208 



THE AMERICAN MUSEUM JOURNAL 



among the fragments of the skeleton. Care- 

 ful and thorough piecing has enabled us to 

 make a much more complete and more accu- 

 rate reconstruction of the skull, and to recon- 

 struct the skeleton with but little missing 



nent. They are not found in the Tertiary 

 formations, and make their appearance first 

 at the end of the Pliocene and in the Pleisto- 

 cene (Pampean formation). They were in- 

 vaders from North America, accompanied by 



Fossil skeleton of extinct deer, found forty years ago in the Pampean formation near Buenos Aires, 

 and now mounted in the American Museum. This animal was a contemporary of the great ground 

 sloths, to.\odonts, and other curious extinct creatures that inhabited South America in Pleistocene times 



and practically nothing of any importance 

 doubtful, save as to the vestiges of the side 

 toes, of which no remains could be found al- 

 though they were presumably present in the 

 skeleton. 



Geologically speaking, deer are rather re- 

 cent arrivals in the South American conti- 



mastodons, camels, peccaries, horses, and 

 tapirs, and by saber-toothed tigers and other 

 northern Carnivora. This invasion seems to 

 have been made possible by the union of the 

 two Americas at Panama and the raising of 

 the isthmus to a height considerably above 

 its present level, aided by a lowering of tern- 



