PLATE VIII 



Fig. 1. Didelphys valens, Lambe ; right upper molar, crown view ; four times the natural 

 size. Type. Page 22. 

 The same tooth, posterior aspect ; similarly enlarged. 

 The same tooth, anterior view ; similarly enlarged. 

 The same tooth, exterior view ; similarly enlarged. 

 ? Didelphys valens, Lambe ; lower molar, viewed from above ; enlarged four times. 

 Same tooth, inner aspect ; same enlargement. 

 Same tooth, posterior view ; same enlargement. 

 Poebrotherium wilsoni, Leidy ; part of a left mandibular ramus with last temporary 



molar in place; outer aspect. Page 30. 

 Crown view of the molar shown in figure 8 ; enlarged three times. 

 Leptomeryx speciosus, Lambe ; crown view of right upper molar ; three times natural 



size. Type. Page 3L 

 The same tooth similarly enlarged, outer aspect. 

 Leptomeryx speciosus, Lambe ; right lower molar, crown view ; three times the 



natural size. 

 The same tooth, outer q,spect ; three times natural size. 

 Leptomeryx speciosus, Lambe ; left posterior lower molar, crown view ; enlarged 



three times. 

 The same molar, inner aspect ; similarly enlarged. 

 Sciurus f saskatchewensis, Lambe ; left upper molar, crown view ; four times the 



natural size. Type. Page 65. 

 The same tooth, posterior aspect ; similarly enlarged. 



Ischyromys ti/pus, Leidy ; right second lower molar, crown view ; four times the 

 natural size. Page 66. 

 Fig. 19. Cylindrodon fontis, Douglass; portion of left mandibular ramus in which is 



preserved the first molar ; enlarged three times. Page 56. 

 Fig. 20. The same specimen, as seen from above ; four times the natural size. 

 Fig. 21. Pakeolagus haydeni, Leidy ; right upper first molar, crown view ; slightly over four 



times the natural size. Page 58. 

 Fig. 22. Palceolagus haydeni, Leidy ; left upper fourth premolar, posterior view ; slightly 



over four times the natural size. 

 Fig. 2-3. The same tooth, crown view ; similarly enlarged. 

 Fig. 24. Palceolagas haydeni, Leidy ; right lower molar, outer aspect ; four times the natural 



size. 

 Fig. 25. The same tooth, viewed trom above ; similarly enlarged. 



