﻿Plate 
  15 
  

   All 
  figures 
  natural 
  size 
  unless 
  otherwise 
  noted 
  

  

  AGASSIZOCRINUS 
  CONICUS 
  Owen 
  and 
  Shunmrd 
  53,59,63 
  

  

  Fig. 
  1. 
  The 
  holotype, 
  from 
  Chester, 
  Illinois. 
  Note 
  (lie 
  great 
  length 
  of 
  

   the 
  fused 
  intranasal 
  cone, 
  over 
  half 
  the 
  total 
  height 
  of 
  the 
  

   calyx. 
  The 
  sharply 
  conical 
  contour 
  is 
  not 
  an 
  inflexible 
  char- 
  

   acter 
  for 
  the 
  species, 
  as 
  there 
  is 
  upon 
  the 
  same 
  matrix 
  with 
  

   the 
  type 
  another 
  specimen 
  with 
  a 
  more 
  rounded 
  ovoid 
  nut- 
  

   line; 
  hut 
  the 
  high 
  IBB 
  cone 
  seems 
  to 
  hold 
  good. 
  Coll. 
  I". 
  S. 
  

   National 
  Museum, 
  No. 
  17937. 
  

   2. 
  A 
  very 
  large 
  specimen 
  also 
  from 
  Chester, 
  more 
  broadly 
  rounded 
  

   than 
  the 
  type, 
  with 
  II'.P. 
  half 
  the 
  height 
  of 
  calyx. 
  

   3,4. 
  Two 
  very 
  elongate 
  fused 
  IBB 
  cones, 
  perhaps 
  of 
  this 
  species. 
  

   hut 
  much 
  smaller 
  than 
  that 
  of 
  the 
  type; 
  part 
  of 
  a 
  scries 
  of 
  

   111 
  or 
  more 
  similar 
  elongate 
  bases 
  found 
  at 
  the 
  same 
  locality 
  

   in 
  Union 
  County. 
  Illinois, 
  varying 
  in 
  contour 
  from 
  conical 
  in 
  

   ovoid, 
  but 
  agreeing 
  in 
  the 
  extremely 
  high 
  IBB. 
  Fig. 
  4 
  is 
  from 
  

   a 
  specimen 
  longitudinally 
  bisected, 
  showing 
  the 
  axial 
  canal 
  

   extending 
  almost 
  to 
  the 
  end 
  of 
  the 
  fused 
  cone. 
  

   Upper 
  part 
  of 
  Chester, 
  Okaw 
  formation. 
  

  

  AGASSIZOCRINUS 
  LAEVIS 
  (Roemer)__ 
  53,55,63 
  

  

  l'to. 
  5. 
  The 
  holotype. 
  original 
  of 
  Roomer's 
  figure, 
  formerly 
  in 
  the 
  collec- 
  

   tion 
  of 
  B. 
  F. 
  Shunmrd. 
  A 
  direct 
  photograph, 
  showing 
  the 
  

   arms 
  as 
  they 
  actually 
  are 
  in 
  the 
  specimen 
  (partly 
  restored 
  in 
  

   the 
  type 
  figure), 
  and 
  the 
  anal 
  plates 
  (not 
  shown 
  in 
  the 
  original 
  

   figure). 
  The 
  r. 
  post, 
  ray 
  is 
  well 
  shown 
  nearly 
  to 
  the 
  end 
  of 
  

   the 
  arms. 
  [BB, 
  though 
  solidly 
  fused 
  at 
  the 
  bottom, 
  have 
  

   sutures 
  for 
  a 
  shori 
  distance 
  from 
  the 
  upper 
  margin. 
  Chester. 
  

   Illinois. 
  

   5a. 
  L. 
  ant. 
  view 
  of 
  same, 
  showing 
  the 
  great 
  width 
  of 
  the 
  radial, 
  the 
  

   axillary 
  H'.r 
  with 
  its 
  unequal 
  faces, 
  and 
  the 
  increased 
  size 
  

   of 
  the 
  left 
  arm 
  as 
  compared 
  with 
  those 
  of 
  the 
  adjoining 
  r. 
  

   post. 
  ray. 
  

   6,7. 
  Anterior 
  and 
  posterior 
  views 
  of 
  two 
  calices 
  from 
  Clear 
  ('reek. 
  

   Hardin 
  County, 
  Kentucky. 
  

  

  Upper 
  Chester. 
  Okaw, 
  and 
  Glen 
  Dean 
  formations. 
  

  

  AGASSIZOCRINUS 
  GIBBOSUS 
  Hall 
  53,63 
  

  

  Figs. 
  8, 
  '•». 
  Posterior 
  and 
  anterior 
  views 
  of 
  two 
  characteristic 
  specimens. 
  

   that 
  of 
  fig. 
  8 
  being 
  perfectly 
  typical. 
  

  

  Upper 
  Chester. 
  (>kaw 
  formation; 
  Chester, 
  Illinois. 
  

  

  AGASSIZOCRINUS 
  INEQUIDACTYLUS 
  (Whitfield) 
  57,62,63 
  

  

  Figs. 
  10, 
  10a. 
  Posterior 
  and 
  anterior 
  views 
  of 
  specimen 
  from 
  Sloan's 
  

   Valley. 
  Pulaski 
  County, 
  Kentucky, 
  with 
  arms 
  broken 
  off 
  

   slightly 
  above 
  the 
  primibrachs; 
  showing 
  the 
  unequal 
  radlals, 
  

   small 
  size 
  of 
  anterior 
  arm. 
  and 
  unequal 
  faces 
  of 
  the 
  antero- 
  

   lateral 
  primibraeh. 
  

   11, 
  11". 
  Similar 
  views 
  of 
  another 
  specimen 
  from 
  the 
  same 
  local- 
  

   ity, 
  having 
  part 
  of 
  the 
  hypertrophied 
  left 
  lateral 
  arm 
  pre- 
  

   served, 
  showing 
  its 
  great 
  size 
  as 
  compared 
  with 
  those 
  adjacent. 
  

  

  121 
  

  

  