﻿•iss 
  PALEONTOLOGY 
  OF 
  ILLIN- 
  

  

  anoe 
  to 
  the 
  outer 
  surface 
  of 
  the 
  body. 
  Radials 
  pentag 
  

   about 
  twice 
  as 
  wide 
  as 
  long, 
  depn 
  ased 
  at 
  their 
  lower 
  angles 
  t.> 
  oor- 
  

  

  respond 
  with 
  the 
  depressions 
  of 
  the 
  Bubradial 
  plat 
  

  

  Braohials 
  two. 
  tin- 
  first 
  quadrangular, 
  and 
  the 
  aeoond 
  pentangular, 
  

   supporting 
  on 
  their 
  upper 
  sloping 
  sides 
  the 
  first 
  divisions 
  of 
  the 
  

   ray-. 
  All 
  the 
  plates 
  to 
  the 
  top 
  of 
  the 
  second 
  brachials 
  possess 
  the 
  

   rugged 
  character 
  mentioned 
  above. 
  Anal 
  sent- 
  unknown. 
  Arms 
  

   not 
  preserved 
  on 
  the 
  anterior 
  ray. 
  hut 
  from 
  the 
  partial 
  preservation 
  

   of 
  those 
  on 
  tin 
  posterior 
  ride 
  then- 
  seems 
  to 
  be 
  not 
  more 
  than 
  two 
  

   to 
  each 
  ray. 
  Column 
  round 
  and 
  rather 
  delicate, 
  COmpOf 
  

   the 
  hody, 
  of 
  joints 
  of 
  unequal 
  - 
  

  

  Geological 
  ]>nsiti<»i 
  <ui>l 
  locality: 
  Warsaw 
  heds 
  of 
  the 
  St. 
  Louis 
  

   group, 
  Warsaw, 
  111. 
  

  

  No. 
  2,468, 
  Illinois 
  State 
  collection. 
  

  

  P< 
  ir.i;io.i;iM 
  B 
  GliAl 
  B, 
  Wort: 
  

  

  PL 
  XX 
  \ 
  

  

  February, 
  1882. 
  

  

  • 
  t 
  n 
  No. 
  1. 
  "f 
  tli" 
  Hi 
  I 
  ;irul 
  History, 
  p. 
  IS 
  

  

  Body 
  "f 
  medium 
  Bize, 
  basin-shaned, 
  about 
  once 
  and 
  a 
  half 
  as 
  

   wide 
  as 
  Ihl'Ii 
  to 
  the 
  top 
  of 
  the 
  radial 
  Berii 
  

  

  Basals 
  small 
  and 
  entirely 
  concealed 
  in 
  the 
  basal 
  concavity 
  by 
  the 
  

   first 
  columnar 
  joints. 
  Subradiala 
  nearly 
  or 
  quite 
  as 
  long 
  as 
  « 
  

   their 
  lower 
  angles 
  curving 
  into 
  the 
  hasal 
  concavity. 
  

  

  lialfl 
  once 
  and 
  a 
  half 
  ;is 
  wide 
  as 
  long, 
  i" 
  1. 
  and 
  trun- 
  

  

  i 
  squarely 
  across 
  the 
  opper 
  margins 
  for 
  th< 
  d 
  of 
  the 
  

  

  brachial 
  

   Braohials 
  on 
  three 
  of 
  the 
  rays 
  about 
  the 
  Ban 
  md 
  form 
  as 
  

  

  the 
  radials, 
  and 
  give 
  support 
  on 
  their 
  upper 
  slo] 
  • 
  the 
  

  

  OS 
  of 
  the 
  r;i 
  

  

  The 
  an 
  at 
  and 
  number 
  of 
  the 
  i 
  moot 
  be 
  detenu 
  

  

  from 
  tlie 
  sp 
  in 
  hand, 
  hut 
  in 
  the 
  right 
  ant. 
  to 
  lateral 
  ray 
  a 
  

  

  bifurcation 
  takes 
  place 
  on 
  the 
  sixth 
  plate 
  above 
  the 
  brachial, 
  

  

  yond 
  which 
  the 
  division-, 
  :uv 
  unknown. 
  Ti. 
  .1 
  of 
  

  

  it 
  quadrangular 
  plat. 
  . 
  and 
  would 
  be 
  

  

  I 
  when 
  fold. 
  i 
  :,n:, 
  1 
  plates 
  are 
  

  

  i 
  iii 
  the 
  Bpecimen 
  and 
  r 
  examination, 
  the 
  first 
  one 
  pet 
  

   onal, 
  kweea 
  two 
  of 
  the 
  inbradials, 
  and 
  party 
  under 
  the 
  

  

  