﻿Plate 
  1 
  1 
  

  

  Page 
  

  

  Figs. 
  1 
  11. 
  Siphodictyum 
  irregulare, 
  new 
  species 
  89 
  

  

  1. 
  Zoarial 
  fragments, 
  natural 
  size 
  

  

  '_'. 
  Noncelhilar 
  posterior 
  face 
  of 
  zoarium, 
  • 
  12. 
  The 
  

   vacuoles 
  are 
  placed 
  at 
  the 
  bottom 
  of 
  the 
  oblique 
  

   sulci. 
  

   3. 
  Surface, 
  ■ 
  25, 
  showing 
  the 
  arrangemenl 
  of 
  the 
  frontal 
  

   vacuoles 
  between 
  the 
  peristomes. 
  

   1. 
  .">. 
  The 
  two 
  faces 
  of 
  the 
  same 
  zoarium, 
  <12. 
  The 
  peri- 
  

   stomes 
  are 
  arranged 
  in 
  quincunx. 
  

   6. 
  Celluliferous 
  (anterior) 
  face, 
  12. 
  The 
  peristomes 
  

   are 
  arranged 
  in 
  regular 
  or 
  interrupted 
  transverse 
  

   rows. 
  

   7. 
  8. 
  Two 
  zoaria, 
  X12. 
  The 
  celluliferous 
  spaces 
  alternate 
  

   wil 
  li 
  the 
  noncelhilar 
  spaces. 
  

   9," 
  10. 
  Two 
  branches, 
  X12. 
  At 
  the 
  extremity 
  of 
  the 
  branches 
  

   the 
  peristomes 
  are 
  arranged 
  entirely 
  around 
  the 
  

   colony. 
  

   11. 
  Same 
  specimen 
  as 
  Figure 
  9, 
  <25. 
  

  

  Lower 
  Cretaceous 
  (Aptian) 
  : 
  Faringdon, 
  England. 
  

  

  Fios. 
  12, 
  13. 
  Lobosoecia 
  semiclausa 
  Michelin, 
  1845 
  63 
  

  

  12, 
  13. 
  Branch, 
  12 
  and 
  <25. 
  The 
  facettes 
  are 
  elon- 
  

   gated. 
  

   Lower 
  Cretaceous 
  (Aptian): 
  Faringdon, 
  Eng- 
  

   land. 
  

   Figs. 
  14-21. 
  Siphodictyum 
  gracile 
  Lonsdale, 
  1x49 
  87 
  

  

  14. 
  Two 
  branches 
  natural 
  size. 
  

  

  15. 
  Branch, 
  X25. 
  The 
  peristomes 
  are 
  incomplete 
  or 
  

  

  interrupted 
  transverse 
  lines. 
  There 
  are 
  4 
  to 
  6 
  

   vacuoles 
  to 
  a 
  tube. 
  

  

  Hi. 
  Lateral 
  view 
  of 
  same 
  specimen, 
  > 
  25. 
  

  

  17. 
  Dorsal 
  view. 
  25, 
  with 
  vacuoles 
  placed 
  at 
  the 
  bot- 
  

   tom 
  of 
  the 
  sulci. 
  

  

  is. 
  Surface, 
  X25, 
  with 
  the 
  peristomes 
  placed 
  in 
  quin- 
  

   cunx. 
  There 
  are 
  4 
  vacuoles 
  to 
  a 
  tube. 
  

  

  19. 
  Dorsal 
  face, 
  X25. 
  The 
  vacuoles 
  are 
  at 
  the 
  bottom 
  

  

  of 
  the 
  very 
  oblique 
  sulci. 
  

  

  20. 
  Celluliferous 
  face 
  of 
  a 
  specimen, 
  > 
  12. 
  in 
  which 
  the 
  

  

  orifices 
  are 
  arranged 
  almost 
  around 
  the 
  colony, 
  

   the 
  dorsal 
  face 
  being 
  very 
  small. 
  

  

  21. 
  Dorsal 
  side 
  of 
  the 
  same 
  specimen, 
  X12. 
  

  

  Lower 
  Cretaceous 
  (Aptian): 
  Faringdon, 
  England. 
  

  

  107 
  

  

  