190 NEBRASKA GEOLOGICAL SURVEY 



23. Pliohippus 



24. Hipparion 

 Proboscideans 



25. Tetrabelodon zvillistoni, sp. nov. 



26. Mastodon euhypodon? 



27. Mastodon, undetermined 



28. Mastodon morrilli, sp. nov. 



THE UNIVERSITY OF NEBRASKA. 

 December, 1913 



LIBRAE? 



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