﻿Plate 
  24 
  

  

  Figures 
  Dot 
  otherwise 
  noted 
  natural 
  size 
  

  

  Page 
  

   COELIOCRINUS 
  VENTR1C0SUS 
  (Hall) 
  67,86 
  

  

  Fig. 
  1. 
  The 
  type. 
  Anterior 
  view, 
  showing 
  the 
  inflated 
  sac 
  with 
  plates 
  

   tending 
  to 
  form 
  longitudinal 
  ridges, 
  and 
  the 
  structure 
  and 
  

   mode 
  of 
  bifurcation 
  of 
  the 
  arms. 
  

  

  2. 
  Posterior 
  view 
  of 
  another 
  complete 
  crown, 
  showing 
  anal 
  

  

  plates 
  leading 
  to 
  the 
  tube, 
  and 
  inflated 
  sac 
  rising 
  above 
  the 
  

   arms. 
  

  

  3. 
  Lateral 
  view 
  of 
  specimen 
  with 
  most 
  of 
  arms 
  removed, 
  exposing 
  

  

  the 
  general 
  form 
  and 
  proportions 
  of 
  the 
  balloon-shaped 
  sac. 
  

  

  4. 
  Proximal 
  view 
  of 
  detached 
  inflated 
  part 
  of 
  sac, 
  showing 
  the 
  

  

  narrow 
  neck 
  connecting 
  it 
  with 
  the 
  calyx. 
  (See 
  fig. 
  1. 
  pi. 
  25, 
  

   for 
  opposite 
  view.) 
  

   5, 
  6, 
  7. 
  Three 
  detached 
  inflated 
  distal 
  ends 
  of 
  sac, 
  showing 
  how 
  they 
  

   are 
  formed 
  by 
  the 
  bending 
  of 
  the 
  tube, 
  as 
  indicated 
  by 
  the 
  

   arrangement 
  of 
  plates 
  in 
  longitudinal 
  ridges. 
  

   8. 
  Isolated 
  distal 
  end 
  of 
  sac, 
  from 
  Lake 
  Valley, 
  New 
  Mexico. 
  

   Lower 
  Burlington 
  limestone; 
  all 
  except 
  figure 
  8 
  from 
  Bur- 
  

   lington, 
  Iowa. 
  

  

  COELIOCRINUS 
  DILATATUS 
  (Hall) 
  86 
  

  

  Figs. 
  9, 
  9a. 
  The 
  type. 
  Left 
  anterior 
  and 
  right 
  posterior 
  views 
  of 
  com- 
  

   plete 
  crown, 
  showing 
  relatively 
  large 
  size 
  of 
  the 
  sac 
  and 
  

   its 
  distal 
  plates. 
  

   10,10a. 
  Posterior 
  and 
  anterior 
  view 
  of 
  similar 
  crown, 
  showing 
  mode 
  

   of 
  bifurcation 
  of 
  arms. 
  

  

  11. 
  An 
  unusually 
  large 
  specimen; 
  posterior 
  view 
  showing 
  

  

  arrangement 
  of 
  anal 
  plates 
  at 
  hase 
  of 
  tube, 
  and 
  large 
  size 
  

   of 
  plates 
  forming 
  the 
  inflated 
  part. 
  

  

  12. 
  Specimen 
  showing 
  distal 
  part 
  of 
  sac 
  with 
  plates 
  tending 
  

  

  to 
  become 
  spiniferous. 
  

  

  13. 
  Isolated 
  distal 
  part 
  of 
  a 
  sac 
  from 
  Lake 
  Valley, 
  New 
  Mexico. 
  

  

  Lower 
  Burlington 
  limestone 
  ; 
  all 
  except 
  figure 
  13 
  from 
  Bur- 
  

   lington, 
  Iowa. 
  

  

  131 
  

  

  