﻿Fig. 
  9. 
  

  

  Fig. 
  9. 
  — 
  Upper 
  Devonian, 
  middle 
  part. 
  

   Fig. 
  10. 
  

  

  Fig. 
  10. 
  — 
  Early 
  Lower 
  Carboniferous 
  or 
  Mississippian. 
  

  

  