36 GUIDE TO THE FOSSIL MAMMALS AND BIRDS. 



Pier-case iiud the basal l.ones in its feet are not entirely fused together. 

 13. There were no camels later than the Pliocene period m 



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

 tatives of the llamas wandered over the newly emerged 

 Isthmus of Panama to South America, where they have 



