﻿54 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  OT 
  

  

  1858. 
  A 
  constrictus 
  Hall, 
  Iowa, 
  p. 
  687, 
  pi. 
  25, 
  fig. 
  10. 
  

  

  Small, 
  narrow 
  conical 
  ; 
  IBB 
  divided, 
  high, 
  constricted, 
  more 
  than 
  

   % 
  total 
  height; 
  14/9/6. 
  Chester, 
  Illinois. 
  

   1867. 
  A. 
  papillatus 
  Worthen, 
  Bull. 
  1, 
  Illinois 
  State 
  Mus., 
  p. 
  36; 
  111., 
  vol. 
  7, 
  

   1882, 
  p. 
  315, 
  pi. 
  29, 
  fig. 
  17. 
  

  

  Small, 
  subovate, 
  wider 
  than 
  high 
  ; 
  IBB 
  divided, 
  with 
  2 
  or 
  3 
  joints 
  

   of 
  column 
  attached, 
  very 
  low 
  ; 
  8/11/2. 
  Probably 
  lower 
  Chester, 
  

   Monroe 
  County, 
  Illinois. 
  

   1S67. 
  A. 
  hemisphericus 
  Worthen, 
  Bull. 
  1, 
  Illinois 
  State 
  Mus., 
  p. 
  37 
  ; 
  111., 
  

   vol. 
  7, 
  1882, 
  p. 
  316, 
  pi. 
  29, 
  fig. 
  7. 
  

  

  Small, 
  low, 
  globose, 
  much 
  wider 
  than 
  high 
  ; 
  figures 
  show 
  column 
  

   facet 
  and 
  divided 
  IBB, 
  but 
  description 
  says 
  no 
  column 
  facet 
  ; 
  IBB 
  

   very 
  low 
  ; 
  6/9/1.5. 
  Randolph 
  County, 
  Illinois. 
  

   1S73. 
  A. 
  pentagonus 
  Worthen, 
  111., 
  vol. 
  5, 
  p. 
  556, 
  pi. 
  21, 
  figs. 
  10a, 
  6. 
  

  

  Small, 
  wider 
  than 
  high, 
  pentagonal 
  outline 
  ; 
  BB 
  concave 
  ; 
  IBB 
  

   divided, 
  with 
  distinct 
  column 
  facet, 
  low 
  ; 
  13/15/4. 
  Chester, 
  Illinois. 
  

   1873. 
  A. 
  globosus 
  Worthen 
  111., 
  vol. 
  5, 
  p. 
  557, 
  pi. 
  21, 
  figs. 
  12a, 
  o, 
  c. 
  

  

  Small, 
  globose, 
  wider 
  than 
  high 
  ; 
  IBB 
  divided, 
  with 
  small, 
  round 
  

   column 
  facet, 
  very 
  low 
  ; 
  12/14/2. 
  Chester, 
  Illinois. 
  

   1873. 
  A. 
  cliesterensis 
  Worthen, 
  111., 
  vol. 
  5, 
  p. 
  558, 
  pi. 
  21, 
  fig. 
  9. 
  

  

  Medium 
  size, 
  ovoid, 
  higher 
  than 
  wide 
  ; 
  faint 
  trace 
  of 
  column 
  at- 
  

   tachment, 
  but 
  no 
  suture 
  lines 
  visible 
  ; 
  IBB 
  low. 
  Chester, 
  Illinois. 
  

   1873. 
  A. 
  carbonarius 
  Worthen, 
  111., 
  vol. 
  5, 
  p. 
  566, 
  pi. 
  24, 
  fig. 
  4. 
  

  

  Fused 
  basal 
  cone 
  only. 
  Coal 
  Measures 
  ; 
  Shelby 
  County, 
  Illinois. 
  

   1896. 
  A. 
  ovalis 
  Miller 
  and 
  Gurley, 
  Bull. 
  9, 
  Illinois 
  State 
  Mus., 
  p. 
  36, 
  pi. 
  2, 
  

   figs. 
  13, 
  14. 
  

  

  Medium 
  size, 
  globose 
  ; 
  no 
  evidence 
  of 
  a 
  column 
  ; 
  IBB 
  very 
  low 
  ; 
  

   14/15/3. 
  Randolph 
  County, 
  Illinois. 
  

   1920. 
  A. 
  dissimilis 
  Weller, 
  Bull. 
  41, 
  Geol. 
  Surv. 
  Illinois, 
  p. 
  544, 
  pi. 
  5, 
  figs. 
  

   29, 
  30. 
  

  

  Small, 
  globose, 
  sutures 
  deeply 
  incised; 
  IBB 
  fused. 
  Lower 
  Chester, 
  

   Paint 
  Creek 
  formation 
  ; 
  St. 
  Clair 
  County, 
  Illinois. 
  

  

  Although 
  the 
  name 
  Agassisocrinus, 
  and 
  what 
  was 
  formerly 
  held 
  

   by 
  some 
  authors 
  to 
  be 
  the 
  type 
  species, 
  A. 
  dactyliformis, 
  was 
  given 
  

   by 
  Troost 
  in 
  1850, 
  yet 
  it 
  was 
  Owen 
  and 
  Shumard 
  who 
  first 
  published, 
  

   crediting 
  Troost 
  with 
  the 
  genus, 
  a 
  description 
  and 
  figure 
  of 
  a 
  species 
  

   of 
  their 
  own, 
  by 
  which 
  the 
  generic 
  characters 
  may 
  be 
  readily 
  recog- 
  

   nized 
  ; 
  therefore 
  under 
  the 
  law 
  of 
  priority 
  the 
  genus 
  must 
  be 
  credited 
  

   to 
  them, 
  and 
  their 
  species, 
  A. 
  conicus, 
  must 
  be 
  accepted 
  as 
  the 
  geno- 
  

   type. 
  The 
  fact 
  that 
  Shumard 
  two 
  years 
  later, 
  in 
  connection 
  with 
  

   the 
  description 
  and 
  figure 
  of 
  a 
  species 
  which 
  he 
  called 
  A. 
  dactyli- 
  

   formis, 
  published 
  a 
  short 
  account 
  of 
  the 
  genus, 
  crediting 
  both 
  to 
  

   Troost, 
  does 
  not 
  affect 
  the 
  record 
  with 
  regard 
  to 
  the 
  genus. 
  

  

  Even 
  as 
  to 
  the 
  species 
  the 
  record 
  is 
  peculiarly 
  complicated. 
  The 
  

   genus 
  is 
  most 
  widely 
  known 
  by 
  the 
  form 
  described 
  by 
  Roemer 
  in 
  

   the 
  Lethaea 
  Geognostica, 
  1855. 
  as 
  Astylocrinus 
  laevu, 
  with 
  a 
  beauti- 
  

   ful 
  figure 
  of 
  what 
  was 
  said 
  to 
  be 
  a 
  " 
  nearly 
  perfect 
  specimen," 
  made 
  

   from 
  a 
  cast 
  furnished 
  by 
  Shumard, 
  but 
  having 
  the 
  arms 
  considerably 
  

   restored. 
  This 
  figure, 
  somew 
  T 
  hat 
  amended, 
  was 
  copied 
  by 
  Pictet; 
  

  

  