TEETH OF THE MESOZOIC MAMMALS 



29 



FIG. 22. Pcraspalax. Upper Jurassic, 

 England. Internal view, enlarged. 



I \(t 



^ .(/ 





C. 23. Amlloth<:rium. Upper Jurassic, 

 England. Internal view, enlarged. 



Flo. '24. Achyrodon. Upper Jurassic, 

 England. Internal view, enlarged. 



FIG. 25. Phn.<nil:xt<s. Upper Jurassic, 

 England. Internal view, enlarged. 



FIG. 26. Po.urod.on. Upper Jurassic, America. Internal view. xf. After Marsh. 



FIG. 27. Pc,-ani>'.< (Leptocladus). Upper 

 Jurassic, England. Internal view, enlarged. 



FIG. 2S. Sti/lodoii. Upper Jurassic, England. 

 External view, enlarged. 



FIG. 29. Stylodon (Stylacodori). Upper Jurassic, America. External view. Xy. After Marsh. 



FIG. 30. Laodon. Upper Jurassic, America. Internal view. X T . After Marsh. 



Jurassic Pantotheria or Trituberculata. Lower Jaws. AmblotheriidaB or Stj'la- 

 codouticlae and Paurodontidae. For scale of Figs. 22, 25, 27, 28, see Fig. 4. 

 Fi gs. 26, 29 are three times natural size. 



