544 



THE AMERICAN NATURALIST [Vol. XLI1 



ccras, Miolabis, Meryehyus, Thinohyus, Parahippus, Moropus, 

 Brachypsalis and other animals. 



The specimen is referred to the genus Aeeratherium, and the 

 specific name of egrcgius is proposed. It is separated from its 

 contemporary Diceratherium. by the absence of horn cores, or 



any trace thereof on the nasals; by a relatively longer and pro- 

 portionately narrower skull; by a larger first upper premolar, 

 and by many minor features. 



The nasals are broad and flattened posteriorly, narrowing 

 rapidly anteriorly, and extending about one half inch in front 



of the premaxillaries. The temporal ridges unite in forming a 

 sagittal crest, which rises quite abruptly, adding materially to 

 the general saddle-shaped appearance of the skull. 



A more complete report will appear in volume three of the 

 Nebraska State Geological Survey. 



