Zittel, partim.) 



3 14 3 



' ' ' ' • Canines enlarged in both jaws, all of the remaining teeth inter - 



grading and very closely apposed, brachyodont. Upper molars are broader than long, 

 without spur on the inner side of the ectoloph but with outer and inner cingulum, the 

 lower molar having only an outer cingidum, Skull with a small brain-case, slightly 



Fig. 328. 



Homalodontotheriwii ounninghami Flower. Upper Miocene (Santa Cruz beds), Rio Gallegas, Patagonia. 

 Upper and lower cheek teeth. 2/5. (After Flower.) 



inflated in the mastoid region, short nasals, remotely situated and massive zygoma. 

 Manus with five slender metacarpals and retractile claws, cleft at the ends. Pes with 

 five short metatarsals, long calcaneum ami distally rounded astragalus. 



Homalodontotherium Flower (Fig. 328). Upper molars rounded and 

 trapezoidal. Humerus massive, with broad distal end and a long deltoid crest. 

 Tibia short and thick-set. Miocene ; Santa Cruz, Patagonia. 



Thoniashuxleya Ameghino. Upper molars are rounded and very broad. 

 Eocene ; Notostylops beds of Patagonia. 



Proasmodeus Ameghino. Oligocene; Astraponotus beds. Asmodeus 

 Ameghino. Upper molars quadrangular. Lower Miocene ; Pyrotherium 

 beds. 



Diorotherium, Prochalicotherium Ameghino. Lower Miocene; Pyrotherium 

 beds. 



