usro. 8. 



ON A NEW VERTEBATE GENUS FROM THE NORTHERN PART 

 OF THE TERTIARY BASIN OF GREEN RIVER. 

 By Edward D. Cope, A.M. 

 Anaptomorphtts cumulus. Cope. 

 Dentition of the ramus mandibuli, In. 2, C. 1, P.M. 2, M. 3, total 1G ; 

 identical in number to those of Limia and Homo. It differs in many re- 

 spects from these ; there is no interruption in the series near the canine, 

 and the symphysis though massive, is not co-ossified. Further details 

 are, the last molar is three-lobed and elongated behind. The composition 

 of the crowns of the preceding molars consists of four opposite lobes, which 

 are very stout, and connected transversely by a thin ridge behind, or in 

 close contact in front. The premolar tooth which is best preserved, is a 

 perfect second, which, while having two roots, possesses a crown which 

 stands almost entirely on the anterior, presenting a curved sectorial crest 

 forwards and upwards. 



Measurements. M. 



Length dental line 0.0148 



•' of last molar 0030 



" " ante-penult .0025 



Widthof " 0020 



Length of three molars preserved .0070 



October 12th, 1872. 



