﻿Plate 
  14 
  

  

  All 
  figures 
  natural 
  size 
  

  

  Page. 
  

   PTEROTOCRINUS 
  CORONARIUS 
  Lyon 
  4S 
  

  

  Figs. 
  1, 
  la, 
  lb, 
  le. 
  The 
  holotype, 
  with 
  the 
  dorsal 
  cup 
  added 
  to 
  the 
  teg- 
  

   minal 
  part 
  originally 
  figured 
  by 
  Lyon, 
  and 
  afterwards 
  by 
  

   Wachsmuth 
  and 
  Springer; 
  dorsal, 
  ventral, 
  antero- 
  and 
  pos- 
  

   tero-lateial 
  views: 
  showing 
  the 
  great 
  size 
  of 
  the 
  gibbous 
  

   radial 
  plates, 
  contrasted 
  with 
  those 
  of 
  all 
  other 
  known 
  species 
  

   and 
  the 
  huge, 
  massive 
  spatulate 
  processes 
  into 
  which 
  the 
  

   axillary 
  ambulacrals 
  have 
  developed. 
  

   2. 
  A 
  fractured 
  specimen 
  found 
  associated 
  with 
  the 
  preceding, 
  

   having 
  one 
  of 
  the 
  spatulate 
  " 
  wing 
  processes 
  *' 
  attached 
  to 
  the 
  

   dorsal 
  cup. 
  both 
  of 
  the 
  same 
  type 
  as 
  those 
  of 
  figure 
  1, 
  proving 
  

   beyond 
  question 
  that 
  the 
  two 
  belong 
  toegther. 
  

   8, 
  3a. 
  Basal 
  and 
  lateral 
  views 
  of 
  another 
  specimen 
  from 
  the 
  same 
  

   locality, 
  with 
  only 
  the 
  dorsal 
  cup 
  preserved. 
  

  

  Upper 
  Chester. 
  Golconda 
  formation 
  ; 
  Crittenden 
  County, 
  

   Kentucky. 
  

  

  PTEROTOCRINUS 
  DEPRESSUS 
  Lyon 
  and 
  Casseday 
  50 
  

  

  Figs. 
  4, 
  4a. 
  The 
  species 
  with 
  the 
  " 
  wing 
  processes 
  " 
  laterally 
  compressed 
  

   into 
  thin, 
  knife-like 
  "blades," 
  in 
  contrast 
  to 
  the 
  ponderous 
  

   appendages 
  of 
  most 
  of 
  the 
  other 
  species. 
  Lateral 
  view 
  of 
  

   calyx, 
  with 
  two 
  detached 
  "blades" 
  in 
  proper 
  position; 
  and 
  

   a 
  dorsal 
  view 
  for 
  comparison 
  of 
  form 
  and 
  proportions 
  of 
  

   basal 
  and 
  radial 
  plates 
  with 
  those 
  of 
  fig. 
  1. 
  

  

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

  

  Pulaski 
  County, 
  Kentucky. 
  

  

  PTEROTOCRINUS 
  BIFURCATUS 
  Wetherby 
  50 
  

  

  Fig. 
  5. 
  In 
  this 
  species 
  the 
  processes 
  of 
  the 
  heavy 
  rounded 
  type 
  have 
  

   developed 
  in 
  a 
  still 
  different 
  manner 
  by 
  forking 
  almost 
  at 
  

   right 
  angles. 
  After 
  Wetherby. 
  The 
  original 
  is 
  in 
  the 
  collec- 
  

   tion 
  of 
  the 
  University 
  of 
  Chicago. 
  

  

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

   Pulaski 
  County, 
  Kentucky. 
  

  

  TALAROCRINUS 
  CORNIGERUS 
  (Shumard) 
  40 
  

  

  Fig. 
  (i. 
  A 
  specimen 
  with 
  the 
  axillary 
  ambulacral 
  developed 
  into 
  prominent 
  

   spines 
  — 
  precursor 
  of 
  the 
  winged 
  processes 
  of 
  Pterotocrintts. 
  

  

  Lower 
  Chester. 
  Ohara 
  formal 
  on; 
  Tateville, 
  Pulaski 
  County, 
  

   Kentucky. 
  

  

  119 
  

  

  