﻿Plate 
  20 
  

  

  Page 
  

  

  Fig. 
  1. 
  Tholopora 
  virgulosa 
  Gregory, 
  L909 
  63 
  

  

  Zoarium, 
  X12, 
  formed 
  of 
  four 
  superposed 
  subcolonies. 
  

   Lower 
  Cretaceous 
  (Aptian) 
  : 
  Faringdon, 
  England. 
  

   Fig. 
  2-5. 
  Radiopora 
  tuberculata 
  D'Orbigny, 
  1849 
  03 
  

  

  2. 
  Zoarium, 
  nai 
  ural 
  size. 
  

  

  3. 
  Two 
  subcolonies, 
  X12, 
  showing 
  the 
  large 
  diameter 
  of 
  the 
  

  

  tubes. 
  

  

  4. 
  A 
  portion 
  of 
  the 
  surface, 
  X25. 
  

  

  5. 
  Base 
  of 
  a 
  zoarium, 
  X12, 
  showing 
  the 
  fan-shaped 
  

  

  arrangement 
  of 
  the 
  tubes. 
  

   Lower 
  Cretaceous 
  (Aptian): 
  Faringdon, 
  England. 
  

  

  Figs. 
  6-8. 
  Heteropora 
  nummular 
  ia, 
  new 
  species 
  13 
  

  

  6. 
  Zoarium, 
  natural 
  size. 
  

   7, 
  S. 
  Surface, 
  <12 
  and 
  <25. 
  

  

  Lower 
  Cretaceous 
  (Aptian): 
  Faringdon, 
  England. 
  

  

  Figs. 
  9-11. 
  Multicrescis 
  parvipora, 
  new 
  species 
  1-4 
  

  

  9. 
  Two 
  zoaria, 
  natural 
  size. 
  

   10, 
  11. 
  Portion 
  of 
  the 
  zoarial 
  surface, 
  X12 
  and 
  X25, 
  showing 
  

   the 
  small 
  irregular 
  oval 
  visors. 
  

   Lower 
  Cretaceous 
  (Valangian) 
  : 
  Sainte-Croix, 
  Switzer- 
  

   land. 
  

  

  Figs. 
  12-15. 
  Multicrescis 
  landrioti 
  Michelin, 
  1841 
  15 
  

  

  12, 
  13. 
  Top 
  and 
  basal 
  view 
  of 
  a 
  large 
  zoarium, 
  natural 
  

  

  size. 
  

   14, 
  15. 
  Zoarial 
  surface, 
  X 
  12 
  and 
  X25. 
  

  

  Lower 
  Cretaceous 
  (Valangian): 
  Sainte-Croix, 
  

   Switzerland. 
  

  

  113 
  

  

  