﻿Report 
  of 
  the 
  State 
  Geologist. 
  915 
  

  

  opposite 
  pairs 
  conjoin 
  midway 
  between 
  the 
  stems 
  accurately 
  and 
  

   at 
  an 
  ascending 
  angle." 
  

  

  All 
  dissepiments 
  are 
  formed 
  in 
  the 
  same 
  manner 
  as 
  the 
  

   bilateral 
  "simple 
  branches 
  of 
  Synocladia," 
  namely, 
  by 
  lateral 
  

   projections, 
  of 
  which 
  opposite 
  pairs 
  conjoin 
  midway 
  between 
  

   the 
  branches. 
  

  

  These 
  dissepiments 
  in 
  the 
  interior 
  are 
  always 
  more 
  or 
  less 
  

   celluliferous, 
  frequently 
  entirely 
  so. 
  

  

  Frequently 
  in 
  Polypora 
  the 
  dissepiments 
  have 
  several 
  cell 
  

   apertures 
  on 
  the 
  surface, 
  as 
  shown 
  in 
  a 
  previous 
  portion 
  of 
  this 
  

   paper, 
  and 
  much 
  more 
  emphatically 
  by 
  Mr. 
  Prout 
  in 
  Trans- 
  

   actions 
  of 
  the 
  St. 
  Louis 
  Academy 
  of 
  Science 
  and 
  by 
  Waagen 
  

   (Paleontologia 
  Indica; 
  Salt-Kange 
  Fossils, 
  Yol. 
  I, 
  pis. 
  xc, 
  xci), 
  

   and 
  uniformly 
  the 
  dissepiments 
  of 
  Phyllopora 
  have 
  cell 
  apertures 
  

   on 
  the 
  surface. 
  

  

  The 
  lateral 
  branches 
  of 
  Synocladia 
  are 
  formed 
  in 
  precisely 
  

   the 
  same 
  manner 
  as 
  the 
  dissepiments 
  of 
  the 
  other 
  forms 
  of 
  the 
  

   family 
  Fenestellidae, 
  and 
  I 
  can 
  see 
  no 
  valid 
  reason 
  for 
  consider- 
  

   ing 
  them 
  as 
  radically 
  different, 
  and 
  on 
  that 
  account 
  to 
  place 
  this 
  

   form 
  in 
  another 
  family 
  as 
  has 
  been 
  done 
  by 
  some 
  writers 
  ; 
  in 
  

   fact, 
  Dr. 
  King 
  himself, 
  although 
  in 
  his 
  generic 
  description 
  

   speaking 
  of 
  them 
  as 
  bilateral 
  branches, 
  in 
  his 
  description 
  of 
  

   S. 
  virgulacea, 
  the 
  type 
  species, 
  speaks 
  of 
  them 
  as 
  branches 
  or 
  

   connecting 
  processes. 
  

  

  Synocladia 
  differs 
  from 
  Polypora, 
  which 
  it 
  most 
  closely 
  resem- 
  

   bles, 
  in 
  the 
  angular 
  or 
  arcuate 
  character 
  of 
  the 
  dissepiment^ 
  

   and 
  in 
  their 
  pronounced 
  celluliferous 
  character 
  with 
  cell 
  aper- 
  

   tures 
  on 
  the 
  surface. 
  It 
  differs 
  from 
  Septopora 
  in 
  precisely 
  the 
  

   same 
  manner 
  that 
  Polypora 
  differs 
  from 
  Fenestella, 
  in 
  the 
  fact 
  

   that 
  there 
  are 
  more 
  than 
  two 
  ranges 
  of 
  cell 
  apertures 
  on 
  the 
  

   branches. 
  

  

  SEPTOPORA, 
  Prout. 
  

  

  (Trans. 
  Acad. 
  St. 
  Louis, 
  1858, 
  p. 
  448, 
  pi. 
  iv, 
  figs. 
  1, 
  2b 
  and 
  2c.) 
  

  

  Generic 
  description. 
  — 
  " 
  Bryozoum 
  a 
  fan-like 
  expansion, 
  radiating 
  

   from 
  a 
  center, 
  branching 
  and 
  occasionally 
  anastomosing, 
  having 
  

   two 
  lines 
  of 
  pores, 
  one 
  on 
  each 
  side 
  of 
  a 
  tuberculated 
  conduit, 
  

   Dissepiments 
  forming 
  arches 
  more 
  or 
  less 
  angular, 
  dividing 
  the 
  

   bryozoum 
  into 
  quadrangular, 
  round, 
  semi-lunar 
  or 
  rhomboidal 
  

   fenestrules 
  ; 
  each 
  dissepiment 
  supporting 
  from 
  one 
  to 
  four 
  irreg- 
  

  

  