﻿PALEONTOLOGY 
  OP 
  ELLINOK 
  

  

  the 
  ambulacra! 
  foi 
  . 
  hi 
  -)i 
  a 
  „ 
  the 
  

  

  rior, 
  prolonged 
  below, 
  and 
  each 
  bear 
  a 
  Bhort, 
  sharp 
  d 
  the 
  

  

  upper 
  part 
  of 
  the 
  inner 
  Bide, 
  d 
  urd 
  the 
  apei 
  of 
  the 
  ray. 
  

  

  Tli. 
  n 
  are 
  abont 
  eighty 
  adambulacrals 
  d 
  

   and 
  they 
  diminish 
  very 
  slowly 
  in 
  ward 
  th< 
  

  

  the 
  fu.-ifi 
  nin 
  enlargement 
  <>f 
  the 
  ray. 
  

  

  abut 
  upon 
  the 
  adambulacrala 
  in 
  

   they 
  are 
  Bubquadrangular, 
  or 
  polygonal, 
  and 
  each 
  l» 
  

   Btrong 
  centra] 
  spine. 
  Bii 
  longitudinal 
  rov. 
  

  

  side 
  (in 
  each 
  side 
  of 
  the 
  ambnlaoral 
  farrows; 
  th< 
  what 
  

  

  uniform 
  in 
  bum, 
  arranged 
  in 
  tram 
  ell 
  as 
  longitudinal 
  order, 
  

  

  unci 
  are 
  about 
  two-thirds 
  ae 
  numerous 
  in 
  a 
  longitudinal 
  r..w 
  as 
  the 
  

   platea 
  in 
  an 
  ambulacra] 
  

  

  oral 
  plateB, 
  madreporiform 
  tub 
  aknown, 
  

  

  cepl 
  bo 
  far 
  ae 
  we 
  may 
  judge 
  <>f 
  the 
  spinous 
  chi 
  

   from 
  those 
  visible 
  on 
  the 
  ventral 
  Bide. 
  

   This 
  large 
  and 
  beautiful 
  species 
  is 
  bo 
  distinct 
  from 
  any 
  hit! 
  

   [bed, 
  thai 
  no 
  comparison 
  is 
  necessary 
  for 
  the 
  purpose 
  <>f 
  

   tification. 
  

  

  Porition 
  and 
  locality: 
  Okaw 
  bluffs, 
  between 
  C 
  ad 
  Ka- 
  

  

  kia. 
  Randolph 
  county, 
  Illinois; 
  from 
  the 
  Beoond 
  division 
  of 
  the 
  

   (In 
  Bter 
  limestone. 
  

  

  Dlinois 
  State 
  collection 
  of 
  1880, 
  bj 
  A. 
  H. 
  Worthei 
  

  

  Body 
  truncate. 
  1 
  pentagonal, 
  central 
  ana 
  circular, 
  deep 
  and 
  I 
  

   in 
  proportion 
  to 
  the 
  rays; 
  rays 
  distant. 
  Bmall, 
  and 
  abruptly 
  

  

  truncated. 
  

  

  Dorsal 
  Bide 
  possessing 
  a 
  rather 
  large 
  centro-doraal 
  plate, 
  which 
  is 
  

   Burrounded 
  by 
  five 
  plates 
  occapying 
  the 
  position 
  of 
  i 
  while 
  

  

  the 
  other 
  part 
  is 
  covered 
  with 
  num. 
  aall 
  disc 
  pit 
  

  

  Tin- 
  ■'. 
  ■mis 
  being 
  founded 
  on 
  i 
  

   only, 
  further 
  particulars 
  will 
  be 
  found 
  in 
  th< 
  n 
  "f 
  th< 
  

  

  This 
  fossil 
  is 
  bo 
  widelj 
  nt 
  from 
  th. 
  

  

  that 
  we 
  think 
  it 
  h. 
  | 
  n,-t 
  family, 
  winch 
  might, 
  

  

  appropriate!] 
  >t. 
  .1 
  th. 
  it 
  until 
  oth< 
  

  

  found 
  sh..w 
  

  

  to 
  let 
  the 
  family 
  remain 
  Ulldefil 
  

  

  