﻿298 
  PAL2E0NT0L0GI 
  OF 
  ILLINOIS. 
  

  

  Brachials 
  one 
  to 
  each 
  ray, 
  marly 
  as 
  wide 
  below 
  as 
  the 
  rad 
  

   constricted 
  above, 
  about 
  once 
  and 
  u 
  half 
  as 
  long 
  as 
  their 
  great- 
  

   width, 
  Bharply 
  angular 
  above, 
  and 
  Bupporting 
  cm 
  their 
  sloping 
  

   the 
  first 
  divisions 
  of 
  the 
  arm-. 
  

  

  Anns 
  composed 
  of 
  rounded 
  joints, 
  the 
  first 
  nearly 
  twice 
  as 
  Ion 
  

   wide, 
  scarcely 
  wedge-shaped 
  below 
  the 
  second 
  bifurcation, 
  and 
  divid- 
  

   ing 
  the 
  second 
  time 
  on 
  the 
  ninth 
  plate 
  above 
  the 
  brachials, 
  beyond 
  

  

  which 
  they 
  continue 
  simple, 
  making 
  four 
  arms 
  to 
  the 
  ray. 
  Bath 
  

   stout 
  pinnules 
  are 
  given 
  oil 
  from 
  the 
  Longest 
  side 
  of 
  the 
  arm 
  joints 
  

   on 
  alternate 
  sides. 
  

  

  The 
  first 
  anal 
  plate 
  is 
  rather 
  more 
  than 
  half 
  the 
  size 
  of 
  the 
  BUO- 
  

   radials, 
  pentagonal, 
  and 
  rests 
  between 
  two 
  of 
  the 
  posterior 
  subra- 
  

   dials. 
  and 
  under 
  the 
  lower 
  side 
  of 
  the 
  right 
  posterior 
  radial 
  plat 
  

   The 
  Becond 
  and 
  third 
  are 
  smaller 
  than 
  the 
  first, 
  the 
  second 
  

   partly 
  on 
  the 
  summit 
  of 
  the 
  left 
  suhradial, 
  and 
  the 
  third 
  on 
  the 
  

   BUmmit 
  Of 
  the 
  first 
  anal. 
  Column 
  unknown. 
  

  

  Position 
  and 
  locality: 
  Chester 
  Limestone, 
  Monroe 
  county. 
  Illinois. 
  

  

  No. 
  3460, 
  Dlinoifl 
  State 
  collection. 
  

  

  ro'iT.kioc'KiNis 
  rr.i 
  Ti.nias, 
  Worthcn. 
  

  

  PL 
  XXIX. 
  Fik'. 
  1". 
  

  

  /■,. 
  . 
  W. 
  Lin 
  ry. 
  l^J. 
  

  

  ,.- 
  ;ll 
  n 
  . 
  i 
  ! 
  • 
  MiiKt'iim 
  Of 
  Natural 
  I 
  

  

  Body 
  below 
  the 
  medium 
  size, 
  oboonic; 
  the 
  basals 
  being 
  bn 
  

  

  away 
  from 
  the 
  specim. 
  n, 
  it- 
  relative 
  proportions 
  cannot 
  tly 
  

  

  determined. 
  Fragments 
  of 
  two 
  of 
  the 
  basals 
  that 
  still 
  remain 
  

  

  taohed 
  show 
  thai 
  they 
  extended 
  above 
  and 
  beyond 
  the 
  columnar 
  

  

  far 
  

  

  Bubradialfl 
  about 
  a- 
  high 
  as 
  wide, 
  three 
  of 
  them 
  hexagonal, 
  and 
  

   two 
  beptagonal. 
  

  

  lials 
  pentagonal, 
  somewhat 
  irregular 
  In 
  the 
  1« 
  ft 
  i 
  

  

  ;m 
  ,l 
  (he 
  Lefl 
  ant. 
  ITO 
  lateral 
  OU 
  B 
  little 
  lar-er 
  than 
  the 
  Oth< 
  

  

  ;in 
  ,l 
  all 
  about 
  one 
  and 
  a 
  half 
  as 
  wide 
  as 
  loi 
  

  

  Bracbiala 
  One 
  to 
  the 
  ray. 
  that 
  OH 
  the 
  ant. 
  nor 
  ray 
  rather 
  the 
  

  

  Longest, 
  ti 
  about 
  as 
  1 
  middle, 
  

  

  and 
  sharply 
  angular 
  above, 
  supporting 
  on 
  ti 
  

  

  the 
  firs! 
  arm 
  plat' 
  

  

  first 
  division 
  on 
  th. 
  

   unequal 
  distances 
  from 
  the 
  sixth 
  to 
  the 
  tenth 
  plat 
  the 
  

  

  brachials 
  on 
  tour 
  of 
  the 
  i 
  ble 
  in 
  tl 
  dm 
  d 
  an 
  ain- 
  

  

  