Douglass : Rhinoceroses from North Dakota and Montana 263 



Mf.ASUREMENTS. mm. 



Height of occiput 225 



Width of occiput 270 



Height of paroccipital processes 65 



Though the type of Aphelops ceratorhinus represents a large rhino- 

 ceros, portions of a skull, vertebrae, and limb-bones of another indi- 

 vidual (Carnegie Museum Catalogue 

 of Vertebrate Fossils, No. 842, from 

 the Madison Valley) indicate a very 

 much larger animal, possibly belong- 

 ing to a different species. The~greater 

 portion of the humerus is preserved 

 and an outline is given in Fig. 6. 



The measurements are as follows : 



mm. 

 Length of humerus from upper articular 



surface to distal end 487 



Whole length of humerus, estimated... 500 



Width of distal end, transverse 178 



Diameter of distal end antero-posterior. 124 



Thickness of shaft above distal trochlea 95 



Teleoceras? sp.? 



Carnegie Museum Catalogue of Ver- 

 tebrate Fossils, No. 840. 



This specimen is the top of a skull 

 with the nasals and occipital crest 

 complete. It came from the bluffs on 

 the east side of the Lower Madison 

 Valley a mile or two farther north than 

 the type of Aphelops ceratorhinus. 

 Like most of the remains of rhin- 

 oceroses from this region, the speci- 

 men was found in a bed of sand near 

 the bottom of the Upper Miocene 

 (Loup Fork) beds. The portion of 

 the skull which is preserved suggests 

 a somewhat different rhinoceros from 

 any other that has been named, but 

 there is not sufficient material on 



which to found a species. The following are some of the more 

 noticeable characteristics : 



Fig. 6. Humerus of Aphelops? sp.? 

 \. (No. 842.) 



