•348 Dr. C. W. Andrews — A New Species of Tetrahelodon. 



coronoid process the upper border is strongly concave ; the short 

 coronoid process, which does not rise so high as the condyle by about 

 4 or 5 cm., is curved strongly backwards. The anterior border of the 



Mandible of Tetrahelodon dinotherioides, sp. nov., Andrews, from the Loup Fork 

 Beds, North- Western Kansas. 



A. Right side of mandible, jV nat. size. 



B. Upper view of entire mandible, -3^2" i^t- size. 



C. Upper view of third right lower molar, | nat. size. 



alv. = alveolus of tusk ; cond. = condyle ; cor. = coronoid process ; m^ = third lower 

 molars. 



Drawn from original specimen in the Geological Department, British Museum 

 (Natural History) . 



ascending ramus is convex above but concave below, passing into 

 the outer face of the horizontal ramus a little in front of the posterior 

 end of the last molar tooth. The position formerly occupied by the 



