﻿812 
  PALJBONTOLOGI 
  OF 
  [LLINOI8, 
  

  

  Three 
  anal 
  plates 
  are 
  visible, 
  the 
  first 
  is 
  pentagonal, 
  larger 
  than 
  

   both 
  the 
  others, 
  nodose 
  like 
  the 
  Bubradials 
  between 
  which 
  it 
  i 
  

  

  while 
  its 
  upper 
  angle 
  extends 
  a 
  little 
  above 
  the 
  radial 
  on 
  the 
  right. 
  

  

  The 
  Beoond 
  anal 
  rests 
  upon 
  the 
  upper 
  truncated 
  margin 
  of 
  the 
  left 
  

   rior 
  suhradial, 
  and 
  the 
  third 
  between 
  the 
  first 
  and 
  Beoond 
  anals. 
  

  

  Column 
  round 
  and 
  rather 
  small 
  for 
  the 
  size 
  of 
  th. 
  I 
  

  

  This 
  species 
  is 
  related 
  to 
  Lyons' 
  E 
  quator-deeimbrachialU, 
  hut 
  dif- 
  

  

  in 
  its 
  less 
  massive 
  form, 
  and 
  in 
  the 
  camber 
  of 
  its 
  amis. 
  

   PotvAon 
  and 
  locality: 
  Chester 
  limestone. 
  Monroe 
  county. 
  111. 
  

   No. 
  2,448, 
  Illinois 
  State 
  collection. 
  

  

  EUPAOHTOBINTTS 
  ftfOHBOBKBIB, 
  Worthcii. 
  

  

  PL 
  XXIX. 
  Fit:. 
  IS. 
  

  

  February. 
  1882. 
  

  

  Bulletin 
  No. 
  i. 
  "f 
  t 
  ii<- 
  Dllnola 
  Btate 
  ICoseom 
  "f 
  Natural 
  History, 
  i 
  

  

  Body 
  of 
  medium 
  size, 
  low, 
  basin-shaped, 
  composed 
  of 
  mac 
  

  

  plates. 
  

   Basals 
  small, 
  triangular 
  ahove 
  and 
  below, 
  the 
  inner 
  angles 
  bent 
  

  

  downward 
  under 
  the 
  column, 
  and 
  the 
  outer 
  ones 
  bent 
  slightly 
  upward 
  

  

  in 
  tween 
  the 
  Bubradials. 
  

   Bubradials 
  protuberant, 
  Bub-hemispherio 
  externally, 
  generally 
  

   angular, 
  the 
  one 
  on 
  the 
  anal 
  Bide 
  a 
  little 
  larger 
  than 
  th 
  

  

  and 
  truncated 
  on 
  its 
  upper 
  margin 
  for 
  the 
  support 
  of 
  the 
  anal 
  plate. 
  

  

  l;> 
  Hals 
  pentagonal, 
  about 
  twiee 
  as 
  wide 
  as 
  long, 
  and 
  trun< 
  

   entinly 
  across 
  their 
  upper 
  margins 
  for 
  the 
  reception 
  of 
  the 
  r 
  

  

  Anals 
  one, 
  quadrangular, 
  length 
  and 
  width 
  about 
  equal, 
  extending 
  

   above 
  to 
  a 
  level 
  with 
  the 
  summit 
  of 
  the 
  adjaoenl 
  radials, 
  and 
  

   below 
  on 
  the 
  truncated 
  upper 
  margin 
  of 
  the 
  right 
  posterior 
  

   radial. 
  

  

  Arm- 
  and 
  column 
  unknown. 
  

  

  Thi 
  related 
  to 
  Eupaek. 
  Jbrnumu 
  Bury. 
  111.. 
  VoL 
  ■".. 
  

  

  549, 
  hut 
  differs 
  from 
  that 
  in 
  the 
  proportions 
  of 
  u> 
  radial 
  i 
  

  

  ..,,1,1 
  the 
  BUbglobose 
  character 
  of 
  its 
  suhradials. 
  

   /■ 
  Utty\ 
  I 
  HI. 
  

  

  No. 
  2,4 
  17. 
  Him 
  Iciion. 
  

  

  