EVOLUTION OF ELEPHANTS 373 



Exclusive of a number of forms supposedly new, the better- 

 known, described representatives of the Proboscidea in 

 Nebraska are Tetrabelodon willistoni, T. productus, T. lulli, 

 T. campester, T. euhypodon, Eubelodon morrilli, Mammut 

 americanum, M. Tnirificum^ Elephas hayi, E. imperator, E. 

 columhi, and E. primigenius. 



The material in the State Museum at the University of 

 Nebraska, on which these data are based, belong to the 

 palseontological collections of the Hon. Charles H. Morrill. 



The famous mastodon skeleton, known as the "Warren 

 Mastodon," was discovered in the summer of 1845 in a 

 small valley near Newburg, New York. The remains were 

 found buried in a shellmarl layer, and a noteworthy cir- 

 cumstance was that the bones, instead of being black, had 

 the brown hue of a recent human skeleton that has been 

 constantly handled. After having been exhibited for a 

 short time in New York City and also in several New Eng- 

 land towns, the skeleton was bought by John Collins War- 

 ren, M. D., who was professor of anatomy in Harvard 

 University from 1815 to 1847. It was mounted in Boston, 

 in 1846, by Mr. N. B. Shurtleff, under Professor Warren's 

 direction; in 1849 it was remounted and was placed in a 

 fireproof building in Chestnut Street, Boston, later known as 

 "The Warren Museum." Here the skeleton remained un- 

 til 1906, when it as well as the other objects constituting 

 the W^arren Collection were acquired by the late Mr. J. 

 Pierpont Morgan, and donated by him to the American 

 Museum of Natural History, New York City. Professor 

 Warren published, in 1855, a monograph treating of this 

 remarkable specimen under the title: "The Mastodon Gi- 

 ganteus of North America." 



After its reception in the Museum the skeleton was re- 

 mounted and renewed, being completely disarticulated in 

 the course of this work, the separate bones being immersed 



