﻿PLATE 
  XL 
  

  

  Trematopora 
  echixata 
  Hall. 
  

  

  Page 
  112. 
  

  

  Figs. 
  1, 
  2. 
  A 
  small 
  branch, 
  natural 
  size, 
  and 
  an 
  enlargement 
  of 
  the 
  bifurcation, 
  

   showing 
  the 
  character 
  of 
  the 
  cells. 
  

  

  Fig. 
  3. 
  An 
  enlargement 
  from 
  another 
  individual 
  where 
  the 
  cells 
  are 
  not 
  so 
  elon- 
  

   gate 
  as 
  in 
  the 
  preceding 
  one. 
  This 
  one 
  and 
  fig. 
  2 
  are 
  enlarged 
  eight 
  

   diameters. 
  

  

  Fig. 
  4. 
  An 
  enlargement 
  to 
  twelve 
  diameters 
  from 
  a 
  specimen 
  preserving, 
  in 
  great 
  

   perfection, 
  the 
  spines 
  at 
  the 
  cell-angles. 
  

  

  Fig. 
  5. 
  A 
  still 
  further 
  enlargement 
  of 
  the 
  walls 
  of 
  a 
  cell. 
  

  

  Trematopora 
  granxlifera 
  Hall. 
  

  

  Page 
  112. 
  

  

  Fig. 
  6. 
  An 
  enlargement 
  of 
  a 
  bifurcating 
  branch, 
  to 
  two 
  diameters. 
  

   Fig. 
  7. 
  A 
  still 
  further 
  enlargement 
  from 
  the 
  above 
  specimen, 
  to 
  show 
  the 
  arrange- 
  

   ment 
  of 
  cells 
  and 
  the 
  granulations 
  on 
  the 
  intercellular 
  spaces. 
  

  

  Trematopora 
  mustuta 
  Hall. 
  

  

  Page 
  113. 
  

  

  Fig. 
  8. 
  An 
  enlargement 
  to 
  about 
  twelve 
  diameters, 
  of 
  a 
  small 
  branch 
  of 
  this 
  

   species, 
  showing 
  the 
  arrangement 
  of 
  cells. 
  

  

  Trematopora 
  yariolata 
  Hall. 
  

  

  Page 
  113. 
  

  

  Fi'g. 
  9. 
  A 
  branch 
  of 
  the 
  species, 
  natural 
  size. 
  

  

  Fig. 
  10. 
  An 
  enlargement 
  from 
  a 
  part 
  of 
  the 
  same, 
  showing 
  the 
  scattered 
  pores. 
  

  

  Trematopora 
  spiculata 
  n. 
  sp. 
  

  

  Page. 
  114. 
  

  

  Fig. 
  11. 
  A 
  specimen 
  of 
  the 
  natural 
  size, 
  showing 
  the 
  mode 
  of 
  growth. 
  

   Fig 
  12. 
  An 
  enlargement 
  from 
  the 
  central 
  portion 
  of 
  the 
  specimen, 
  showing 
  the 
  

   character 
  of 
  the 
  surface 
  and 
  the 
  minute 
  spinules 
  at 
  the 
  angles 
  of 
  

  

  the 
  cells. 
  

  

  Stictopora 
  similis 
  Hall. 
  

  

  Page 
  122. 
  

  

  Figs. 
  13, 
  14. 
  A 
  small 
  bifurcating 
  fragment 
  with 
  oval 
  cellules, 
  natural 
  size 
  and 
  

  

  enlarged. 
  

   Figs. 
  15, 
  16. 
  Similar 
  views 
  of 
  another 
  individual 
  of 
  greater 
  width, 
  showing 
  more 
  

   crowded 
  cellules. 
  

  

  