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  Page 
  

   Figs. 
  1—4. 
  Spinopora 
  mitra 
  Goldfuss, 
  1827--- 
  3 
  \ 
  

  

  1, 
  2. 
  Colony, 
  natural 
  size, 
  and 
  the 
  same 
  enlarged. 
  

  

  3. 
  Longitudinal 
  section, 
  • 
  9, 
  showing 
  the 
  tubes 
  (o) 
  with 
  

   numerous 
  diaphragms 
  ; 
  and 
  the 
  solidified 
  wide 
  1 
  ubes 
  

   (s), 
  forming 
  the 
  spinous 
  tuberosities 
  of 
  the 
  surface. 
  

   1. 
  Tangential 
  section, 
  X2(i, 
  showing 
  the 
  irregular 
  spines 
  

   which 
  line 
  the 
  interior 
  of 
  1 
  he 
  tubes. 
  

   (1-4, 
  after 
  Hennig, 
  1894.) 
  

   Figs. 
  5-S. 
  Neuroporella 
  ignabergensis 
  Bennig, 
  1894 
  34 
  

  

  5. 
  <i. 
  Colony, 
  natural 
  size, 
  and 
  the 
  surface 
  enlarged, 
  show- 
  

   ing 
  the 
  nervures 
  and 
  the 
  centers 
  of 
  convergence. 
  

  

  7. 
  Meridian 
  section, 
  showing 
  the 
  structure 
  of 
  the 
  tubes, 
  

  

  with 
  numerous 
  diaphragms, 
  and 
  of 
  the 
  solidified 
  

   tube 
  (s), 
  corresponding; 
  to 
  the 
  nervures. 
  

  

  8. 
  Tangential 
  section 
  through 
  a 
  portion 
  with 
  nervures. 
  

  

  (5-8, 
  after 
  Hennig, 
  1S04.) 
  

   Figs. 
  9-19. 
  Neuropora 
  conuligera 
  Hennig, 
  1893 
  32 
  

  

  (1-12. 
  Lateral 
  view 
  of 
  four 
  colonies, 
  natural 
  size. 
  

  

  13. 
  Superior 
  view 
  of 
  a 
  lobe, 
  X12, 
  showing 
  the 
  nervures 
  

  

  and 
  their 
  center 
  of 
  convergence, 
  a. 
  

  

  14. 
  Longitudinal 
  section, 
  X4. 
  

  

  15. 
  Portion 
  of 
  a 
  longitudinal 
  section, 
  X25, 
  showing 
  

  

  the 
  reciprocal 
  arrangement 
  of 
  the 
  tubes, 
  with 
  dia- 
  

   phragms 
  and 
  their 
  thickened 
  vesicular 
  walls 
  (p) 
  . 
  

  

  16. 
  Portion 
  of 
  a 
  longitudinal 
  section, 
  X9, 
  showing 
  

  

  false 
  zonal 
  lines 
  and 
  the 
  structure 
  of 
  the 
  zooecial 
  

   walls. 
  

  

  17. 
  Portion 
  of 
  a 
  transverse 
  section, 
  X18. 
  The 
  central 
  

  

  portion 
  a 
  is 
  formed 
  of 
  ascending 
  bundles 
  of 
  

   tubes; 
  the 
  peripheral 
  portion 
  /; 
  shows 
  the 
  re- 
  

   curved 
  part 
  of 
  the 
  tubes, 
  with 
  their 
  usual 
  

   structure. 
  

  

  18. 
  Central 
  part 
  of 
  a 
  transverse 
  section, 
  X75, 
  showing 
  

  

  the 
  polygonal 
  zooecia 
  and 
  the 
  walls 
  (p) 
  of 
  pari- 
  

   etal 
  vesicles. 
  

  

  19. 
  Tangential 
  section, 
  Is, 
  exhibiting 
  the 
  solidified 
  

  

  tubes 
  a, 
  s, 
  forming 
  the 
  nervures. 
  

   (9-19, 
  after 
  Hennig, 
  1S93.) 
  

  

  Fig. 
  20. 
  Neuropora 
  micropora, 
  new 
  species 
  33 
  

  

  Longitudinal 
  section, 
  X50, 
  showing 
  the 
  microscopic 
  struc- 
  

   ture 
  of 
  the 
  walls. 
  

   Lower 
  Cretaceous 
  (Aptian) 
  : 
  Faringdon, 
  England. 
  

  

  123 
  

  

  