﻿172 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Genus 
  polypora 
  McCoy 
  

  

  [Ety.: 
  TToXu?, 
  many; 
  tto/^o?, 
  pore] 
  

  

  (1845. 
  Synopsis 
  Carbon, 
  foss. 
  Ireland, 
  p. 
  206) 
  

  

  Zoarium 
  as 
  in 
  Fenestella, 
  but 
  with 
  from 
  two 
  to 
  eight 
  rows 
  

   of 
  zooecia 
  on 
  a 
  branch, 
  and 
  without 
  median 
  keel, 
  but 
  sometimes 
  

   with 
  a 
  row 
  of 
  strong 
  nodes 
  or 
  tubercles. 
  

  

  Polypora 
  incepta 
  Hall 
  (Fig. 
  73) 
  (1852. 
  Pal. 
  N. 
  Y. 
  2:167, 
  pl- 
  

   40D, 
  fig. 
  5a-f) 
  

  

  Distinguishing 
  characters. 
  

   Funnel-shaped, 
  but 
  generally 
  

   compressed 
  form; 
  branches 
  

   dividing 
  somewhat 
  regularly, 
  

   sometimes 
  anastomosing; 
  dis- 
  

   sepiments 
  at 
  regular 
  intervals, 
  

   slender, 
  scarcely 
  thickened 
  at 
  

   their 
  junction 
  with 
  branches; 
  

   fenestrules 
  oblong, 
  quadran- 
  

   gular, 
  rarely 
  oval; 
  non-celluli- 
  

   ferous 
  face 
  longitudinally 
  

   striate; 
  three 
  or 
  four 
  rows 
  of 
  

   cell 
  apertures, 
  oval 
  and 
  alter- 
  

   nating; 
  dissepiments 
  thinner 
  

   on 
  celluliferous 
  than 
  on 
  non- 
  

   celluliferous 
  face; 
  sometimes 
  

   expanding 
  at 
  the 
  junction 
  

   with 
  the 
  .branches; 
  non-cel- 
  

   luliferous 
  face 
  indistinguish- 
  

  

  Fig. 
  73 
  Polypora 
  incepta 
  with 
  non-celluliferous 
  and 
  , 
  , 
  ^ 
  -r- 
  ^11 
  

  

  celluliferous 
  faces 
  enlarged 
  able 
  from 
  J:^ 
  cnCSteila. 
  

  

  Found 
  abundantly 
  in 
  the 
  Bryozoa 
  beds 
  of 
  the 
  Rochester 
  shale 
  at 
  

   Niagara, 
  and 
  the 
  talus 
  of 
  the 
  cHfif 
  above 
  Lewiston 
  hights. 
  Also 
  in 
  

   the 
  shale 
  at 
  Lockport 
  (Hall). 
  

  

  Genus 
  helopora 
  Hall 
  

  

  [Ety.: 
  rj^o?, 
  nail; 
  Trdpo?, 
  pore] 
  

  

  (1852. 
  Pal. 
  N. 
  Y. 
  2:44) 
  

  

  Zoarium 
  bushy, 
  dichotomously 
  branching, 
  the 
  whole 
  consisting 
  

   of 
  numerous 
  slender, 
  equal 
  segments, 
  united 
  by 
  terminal 
  articula- 
  

  

  