The Rise of tlie Mammals 



its members were common in Oregon and 

 Washington, in Nebraska, Dakota, and Texas. 

 They extended to Florida, and the probability 

 is that they extended into South America even 

 to Patagonia, so that the original stock of the 

 present llamas came from North America. It 

 is also thought that during this time the early 

 camels emigrated from this country to Asia 

 and that while the race disappeared completely 

 here, it endured there, giving rise to the modern 

 camel and dromedary. It is interesting to re- 

 call that in 1853 the United States Govern- 

 ment imported a number of camels for use in 

 the desert regions of the Southwest, where, 

 ages before, the predecessors of these animals 

 were abundant. With the camels were true or 

 single-toed horses, and the great sloths and 

 glyptodons of South America, saber-toothed 

 tigers, as well as true cats, so that the life of 

 the period comprised a mixture of temperate 

 and tropical animals. 



Such is a glimpse of the procession of life 

 as it passed onward through the Cenozoic era 

 an era remarkable for the development of 

 17 249 



