﻿290 
  PAL 
  EONTOLOGI 
  OF 
  ILLINOIS. 
  

  

  PoTBiuooBiinjs 
  Vabsovqhsib, 
  Worthen. 
  

  

  PI. 
  XXVIII 
  1 
  

  

  Pott 
  

  

  Bulletin 
  N<>. 
  1. 
  "f 
  the 
  Dili 
  ■>'• 
  P- 
  1 
  ' 
  1 
  

  

  Body 
  below 
  the 
  medium 
  siae, 
  baain-ahaped, 
  a 
  Little 
  more 
  than 
  

  

  twice 
  as 
  wide 
  as 
  high 
  to 
  the 
  top 
  of 
  the 
  radial 
  series. 
  

  

  Baae 
  depressed, 
  the 
  basal 
  plates 
  and 
  the 
  lower 
  angles 
  of 
  the 
  rab- 
  

   radials 
  forming 
  the 
  basal 
  depression. 
  

  

  Bubradials 
  on 
  the 
  anterior 
  side 
  hexagonal, 
  sharply 
  angular 
  above 
  

   and 
  extending 
  op 
  about 
  half 
  the 
  length 
  of 
  the 
  radial 
  plat 
  

  

  Badials 
  pentagonal, 
  wider 
  than 
  high, 
  the 
  artieulating 
  sear 
  ■ 
  

   pying 
  the 
  entire 
  width 
  of 
  the 
  plate, 
  with 
  a 
  well-defined 
  BUttUN 
  

   tween 
  the 
  radial 
  and 
  brachial 
  serii 
  

  

  Braohials, 
  two 
  to 
  the 
  ray 
  on 
  the 
  anterior 
  side, 
  the 
  firot 
  quadran- 
  

   gular 
  and 
  the 
  second 
  pentagonal, 
  sharply 
  angular 
  above, 
  and 
  sup- 
  

   poiidngoii 
  their 
  sloping 
  sides 
  the 
  drat 
  divisions 
  of 
  the 
  rays, 
  (hi 
  two 
  

   of 
  the 
  ray- 
  the 
  arms 
  bifurcate 
  again 
  on 
  the 
  sixth 
  plate 
  above 
  the 
  

   brachial 
  series, 
  beyond 
  which 
  they 
  are 
  unknown. 
  All 
  the 
  plat, 
  

   the 
  body 
  are 
  finely 
  rugose. 
  Anal 
  series 
  unknown. 
  

  

  Column 
  slightly 
  pentagonal 
  where 
  it 
  joins 
  the 
  body, 
  and 
  comp 
  

   of 
  alternate 
  thin 
  and 
  thicker 
  joints, 
  hut 
  helow 
  more 
  maaaive 
  joints 
  

   are 
  intercalated 
  at 
  short 
  intervals. 
  

  

  Geological 
  poritkm 
  and 
  locality: 
  Warsaw 
  beds 
  of 
  th< 
  8t. 
  Louis 
  

   group, 
  Warsaw, 
  Illinois. 
  

  

  No. 
  2,468, 
  Qlinoifl 
  State 
  collection. 
  

  

  PoTBBIOOBaroa 
  BPINQBBACHIATU8, 
  Worth, 
  n. 
  

  

  PL 
  \M\. 
  Pfe 
  I. 
  

   /•,. 
  ry. 
  IWa 
  

  

  Bulletin 
  Ho 
  i, 
  of 
  the 
  Ul 
  l 
  •*• 
  

  

  Body 
  of 
  medium 
  siae, 
  baain-shaped, 
  about 
  twioe 
  a- 
  wide 
  as 
  I 
  

  

  to 
  the 
  top 
  of 
  the 
  radial 
  Baae 
  Slightly 
  depressed, 
  the 
  under 
  

  

  ils 
  small 
  and 
  concealed 
  by 
  the 
  Oral 
  columnar 
  joint 
  

   Bubradials 
  about 
  as 
  wide 
  a 
  the 
  lower 
  ai 
  irved 
  in* 
  

  

  forming 
  a 
  part 
  <>f 
  the 
  baaal 
  concavity. 
  

  

  about 
  one-fourth 
  wider 
  than 
  long, 
  i» 
  

  

  \.di 
  them 
  and 
  the 
  

   !ual 
  plat 
  

  

  