﻿l66. 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  pores) 
  which 
  give 
  the 
  entire 
  surface 
  an 
  asperato-granular 
  

   appearance. 
  

  

  Found 
  in 
  the 
  Rochester 
  shale 
  at 
  Lockport 
  (Hall), 
  and 
  probably 
  

   also 
  at 
  Niagara. 
  

  

  Genus 
  bythopora 
  Miller 
  & 
  Dyer 
  

  

  [Ety. 
  : 
  ^udo^, 
  depth; 
  -opo^, 
  pore] 
  

  

  (1878. 
  Contrih. 
  to 
  paleontology 
  no. 
  2, 
  p. 
  6) 
  

  

  Zoarium 
  usually 
  with 
  slender 
  branches, 
  sometimes 
  

   of 
  considerable 
  size; 
  diaphragms 
  obsolete; 
  apertures 
  

   obHque, 
  narrowing 
  above; 
  interspaces 
  canaliculate; 
  

   mesopores 
  few; 
  acanthopores 
  strong, 
  rarely 
  more 
  than 
  

   one 
  to 
  each 
  zoarium, 
  sometimes 
  wanting. 
  

  

  Bythopora 
  spinulosa 
  (Hall) 
  (Fig. 
  64). 
  Trematopora 
  

   spinidosa 
  Hall 
  (Pal. 
  N. 
  Y. 
  2:155, 
  pl- 
  4oA) 
  

  

  Distinguishing 
  characters. 
  Oval 
  apertures; 
  cylindri- 
  

   cal 
  branches; 
  strong 
  spines 
  (acanthopores) 
  arranged 
  at 
  

   nearly 
  regular 
  intervals. 
  

  

  Found 
  in 
  the 
  Rochester 
  shale 
  at 
  Lockport. 
  (Hall) 
  

  

  Fig. 
  64. 
  Bytho- 
  ^ 
  

  

  Sfarged^^''''^'''^ 
  Probably 
  occurs 
  also 
  at 
  Niagara. 
  

   Genus 
  trematopora 
  Hall 
  

   [Ety.: 
  TpTj/ma, 
  foramen; 
  T.6po<i, 
  pore] 
  

   (1852. 
  Pal 
  A^. 
  F. 
  2:149) 
  

  

  Zoarium 
  ramose; 
  surface 
  smooth 
  or 
  with 
  monticules; 
  zooecia 
  thin- 
  

   walled, 
  the 
  contact 
  lines 
  of 
  walls 
  of 
  adjoining 
  zooecia 
  distinct; 
  dia- 
  

   phragms 
  few, 
  in 
  the 
  proximal 
  ends 
  of 
  the 
  zooecia; 
  apertures 
  circular 
  

   or 
  oval, 
  with 
  a 
  more 
  or 
  less 
  well 
  marked 
  peristome; 
  interspaces 
  solid; 
  

   mesopores 
  irregularly 
  angular, 
  often 
  

   obscurely 
  moniliform, 
  with 
  diaphragms 
  . 
  ^-^ 
  ^/ 
  -^ 
  

   at 
  the 
  constricted 
  parts; 
  acanthopores 
  \« 
  '^^^ 
  f''^ 
  

   of 
  medium 
  or 
  small 
  size 
  usually 
  present. 
  ^ 
  , 
  (^r 
  P^ 
  

  

  Trematopora 
  tuberculosa 
  Hall 
  (Fig. 
  h-^ 
  ^' 
  

  

  65) 
  (1852. 
  Pal. 
  N. 
  Y. 
  2:149, 
  pi. 
  40A, 
  t.^ 
  ^^i-b-^ 
  

  

  fig. 
  la-g) 
  [^ 
  

  

  Distinguishing 
  characters. 
  Irregularly 
  

  

  Fig. 
  63 
  Trematopora 
  tuberculosa 
  with 
  

  

  ramose 
  and 
  stout 
  branches; 
  tuberculous 
  ^i^iargemeut 
  of 
  .surface 
  

   monticules; 
  tubular 
  cells 
  with 
  oval 
  apertures 
  and 
  thin 
  elevated 
  cali- 
  

   cle 
  or 
  margin 
  which 
  is 
  spinulose 
  (bearing 
  acanthopores); 
  inter- 
  

   apertural 
  spaces 
  solid, 
  but 
  septate 
  bslov/. 
  

  

  