﻿PLATE 
  IX. 
  

  

  Favosites 
  spinigerus 
  Hall. 
  

  

  Page 
  108. 
  

  

  Fig. 
  1. 
  The 
  upper 
  surface 
  of 
  a 
  specimen, 
  the 
  cells 
  of 
  which 
  are 
  smaller 
  than 
  

   those 
  of 
  the 
  specimen 
  represented 
  on 
  plate 
  4, 
  and 
  without 
  the 
  pro- 
  

   cesses 
  at 
  the 
  angles 
  of 
  the 
  cells. 
  

  

  Fig. 
  2. 
  An 
  enlargement 
  to 
  four 
  diameters 
  of 
  a 
  portion 
  of 
  the 
  surface. 
  

  

  Callopora 
  exsul 
  Hall. 
  

  

  Page 
  115. 
  

  

  Fig. 
  3. 
  The 
  upper 
  side 
  of 
  a 
  specimen 
  (natural 
  size) 
  . 
  

  

  Fio- 
  4. 
  An 
  enlargement 
  of 
  the 
  cell-apertures. 
  The 
  original 
  of 
  this 
  figure 
  is 
  a 
  

   specimen 
  of 
  . 
  Callopora 
  incrusting 
  and 
  partially 
  covering 
  a 
  

   Ceramopora, 
  and 
  the 
  form 
  of 
  the 
  cell-apertures 
  represents 
  the 
  

   latter 
  genus 
  while 
  the 
  denticulate 
  margins 
  are 
  of 
  Callopora. 
  

  

  Aulopora 
  precius 
  Hall. 
  

   Page 
  107. 
  

   Fig. 
  5. 
  A 
  colony 
  attached 
  to 
  the 
  surface 
  of 
  Meristina 
  nitida. 
  

   Fig*. 
  6. 
  Enlargement 
  from 
  the 
  preceding 
  specimen, 
  showing 
  the 
  form 
  and 
  charac- 
  

   ter 
  of 
  the 
  cells. 
  

  

  Ch^tetes 
  cokstmilis 
  Hall. 
  

  

  Page 
  110. 
  

   Figs. 
  7, 
  8. 
  A 
  specimen, 
  natural 
  size, 
  and 
  an 
  enlargement 
  to 
  five 
  diameters, 
  from 
  

  

  the 
  lower 
  bifurcation, 
  where 
  the 
  tubes 
  have 
  grown 
  so 
  as 
  to 
  leave 
  

  

  the 
  cell-walls 
  exposed. 
  

   Figs. 
  9, 
  10. 
  A 
  specimen, 
  natural 
  size, 
  and 
  an 
  enlargement 
  from 
  the 
  lower 
  end, 
  

  

  showing 
  the 
  solid 
  stem 
  with 
  columnar 
  structure, 
  and 
  angular 
  cell- 
  

   apertures. 
  

   Figs. 
  11. 
  12. 
  Another 
  individual, 
  and 
  an 
  enlargement 
  from 
  the 
  lower 
  bifurcation, 
  

  

  showing 
  the 
  young 
  cells 
  in 
  the 
  angles 
  of 
  the 
  larger 
  ones. 
  

   Figs. 
  13, 
  14. 
  Another 
  individual 
  and 
  an 
  enlargement 
  of 
  the 
  same, 
  where 
  the 
  

  

  cell-walls 
  are 
  flattened 
  on 
  the 
  surface, 
  as 
  from 
  wearing. 
  All 
  the 
  

  

  enlargements 
  are 
  to 
  five 
  diameters. 
  

  

  

  