218 ANIMALS OF THE PAST 4 
bany, N. Y.; Field Columbian Museum, Chicago; Car- 
negie Museum, Pittsburg; Museum of Comparative 
Zoilogy, Cambridge, Mass. There is no mounted skele- 
ton in the United States National Museum, nor has there — 
ever been. | P 
The heaviest pair of tusks is in the possession of T.O. 
Tuttle, Seneca, Mich., and they are nine and one-half — 
inches in diameter, and a little over eight feet long; — 
very few tusks, however, reach eight inches in diameter. 7 
The thigh-bone of an old male mastodon measures from — 
Sorty-five to forty-six and one-half inches long, the hu- 
merus from thirty-five to forty inches. The height of — 
the mounted skeleton is of little value as an indication of 
size, stnce tt depends so much upon the manner in which — 
the skeleton is mounted. The grinders of the mastodon — 
have three cross ridges, save the last, which has four, and 
a final elevation, or heel. This does not apply to the — 
teeth of very young animals. The presence or absence 
of the last grinder will show whether or not the animal is 
of full age and size, while the amount of wear indicates — 
the comparative age of the specimen. | 
The skeleton of the “ Warren Mastodon” is described — 
at length by Dr. J. C. Warren, in a quarto volume en- — 
titled “* Mastodon Giganteus.” There is much informa- 
tion in a little book by J. P. MacLean, “ Mastodon, 
Mammoth, and Man,” but the reader must not accept all — 
its statements unhesitatingly. The first volume, 1887, — 
