﻿Plate 
  25 
  

  

  All 
  figures 
  natural 
  size 
  unless 
  otherwise 
  noted 
  

  

  Page 
  

   COELIOCRINUS 
  VENTRICOSUS 
  (Hall) 
  SB 
  

  

  Fig. 
  1. 
  Distal 
  view 
  of 
  inflated 
  ventral 
  sac, 
  same 
  specimen 
  shown 
  on 
  

   plate 
  24, 
  fig. 
  4 
  (slightly 
  enlarged). 
  

  

  C0E1I0CRINUS 
  SUBSPINOSUS 
  White 
  80 
  

  

  Fig. 
  2. 
  Lateral 
  view 
  of 
  a 
  maximum 
  crown, 
  with 
  spines 
  projecting 
  from 
  

   flattened 
  distal 
  end 
  of 
  sac 
  above 
  the 
  region 
  of 
  the 
  arms. 
  

   3. 
  Posterior 
  view 
  of 
  smaller 
  specimen 
  with 
  expanded 
  summit 
  

   of 
  sac 
  fully 
  exposed, 
  showing 
  the 
  numerous 
  plates 
  in 
  the 
  

   median 
  part, 
  bordered 
  by 
  peripheral 
  spines. 
  

   3a. 
  Anterior 
  view 
  of 
  same 
  specimen. 
  

  

  Upper 
  Burlington 
  limestone 
  ; 
  Burlington, 
  Iowa. 
  

  

  HYDREIONOCRINUS 
  WETHERBYI 
  Wachsmuth 
  and 
  Springer 
  89,90 
  

  

  Figs. 
  4, 
  5, 
  0, 
  7, 
  S. 
  Basal 
  views 
  of 
  several 
  specimens, 
  showing 
  varia- 
  

   tion 
  in 
  basal 
  and 
  radianal 
  plates 
  ; 
  figs. 
  7 
  and 
  S 
  show 
  the 
  

   spiniferous 
  axillary 
  IBr 
  in 
  all 
  five 
  rays. 
  

   9. 
  Posterior 
  view 
  of 
  crown, 
  showing 
  nodose 
  or 
  spiniferous 
  

   axillaries. 
  

  

  10. 
  Anterior 
  view 
  of 
  crown, 
  showing 
  IBr 
  single 
  and 
  axillary. 
  

  

  contrasted 
  with 
  structure 
  of 
  same 
  ray 
  in 
  H. 
  depressvs. 
  

  

  11. 
  A 
  complete 
  crown, 
  somewhat 
  distorted, 
  with 
  the 
  flattened 
  distal 
  

  

  end 
  of 
  the 
  mushroom-shaped 
  sac 
  fully 
  exposed, 
  consisting 
  of 
  

   5 
  spiniferous 
  plates 
  meeting 
  in 
  the 
  middle. 
  

  

  12. 
  A 
  similar 
  crown, 
  with 
  the 
  spiniferous 
  canopy 
  much 
  larger, 
  

  

  composed 
  of 
  7 
  connected 
  plates, 
  and 
  showing 
  extreme 
  de- 
  

   velopment 
  of 
  the 
  spiniferous 
  primibrachs. 
  

   12ff. 
  Upper 
  side 
  of 
  spiniferous 
  canopy. 
  

  

  Upper 
  Chester, 
  Glen 
  Dean 
  formation 
  ; 
  Sloan's 
  Valley. 
  

   Kentucky, 
  except 
  figure 
  11, 
  which 
  is 
  from 
  Grayson 
  Springs. 
  

   132 
  

  

  