PANTODONTA. 



515 



The fibular facet is vertical and is extensive, and the internal lateral is well 

 marked. 



On the other hand the coracoid process is produced into a curved 

 hook, and is thus more largely developed than in the Frohoscidians or 

 PerissodacUjles. The neck is longer than in the Dinocerata. But one 

 family of this suborder is yet known, the Coryphodontidai. Its characters 

 and those of the genus Corypliodon were fully described by mj^self in the 

 final report of the United States Explorations and Surveys West of the 

 One hundredth Meridian, by Captain Wheeler, iv, pt. ii, p. 187-206, and to 

 this work I refer for full details 



History. — The first piece recognized as belonging to a distinct genus, 

 under the name of Corypliodon, was described by Professor Owen in 1846. 

 This was a fragment of the mandible, supporting the last inferior molar. In 

 describing it, Owen noticed the peculiar form of the posterior part of the 

 ramus. He also referred to some superior molars, one of which is figured by 

 Cuvier (Ossemens Fossiles, pi. 77, fig. G) as 

 probably belonging to the same genus. 

 These were alluded to by the French anato- 

 mist as the Lophiodon de Soissons and the 

 Lophiodon de Lyonnais. Owen named the 

 species observed by him Corypliodon eoccmus, 

 and it is believed that the teeth described by 

 Cuvier belong to another species, to which 

 De Blainville gave the name Corypliodon 

 anthracoideus. Little, however, was known 

 of this form until ten years later, when Pro- 

 fessor Hebert, of Paris, obtained some addi- 

 tional material from Meudon near Paris, and 

 other localities. In the Annales des Sciences 

 Nature lies for 1856, he gave a full account 

 of the characters of the dentition, and described the femur. He explained 

 correctly the homologies of the dental structure, and added a species, C. 

 oiveni, which is of smaller size than the C. eoccentis. 



The first American species was made known by the writer in Feb- 



FiG. '2'2. Eight posterior foot of a species 

 of Coryphodou lialf natural size. From 

 Report Expl. W. of lUOtli Meridiau, 

 Wheeler, iv, pt. ii. 



