﻿PLATE 
  VIII— 
  (Continued). 
  

  

  Fig. 
  11. 
  A 
  specimen 
  of 
  Platyostoma 
  having 
  the 
  surface 
  covered 
  by 
  the 
  substance 
  

   of 
  the 
  bryozoan 
  . 
  

  

  Fig. 
  12. 
  An 
  oblique 
  lateral 
  view 
  of 
  a 
  portion 
  of 
  the 
  surface, 
  showing 
  the 
  asperi- 
  

   ties 
  at 
  the 
  angles 
  of 
  the 
  cells. 
  Enlarged 
  to 
  six 
  diameters. 
  

  

  Fig. 
  13. 
  An 
  enlarged 
  view 
  of 
  the 
  same, 
  looking 
  directly 
  upon 
  the 
  cell-apertures. 
  

  

  Paleschaka 
  ? 
  (Ch^etetbs 
  ?) 
  sph^bicw 
  Hall. 
  

  

  Page 
  121. 
  

  

  Fig. 
  14. 
  View 
  of 
  one 
  side 
  of 
  the 
  colony, 
  enlarged 
  to 
  two 
  diameters, 
  showing 
  the 
  

   arrangement 
  of 
  the 
  cells. 
  

  

  Fig. 
  15. 
  A 
  section 
  through 
  the 
  center 
  of 
  the 
  specimen, 
  enlarged 
  to 
  the 
  same 
  de- 
  

   gree 
  as 
  fig. 
  14. 
  The 
  dark 
  line 
  at 
  the 
  base 
  of 
  the 
  cells 
  represents 
  

   the 
  solid 
  substance 
  of 
  the 
  cell 
  floor, 
  the 
  inner 
  space 
  being 
  filled 
  with 
  

   inorganic 
  calcareous 
  clay 
  . 
  

  

  

  

  