874 —«O. ©. Marsh—Vertebrate Life in America. 
belong originally to the Old World are in reality true Amer- 
ican types. mong these were the Horse, Rhinoceros, an 
Tapir, all the existing odd-toed Unguliates, and besides ‘these 
the Camel, Pig, and “Deer. All these I — and many 
others, went to Asia from our North West Coast. It must, for 
the present, remain an open qvestion ils we may not 
continent. On this point there is some confusion, at least in 
ames. The Himalayan yet ae called Upper Miocene, and 
so rich in Proboscideans, indicate in their entire fauna that 
they are more recent than our Niobrara River beds, which, for 
apparently good reasons, we regard as Lower Pliocene. The 
) 
better standard for comparison of faunas, I have preferred to 
retain the names already applied to our divisions, until the 
strata of the two continents are more satisfactorily codrdinated. 
he extinct Rodents, Bats, and Insectivores of America, 
although offering many suggestive hints as to their relation- 
ship with other groups, and their various migrations, cannot 
now be fully discussed. There is iittle doubt, however, that 
the Rodents are a New World type, and, according to A Aes 
ga weed Saan a their origin i n North America. 
a 
followed the huge Edentates to South America, and the Ungu- 
lates across pies to Europe. With this genus went scene 
e 
was seat before nie reached it. 
The Edentates, in their southern migration, were Lair 
remains of the last have yet ties found: oth of co. The 
Mastodon, Elephant, Llama, Deer, city and ott am- 
mals, followed the same path y the Mastodon, Elephant, 
