﻿Plate 
  10 
  

  

  Page 
  

   Figs. 
  1—4. 
  Ceriocava 
  tenuirama, 
  new 
  species 
  70 
  

  

  1. 
  Fragments 
  of 
  zoarium, 
  natural 
  size. 
  

  

  2. 
  Specimen, 
  X12, 
  showing 
  the 
  habitual 
  aspect. 
  

  

  3,4. 
  Example, 
  X12 
  and 
  X25, 
  showing 
  tubes 
  with 
  facettes 
  

   and 
  an 
  orbicular 
  orifice. 
  

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

   land. 
  

  

  Figs. 
  5-12. 
  Diplocava 
  incondita, 
  new 
  species 
  71 
  

  

  .5. 
  Fragments, 
  natural 
  size. 
  

  

  ('). 
  Specimen, 
  X6, 
  showing 
  normal 
  aspect. 
  The 
  groups 
  of 
  

   large 
  tubes 
  are 
  surrounded 
  by 
  small 
  tubes 
  with 
  

   facettes. 
  

   7,8. 
  Surface 
  of 
  arborescent 
  zoarial 
  fragment, 
  • 
  12 
  and 
  X25, 
  

   with 
  monomorphic 
  tubes. 
  

   9,10. 
  Bilamellar 
  zoarial 
  fragment, 
  12 
  and 
  X25, 
  showing 
  

   tubes 
  with 
  facettes. 
  

  

  11. 
  Ovicelled 
  lamellar 
  zoarium, 
  X12. 
  The 
  parts 
  with 
  

  

  large 
  orifice 
  are 
  little 
  visible. 
  The 
  ovicell 
  is 
  star- 
  

   shaped 
  with 
  four 
  branches. 
  

  

  12. 
  Group 
  of 
  large 
  zooecia 
  without 
  facettes, 
  25. 
  

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

   land. 
  

  

  103 
  

  

  