NO. 20 



RECOGNITION OF PLEISTOCENE FAUNAS HAY 



forms here treated have escaped him. He has, besides, examined 

 a considerable number of collections in our museums and universi- 

 ties and noted the materials found in them. 



Figure I is intended to show the . distribution of the American 

 mastodon (Mammut americanum}. The writer has records of 

 over 325 finds of this animal. In some regions, as New York and 

 Indiana, it is impossible to indicate on the map all the localities ; 

 hence, one dot represents often two or more neighboring localities. 

 In Indiana more than 30 are known. While the remains of this 

 great proboscidian have been found from Cape Breton Island to the 

 Pacific coast and to Florida and Texas, they are seen to be especi- 



FIG. i. Distribution of the Pleistocene mastodon, Mammut americanum. 



ally abundant in undisturbed deposits that were laid down in lakes 

 and ponds on the Wisconsin drift. It is certain, therefore, that the 

 animal lived in those regions long aftef the last ice-sheet had re- 

 tired from the country. Inasmuch, too, as teeth and bones not yet 

 distinguishable from these post-Wisconsin mastodons have been 

 found in Aftonian deposits, we must conclude that the species in- 

 habited parts of the country during nearly the whole of the Pleis- 

 tocene. 



Figure 2 represents the distribution of known discoveries of the 

 hairy mammoth (Elephas primigenius} . The number is not large, 

 but it is intended to indicate specimens that have been determined 

 with considerable certainty. The writer has notes on more than 

 200 discoveries of remains of elephants which cannot be assigned 



