﻿The 
  Faum 
  of 
  the 
  Niagara 
  Group. 
  119 
  

  

  CERAMOPORA 
  Hall. 
  

   Ceramopora 
  labecula. 
  

  

  Plate 
  8, 
  Figs. 
  1-3. 
  

  

  Ceramopora 
  (Berenicia?) 
  labecula 
  Hall. 
  Doc. 
  Edit. 
  28th 
  Rep. 
  St. 
  Mus. 
  Nat. 
  

  

  Hist. 
  Explanation 
  of 
  pi. 
  8, 
  figs. 
  1-3. 
  1876. 
  

   Compare 
  Ceramopora 
  imbrlcata 
  Hall,. 
  Pal. 
  N. 
  Y., 
  vol. 
  ii, 
  p. 
  169, 
  pl.40E. 
  figs. 
  

  

  la-li. 
  1852. 
  

  

  Bryozoum 
  growing 
  in 
  circular 
  or 
  subcircular 
  discoid 
  forms 
  

   upon 
  other 
  organic 
  bodies 
  ; 
  greatest 
  diameter 
  observed 
  

   about 
  seven 
  mm. 
  Cell-tubes 
  short, 
  cylindrical, 
  radiating 
  

   from 
  the 
  center 
  and 
  increasing 
  by 
  lateral 
  additions, 
  those 
  in 
  

   the 
  central 
  portion 
  being 
  nearly 
  vertical, 
  and 
  becoming 
  more 
  

   and 
  more 
  oblique 
  as 
  they 
  recede 
  from 
  this 
  point, 
  until 
  the 
  

   marginal 
  ones 
  are 
  nearly 
  parallel 
  with 
  the 
  epitheca 
  ; 
  arranged 
  

   in 
  alternating 
  and 
  imbricating 
  series. 
  Apertures 
  arched 
  or 
  

   somewhat 
  triangular, 
  .25 
  mm., 
  or 
  less, 
  in 
  diameter. 
  

  

  This 
  species 
  is 
  found 
  attached 
  to 
  the 
  bases 
  of 
  crinoids, 
  to 
  

   gasteropods, 
  and 
  other 
  fossils. 
  

  

  Ceramopora 
  confluens. 
  

  

  Plate 
  8, 
  Figs. 
  4, 
  5. 
  

  

  Ceramopora 
  conjiuens 
  Hall. 
  Doc. 
  Edit. 
  28th 
  Rep. 
  St. 
  Mus. 
  Nat. 
  Hist. 
  Explana- 
  

   tion 
  of 
  pi. 
  8, 
  figs. 
  4, 
  5. 
  1876. 
  

  

  Bryozoum, 
  consisting 
  of 
  lamellose 
  expansions 
  growing 
  upon 
  

   the 
  surface 
  of 
  other 
  organic 
  bodies, 
  and 
  attaining 
  a 
  thickness 
  

   of 
  from 
  .25 
  to 
  1 
  mm. 
  Cell-tubes 
  short 
  cylindrical, 
  closely 
  ar- 
  

   ranged 
  in 
  alternating 
  and 
  imbricating 
  order. 
  Surface 
  often 
  

   elevated 
  in 
  nodose 
  prominences 
  which 
  are 
  sometimes 
  destitute 
  

   of 
  cells. 
  Cell-apertures 
  arching 
  or 
  triangular, 
  about 
  four 
  in 
  

   the 
  space 
  of 
  one 
  millimetre. 
  

  

  This 
  species 
  occurs 
  in 
  large 
  expansions 
  growing 
  upon 
  shells 
  

   and 
  upon 
  the 
  calyces 
  of 
  crinoids. 
  The 
  surface 
  of 
  the 
  expansion 
  

   rises 
  into 
  low 
  rounded 
  nodes 
  and 
  irregular 
  undulating 
  ridges, 
  

   the 
  summits 
  of 
  which 
  are 
  sometimes 
  free 
  from 
  cellules, 
  while 
  

   in 
  many 
  examples 
  there 
  are 
  a 
  few 
  larger 
  cellules 
  marking 
  the 
  

   sides 
  of 
  the 
  elevation. 
  The 
  cell-apertures 
  are 
  usually 
  closely 
  

   arranged, 
  sometimes 
  more 
  distant, 
  and 
  when 
  entire, 
  have 
  the 
  

   typical 
  arching 
  form, 
  but 
  where 
  the 
  surface 
  is 
  worn, 
  they 
  are 
  

   round 
  or 
  broadly 
  oval. 
  

  

  