﻿I 
  

  

  

  i 
  

  

  PLATE 
  XII 
  — 
  (Continued). 
  

  

  Fenestella 
  punctostriata 
  Hall 
  

  

  Page 
  125. 
  

  

  Fig. 
  15. 
  A 
  fragment 
  of 
  a 
  frond 
  of 
  this 
  species. 
  

  

  Fig. 
  16. 
  An 
  enlargement 
  of 
  a 
  portion 
  of 
  the 
  same, 
  showing 
  the 
  peculiar 
  striation 
  

   and 
  pitting 
  of 
  the 
  non-celluliferous 
  surface. 
  

  

  

  