284 THE MAMMALIA. 



systematic relationship into which Cope l has placed 

 the Creodonta. 



The mammals from the Wasatch beds of Utah 

 and of New Mexico have been divided into fifty- 

 four species, most of which are distinguished by a 

 very small and evidently low form of brain, to 

 judge from the structure and position of its ports. 

 That of Coryphodon (Fig. 14) appears almost like 

 that of a reptile, and in this character the Hoofed 

 and Clawed Animals agree. They also agree in the 

 structure of their joints, the different parts of their 

 limbs, and also in the number of their toes, of 

 which five were observed in from forty-one to fifty- 

 four species. In the flesh-eaters there is no t-ar- 

 nassial tooth; in the plant-eaters no teeth with 

 crescentic crowns ; all the molars belong to the 

 type of tuberculate teeth, either in primitive sim- 

 plicity, or of that form where the tubercles are 

 compressed to the side, and coalesce into imperfect 

 transverse ridges. On this account the animals 

 have been named BniiotJu't-ia, and are arranged in 

 the following manner : 



Insectivora, Taeniodonta, Tillodonta, Creodonta, Mesodonta 

 Bunotheria. 



There can be no doubt that these Early Eocene 



1 See p. 72, note. 



