﻿EXPLANATION 
  OF 
  PLATES 
  

  

  Plate 
  1 
  

  

  Page 
  

   Figs. 
  1-4. 
  Mecynoecia 
  icaunensis 
  D'Orbigny, 
  1850 
  35 
  

  

  1. 
  Zoarial 
  fragments, 
  natural 
  size. 
  

  

  2. 
  Large 
  branch, 
  X12, 
  on 
  which 
  the 
  tubes 
  are 
  somewhat 
  

  

  visible. 
  

  

  3. 
  Young 
  bifurcated 
  branch, 
  X12. 
  

  

  4. 
  Young 
  slender 
  branch, 
  X12. 
  

  

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

   land. 
  

   Fig. 
  5. 
  Trigonoecia 
  semota, 
  new 
  species 
  37 
  

  

  5. 
  Zoarium 
  showing 
  two 
  ovicells, 
  X12. 
  The 
  surface 
  of 
  the 
  

  

  ovicells 
  is 
  wrinkled 
  and 
  the 
  oeciostome 
  is 
  small. 
  

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

   land. 
  

   Figs. 
  6-12. 
  Trigonoecia 
  haimeana 
  De 
  Loriol, 
  1863 
  39 
  

  

  6. 
  Large 
  zoarium, 
  natural 
  size, 
  of 
  many 
  incrusting 
  layers. 
  

   7, 
  8. 
  Surface 
  of 
  the 
  same 
  specimen, 
  X12 
  and 
  X25. 
  

  

  9. 
  Specimen, 
  X12 
  with 
  the 
  ovicell 
  incompletely 
  formed. 
  

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

   land. 
  

  

  10. 
  Portion 
  of 
  the 
  zoarial 
  surface, 
  X12, 
  showing 
  the 
  con- 
  

  

  centric 
  wrinkles. 
  

  

  11. 
  Portion 
  of 
  surface, 
  X25, 
  with 
  tubes 
  visible. 
  

  

  12. 
  Ovicelled 
  portion 
  of 
  the 
  surface, 
  X12. 
  

  

  Lower 
  Cretaceous 
  (Aptian) 
  : 
  Faringdon, 
  England. 
  

  

  94 
  

  

  