DESCRIPTIONS OF SPECIES OF PLEISTOCENE VERTE- 

 BRATA, TYPES OR SPECIMENS OF MOST OF WHICH 

 ARE PRESERVED IN THE UNITED STATES NATIONAL 

 MUSEUM. 



By Oliver P. Hay, 



Associate of the Carnegie Institution of Washington. 



INTRODUCTION. 



In the paper which follows there are described fossil remains of 

 Pleistocene Mammalia, which have been found at three principal 

 places: Denver, Colorado; Wenatchee, Chelan County, Washington; 

 and Anita, Coconino County, Arizona. In addition to the species 

 from these places there are described remains of camels and of rodents 

 and lagomorphs from various localities west of the Mississippi River; 

 also bones of a sloth from near Williston, Levy County, Florida. 



1. COLLECTION OF FOSSIL VERTEBRATE REMAINS FOUND AT DENVER, 



COLORADO. 



In the United States National Museum there is a small collection 

 of fossil mammals which was presented in 1915 by Prof. George L. 

 Cannon, of the Eastern High School of Denver. Nearly all of these 

 remains had been found by Mr. E. Blackburn, about 1902, and given 

 to Professor Cannon. They had been discovered mostly about one- 

 half mile south of Fairmount Cemetery, on the western side of Platte 

 River, in the fine deposit which was laid down by Platte River and 

 regarded sometimes as loess. The depths at which the bones were 

 found are not known. The Quaternary geology of the quadrangle 

 has been described by Dr. S. F. Emmons, aided by Professor Cannon. 1 

 According to the geological map of that quadrangle, 2 the Quaternar} r 

 deposits along the Platte consist of ancient river drift (Terrace) and 

 of a later alluvium. The former is mapped along the eastern shore 

 of the river from Denver northward. On the western shore there is 

 indicated only the later alluvium. Nevertheless, in this later deposit 

 there have been found remains of horses and camels. The present 

 writer believes that these deposits are about as old as the first inter- 

 glacial stage. It can not be said that deposits laid down at an early 



i Mon. U. S. Geol. Surv., vol. 27, 1S96, pp. 255-278. 

 » Idem, pi. 2. 



Proceedings U. S. National Museum. Vol. 59-No. 2391. 



599 



