20 



part]}' owing to the fact that the geological reports were completed before 

 the pal?eontological one, and partly because there are certain radical dif- 

 erences in many points between the view expressed previously by various 

 authorities in the same field and my owns which have gradually developed 

 during the palaeontological study outlined above. 



Febiuary il, 1918. Prof. H. Yabe. 



Geological Institute, 

 Tohoku Imperial University, 

 Sendai, Japan. 



