﻿294 
  PAL-ffiQNTOLOGY 
  OF 
  ELLINOI8. 
  

  

  The 
  first 
  anal 
  is 
  rather 
  smaller 
  than 
  the 
  Beoond, 
  and 
  i 
  

  

  i 
  two 
  of 
  the 
  Bubradials 
  and 
  against 
  t 
  he 
  right 
  idial, 
  

  

  and 
  i 
  summit 
  of 
  that 
  plate. 
  The 
  Beoond 
  radial 
  

  

  on 
  tin 
  tipper 
  margin 
  of 
  the 
  left 
  posterior 
  Bubradial, 
  and 
  the 
  third, 
  

   which 
  is 
  smaller 
  than 
  the 
  first, 
  rests 
  upon 
  it. 
  and 
  extends 
  up 
  to 
  

   the 
  middle 
  <>f 
  the 
  braehial 
  on 
  the 
  right. 
  

  

  Column 
  round, 
  but 
  only 
  a 
  few 
  joints 
  an 
  attached 
  t-> 
  the 
  Bpecii 
  

  

  Tli 
  - 
  i- 
  closely 
  allied 
  to 
  /'"'. 
  5 
  of 
  Hall. 
  

  

  but 
  differs 
  from 
  that 
  in 
  the 
  form 
  of 
  its 
  radial-, 
  hut 
  in. 
  dally 
  

  

  in 
  its 
  long 
  zigzag 
  arms. 
  

  

  ition 
  and 
  locality: 
  I 
  limestone, 
  near 
  Columbia, 
  Monroe 
  

  

  county. 
  111. 
  

  

  No. 
  2. 
  188, 
  Illinois 
  Btate 
  collection. 
  

  

  1'oiKi.io. 
  kivi 
  a 
  olttcb, 
  Worthen. 
  

  

  PI. 
  XXX. 
  lit;. 
  1". 
  

   />,, 
  •■-. 
  \v. 
  ry, 
  i«B. 
  

  

  Bulletin 
  N<>. 
  i. 
  "f 
  the 
  in- 
  

  

  ly 
  small, 
  oboonical, 
  length 
  and 
  breadth 
  at 
  the 
  top 
  of 
  the 
  radial 
  

   plates 
  about 
  equal. 
  i, 
  the 
  basal 
  plates 
  formin 
  

  

  themselves 
  a 
  low 
  pentagonal 
  cup. 
  Bubradials 
  about 
  

   high. 
  Radials 
  i 
  th 
  and 
  width 
  apparently 
  about 
  equal, 
  

  

  and 
  support 
  on 
  their 
  upper 
  mai 
  

  

  arm 
  plates, 
  making 
  hut 
  li\. 
  arm- 
  to 
  the 
  entin 
  animal. 
  

  

  The 
  first 
  arm 
  plat, 
  sun 
  the 
  two 
  rays 
  thai 
  wn 
  in 
  tl 
  

  

  men 
  before 
  me, 
  are 
  three 
  or 
  four 
  times 
  as 
  

  

  or 
  twelve 
  short, 
  r 
  plat 
  1- 
  all 
  

  

  rounded 
  externally 
  and 
  dry 
  longer 
  than 
  wide. 
  1 
  

  

  tiallj 
  it. 
  - 
  rved, 
  hut 
  th,- 
  form 
  of 
  

   clearlj 
  si 
  i 
  a. 
  l\ 
  

   and 
  ondi 
  r 
  tl 
  

  

  cylindrical 
  ventral 
  tube 
  ifl 
  preserved. 
  Remaii 
  liort 
  del 
  

  

  pinii 
  m. 
  attach 
  .1 
  t.» 
  the 
  inner 
  bord< 
  i 
  I 
  th.' 
  

  

  arm 
  plat 
  

  

  Columi 
  it. 
  thicker 
  at 
  it- 
  juncl 
  than 
  

  

  h. 
  low, 
  and 
  , 
  Wtb 
  till 
  

  

  i., 
  

  

  