﻿I76 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  PLATE 
  3 
  

  

  A 
  series 
  of 
  drawings 
  to 
  illustrate 
  the 
  commensalism 
  of 
  Pleuro- 
  

   dietyum 
  and 
  the 
  worm 
  Hicetes 
  innexus 
  

   i 
  , 
  2 
  Top 
  and 
  side 
  views 
  of 
  a 
  corallum 
  of 
  Pleurodictyum 
  

   styloporum 
  Eaton 
  from 
  the 
  Hamilton 
  shales 
  of 
  New 
  

   York. 
  The 
  worm 
  tubes 
  are 
  clearly 
  seen 
  at 
  x-x 
  on 
  the 
  sur- 
  

   face 
  of 
  the 
  colony. 
  

  

  3 
  Vertical 
  section 
  of 
  a 
  corallum 
  showing 
  sections 
  of 
  the 
  con- 
  

  

  voluted 
  tube 
  near 
  its 
  base 
  

  

  4 
  The 
  under 
  side 
  of 
  a 
  corallum 
  with 
  impression 
  of 
  the 
  gastropod 
  

  

  Loxonema 
  hamiltoniae 
  to 
  which 
  it 
  is 
  attached 
  

  

  5 
  An 
  etching 
  which 
  has 
  removed 
  the 
  base 
  of 
  the 
  coral 
  and 
  shows 
  

  

  the 
  initial 
  convolutions 
  of 
  the 
  worm 
  tube 
  

  

  6 
  The 
  form 
  of 
  the 
  entire 
  tube, 
  drawn 
  from 
  an 
  actual 
  specimen 
  

  

  7 
  The 
  basal 
  surface 
  of 
  Pleurodictyum 
  problem- 
  

  

  atic 
  u 
  m 
  attached 
  to 
  the 
  brachiopod 
  Chonetes 
  

   sarcinulatus 
  Goldfuss. 
  This 
  specimen 
  is 
  from 
  the 
  

   Coblentzian 
  at 
  Stadtfeld. 
  

  

  8 
  An 
  etching 
  of 
  the 
  basal 
  part 
  of 
  P. 
  styloporum 
  showing 
  

  

  the 
  chief 
  worm 
  and 
  a 
  wormlike 
  extension 
  which 
  appears 
  to 
  

   arise 
  from 
  the 
  base 
  of 
  a 
  polypite 
  and 
  turn 
  into 
  an 
  upward 
  

   course 
  between 
  the 
  cells 
  

  

  