PLATE IV. 



Protorcodon paradoxicus. Skull, from left side. (Depressed by crushing.) 

 Pfofoi-eodon paradoxicus. Left upper dentition. 

 Protagriocha:rus annectens. Right upper dentition, side view. 

 ProfagriocJiwrus annectens. Right upper dentition, crown view. 

 Proiagriocharus annectens. Left tarsus. TV'". , navicular ; C^., cuboid. 



Figures 26, 27, 28 are of the same individual, belonging to the American IVluseum of 

 Natural History. (No. 18 18.) 



{All figures of natural size.) 



