1902.] 



Osbor?i, Oligocene Titanotheres. 



93 



lar horns placed slightly in front of the eyes, vestigial in- 

 cisors, 1^, large canine teeth. Known from the base to the 

 summit of the Oligocene. 



Megaccrops Leidy applies to Titanotheres with broad 

 skulls, nasals progressively shortening, short horns rounded 

 or oval in section, shifting anteriorly, one or two pairs of 

 incisor teeth, |5-J, medium sized canine teeth. Known from 

 the base to the summit of the Oligocene. 



Probably related to this are the subgenera of the types 

 named Allops and Diploclomis by Marsh, differing from the 

 above in horn characters. Known chiefly from the Upper 

 Beds. 



Syuihorodon Cope includes Titanotheres with skulls of vary- 

 ing proportion, nasals slender and progressively shortening, 

 horns elongate and peculiar in being placed above the eyes 

 instead of shifting forwards, incisors vestigial 1^^, canines 



small, approximated. 

 Upper Beds. 



Known onlv from the Middle and 



