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
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