PLATE VI. 



Fig. 1. Eutypomys parvus, Lambe ; left lower third molar, as seen from above ; four times 



the natural size. Type. Page 57. 

 Pig. 2. The same tooth, outer aspect ; four times the natural size. 

 Pig. 3. Megacerops assiniboiensis f Lambe ; coossified nasals, viewed from above ; one-half 



the natural size. Page 52. 

 Pig. 4. Magaeerops primitivus, Lambe; mandible viewed from the left; one-third the 



natural size. Page 49. 

 Pig. 5. The anterior end of the same specimen as seen from above ; one-half the natural size. 

 Fig. 6. Anthracotherium f pygmceum, Lambe ; right upper molar, crown view ; twice the 



natural size. Type. Page 25. 



pi., protoconule ; pr., protocone. 



