SUCCESSIVE MAMMALIAN FAUNAS 



279 



slender body, short and massive limbs and elephantine feet. 

 In appearance, these strange beasts were not altogether unlike 

 the Hippopotamus and were perhaps more or less amphibious 

 in habits. The other family of jAmblypoda, the fuintatheres, 



Fig. 142. — The commonest of Wasatch ungulates, the tamblypod, fCoryphodon testis. 

 Restored from a skeleton in the American Museum of Natural History. 



have not yet been registered from the Wasatch, but they will 

 undoubtedly be found there, as they were unquestionably 

 present at that time. 



All of the preceding groups were of the archaic, non- 

 progressive type and have long been extinct. With the sole 

 exception of one fcreodont family (fMiacidse) and perhaps 

 some of the insectivores, they have no descendants or repre- 

 sentatives in the modern world. All of them appear to have 

 been indigenous and derived from North American ancestors, 

 though it is possible that a few were immigrants. We now 

 turn to the orders which were more significant of the future, 

 because they had within them the potency of a far higher 

 development. These progressive groups were all immigrants, 

 coming to North America from some region which cannot yet 



