36 



GUIDE TO THE FOSSIL MAMMALS AND BIEDS. 



Mer-oaae There were no camels later than the Pliocene period in 

 North America. About that time, however, the represen- 



tatives of the llamas wandered over the newly emerged 

 Isthmus of Panama to South America, where they have 

 since nourished; while the true camels by some means 



