﻿■im 
  PALEONTOLOGY 
  OF 
  H.LINni 
  

  

  lials 
  pentangular, 
  about 
  once 
  and 
  a 
  half 
  as 
  wide 
  as 
  long, 
  

   slightly 
  depressed 
  at 
  their 
  sides 
  and 
  lower 
  angles, 
  and 
  showing 
  a 
  

   distinct 
  suture 
  above, 
  where 
  they 
  join 
  the 
  brachial 
  plat 
  

  

  Brachials 
  two 
  to 
  the 
  anterior 
  ray. 
  the 
  first 
  one 
  of 
  which 
  is 
  quad- 
  

   rangular, 
  and 
  wider 
  than 
  high. 
  The 
  second 
  is 
  pentagonal, 
  loi 
  

   than 
  wide, 
  its 
  upper 
  angle 
  produced 
  into 
  an 
  obtuse 
  nodi, 
  and 
  

   porting 
  ou 
  its 
  upper 
  sloping 
  sides 
  the 
  first 
  divisions 
  of 
  the 
  arms. 
  

   The 
  two 
  anterodateral 
  rays 
  have 
  a 
  single 
  brachial, 
  about 
  the 
  

   size 
  and 
  form 
  of 
  the 
  Becond 
  brachial 
  on 
  the 
  anterior 
  ray, 
  and 
  sup- 
  

   port 
  on 
  their 
  upper 
  sides 
  the 
  first 
  divisions 
  of 
  the 
  rS 
  

  

  The 
  arms 
  are 
  composed 
  of 
  rounded, 
  quadrangular 
  joints, 
  and 
  all 
  

   divide 
  again 
  on 
  the 
  sixth 
  plate 
  above 
  the 
  brachials, 
  which 
  U 
  

   like 
  the 
  brachials, 
  and 
  beyond 
  this 
  they 
  appear 
  to 
  be 
  single 
  to 
  their 
  

   extremities, 
  giving 
  four 
  arms 
  to 
  each 
  ray. 
  Pinnules 
  rather 
  strong, 
  

   and 
  are 
  given 
  off 
  on 
  alternate 
  sides 
  from 
  the 
  upper 
  margins 
  of 
  the 
  

   arm 
  plates. 
  Anal 
  plates 
  unknown. 
  

  

  Column 
  round, 
  composed 
  near 
  the 
  body 
  of 
  thick 
  and 
  thinner 
  

   joints 
  alternately 
  arranged. 
  

  

  Position 
  and 
  locality: 
  Chester 
  limestone, 
  ( 
  111. 
  

  

  No. 
  2,449, 
  Illinois 
  State 
  collection. 
  

  

  I 
  take 
  pleasure 
  in 
  dedicating 
  this 
  prett] 
  Mrs. 
  .1. 
  ('. 
  

  

  Salter, 
  of 
  Chester, 
  in 
  recognition 
  of 
  her 
  enthusiastic 
  labors 
  in 
  

   Lecting 
  the 
  fossils 
  of 
  that 
  very 
  interesting 
  locality. 
  

  

  POTKBIOOBTJ 
  8, 
  Wortlieii. 
  

  

  PL 
  \\l 
  

  

  l'.nll. 
  tin 
  N<>. 
  I. 
  "I 
  lb.' 
  Hi 
  

  

  Body 
  of 
  medium 
  size, 
  basin-shaped, 
  about 
  tw 
  ::i^h 
  

  

  t.. 
  the 
  top 
  of 
  the 
  radial 
  

  

  Base 
  depressed, 
  and 
  the 
  baaala 
  nearly 
  concealed 
  by 
  tl 
  . 
  

   joints 
  of 
  a 
  large 
  pentalobate 
  column, 
  composed 
  of 
  thin 
  plates 
  with 
  

   Granulated 
  margins. 
  The 
  outer 
  angles 
  of 
  the 
  basala 
  are 
  barely 
  

   ble 
  in 
  the 
  pentalobate 
  depressions 
  of 
  th< 
  column. 
  The 
  columi 
  

   thai 
  rapidly 
  below 
  it- 
  junction 
  with 
  the 
  bodj 
  

  

  Bubradiala 
  a 
  little 
  wider 
  than 
  high, 
  the 
  two 
  ior 
  plafe 
  

  

  than 
  the 
  others, 
  and 
  all 
  by 
  two 
  or 
  I 
  oded 
  

  

  .it 
  oulminate 
  in 
  the 
  oentei 
  of 
  the 
  plate 
  in 
  a 
  sharp 
  node. 
  

  

  