﻿916 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  ular 
  lines 
  of 
  cell 
  pores 
  ; 
  reverse 
  smooth 
  when 
  worn 
  ; 
  more 
  or 
  less 
  

   tubercled 
  when 
  perfect. 
  

  

  I 
  have 
  established 
  a 
  genus 
  on 
  the 
  character 
  of 
  the 
  dissepi- 
  

   ments, 
  which 
  are 
  more 
  celluliferous 
  than 
  the 
  longitudinal 
  rays. 
  

  

  Though 
  in 
  its 
  generic 
  features 
  it 
  resembles 
  Fenestella, 
  it 
  differs 
  

   in 
  a^marked 
  degree 
  by 
  its 
  celluliferous 
  dissepiments." 
  

  

  This 
  genus 
  differs 
  from 
  Synocladia 
  in 
  having 
  only 
  two 
  rows 
  of 
  

   cell 
  apertures 
  separated 
  by 
  a 
  carina. 
  

  

  HELICOPORA, 
  Claypole. 
  

  

  In 
  February, 
  1883, 
  in 
  the 
  Quarterly 
  Journal 
  of 
  the 
  Geological 
  

   Society, 
  p. 
  32, 
  Prof. 
  E. 
  W. 
  Claypole 
  proposed 
  the 
  new 
  genus 
  

   Helicopora, 
  which 
  he 
  described 
  as 
  follows: 
  

  

  " 
  Polyzoary 
  expanded, 
  fenestrate 
  and 
  spiral, 
  formed 
  of 
  slender 
  

   bifurcating 
  rays, 
  poriferous 
  on 
  one 
  face, 
  connected 
  by 
  non-porif- 
  

   erous 
  bars, 
  forming 
  an 
  open 
  network 
  ; 
  cells 
  arranged 
  in 
  two 
  

   rows 
  along 
  the 
  rays, 
  one 
  row 
  on 
  each 
  side 
  of 
  a 
  median 
  keel 
  ; 
  

   axis 
  none, 
  or 
  consisting 
  only 
  of 
  the 
  thickened 
  inner 
  border 
  of 
  

   the 
  polyzoary, 
  not 
  straight 
  but 
  forming 
  a 
  spiral, 
  rounded, 
  non- 
  

   ponferous 
  or 
  slightly 
  poriferous 
  inner 
  margin." 
  

  

  