﻿INVEBTEBBATES. 
  317 
  

  

  Genus 
  LECYTHIOCBINUS, 
  White. 
  

   Lecythiocrinus 
  Adamsi, 
  Worthen. 
  

  

  PL 
  XXXI, 
  Pig. 
  8. 
  

   Lecythiocrinus 
  Adamsi, 
  Worthen, 
  Feb. 
  1882. 
  

   Bulletin 
  No. 
  1, 
  of 
  the 
  Illinois 
  State 
  Museum 
  of 
  Natural 
  History, 
  p. 
  37. 
  

  

  Body 
  of 
  medium 
  size, 
  irregularly 
  subovoid, 
  slightly 
  pentalobate, 
  

   as 
  seen 
  from 
  above 
  or 
  below, 
  from 
  the 
  protuberance 
  of 
  the 
  radial 
  

   plates, 
  and 
  composed 
  of 
  smooth 
  and 
  rather 
  thin 
  plates. 
  The 
  base 
  

   is 
  convex, 
  and 
  occupies 
  about 
  one-fourth 
  the 
  entire 
  length 
  of 
  the 
  

   body. 
  

  

  Subradials 
  a 
  little 
  longer 
  than 
  wide, 
  with 
  an 
  angular 
  prominence 
  

   just 
  above 
  the 
  middle 
  of 
  each 
  plate, 
  extending 
  from 
  the 
  center 
  to 
  

   the 
  upper 
  margins. 
  

  

  Eadials 
  about 
  half 
  as 
  large 
  as 
  the 
  subradials, 
  length 
  and 
  width 
  

   about 
  equal, 
  triangular 
  below, 
  the 
  angles 
  fitting 
  into 
  the 
  depressions 
  

   between 
  the 
  subradials. 
  They 
  are 
  all 
  surmounted 
  by 
  a 
  small 
  semi- 
  

   circular 
  arm-facet, 
  from 
  which 
  a 
  shallow 
  groove 
  extends 
  to 
  a 
  central 
  

   opening 
  in 
  the 
  summit. 
  

  

  Just 
  above 
  the 
  summit 
  of 
  one 
  of 
  the 
  subradials, 
  and 
  in 
  the 
  lat- 
  

   eral 
  angles 
  of 
  two 
  of 
  the 
  radial 
  plates, 
  there 
  appears 
  to 
  have 
  been 
  

   a 
  circular 
  opening, 
  rather 
  larger 
  than 
  the 
  arm-facets, 
  which 
  is 
  now 
  

   filled 
  with 
  stony 
  matter, 
  — 
  and 
  whether 
  this 
  is 
  an 
  anal 
  opening, 
  or 
  

   an 
  accidental 
  break 
  in 
  the 
  test 
  of 
  the 
  body, 
  is 
  a 
  question 
  to 
  be 
  de- 
  

   termined 
  from 
  additional 
  material. 
  Columnar 
  facet 
  scarcely 
  larger 
  

   than 
  that 
  for 
  the 
  reception 
  of 
  the 
  arms. 
  Arms 
  and 
  column 
  un- 
  

   known. 
  

  

  We 
  take 
  pleasure 
  in 
  dedicating 
  this 
  unique 
  fossil 
  to 
  Mr. 
  W. 
  H. 
  

   Adams, 
  of 
  Elmore, 
  Peoria 
  county, 
  who 
  found 
  it 
  on 
  section 
  13, 
  town- 
  

   ship 
  11 
  north, 
  range 
  6 
  east, 
  Peoria 
  county. 
  

  

  It 
  is 
  from 
  about 
  the 
  horizon 
  of 
  Coal 
  No. 
  8 
  of 
  the 
  Lower 
  Coal 
  

   Measures. 
  

   No. 
  2,468 
  of 
  Illinois 
  State 
  collection. 
  

  

  