﻿Pago 
  

   Figs. 
  10b, 
  lib. 
  Cross 
  sectional 
  views 
  of 
  the 
  fractured 
  arms 
  of 
  the 
  two 
  63 
  

   preceding 
  specimens, 
  in 
  which 
  the 
  inequality 
  of 
  the 
  arms 
  in 
  

   both 
  is 
  still 
  more 
  apparent. 
  

  

  12. 
  A 
  calyx 
  from 
  Stephensport, 
  Breckenridge 
  County, 
  Kentucky, 
  

  

  in 
  the 
  upper 
  series 
  of 
  the 
  Chester, 
  showing 
  the 
  unequal 
  faces 
  

   of 
  a 
  lateral 
  primibrach. 
  

  

  13. 
  The 
  original 
  of 
  Lyon's 
  proposed 
  description. 
  A 
  nearly 
  com- 
  

  

  plete 
  crown, 
  with 
  the 
  two 
  pairs 
  of 
  posterior 
  arms 
  and 
  the 
  

   enormously 
  hypertrophied 
  antero-lateral 
  arms 
  in 
  full 
  view 
  ; 
  

   giving 
  a 
  complete 
  exposition 
  of 
  the 
  dominant 
  character 
  of 
  

   the 
  genus. 
  Grayson 
  Springs, 
  Grayson 
  County, 
  Kentucky. 
  X 
  -§. 
  

   Upper 
  Chester, 
  Glen 
  Dean 
  formation. 
  

  

  AGASSIZOCRINUS 
  GLOBOSUS 
  Worthen 
  54, 
  63 
  

  

  Fig. 
  14. 
  Posterior 
  view 
  of 
  calyx, 
  slightly 
  less 
  broadly 
  rounded 
  than 
  the 
  

  

  type 
  ; 
  one 
  of 
  a 
  number 
  of 
  specimens 
  of 
  this 
  and 
  the 
  following 
  

  

  species 
  varying 
  slightly 
  in 
  contour 
  from 
  strictly 
  globose 
  to 
  

  

  subovate. 
  Near 
  Hardinsburg, 
  Breckenridge 
  County, 
  Kentucky. 
  

  

  Upper 
  Chester, 
  Gasper 
  formation. 
  

  

  AGASSIZOCRINUS 
  OVALIS 
  Miller 
  and 
  Gurley 
  .__ 
  54,63 
  

  

  Figs. 
  15, 
  16, 
  17. 
  Posterior, 
  anterior, 
  and 
  distal 
  views 
  of 
  three 
  calices 
  from 
  

   same 
  locality 
  as 
  the 
  last 
  ; 
  that 
  of 
  fig. 
  17 
  to 
  show 
  by 
  direct 
  

   view 
  the 
  relative 
  width 
  of 
  the 
  radials. 
  There 
  is 
  practically 
  

   no 
  difference 
  between 
  the 
  specimens 
  referred 
  to 
  this 
  and 
  the 
  

   preceding 
  species 
  except 
  the 
  divided 
  and 
  fused 
  infrabasal 
  

   cone, 
  and 
  as 
  to 
  this 
  there 
  are 
  apparently 
  intermediate 
  stages, 
  

   as 
  well 
  as 
  variation 
  in 
  contour 
  from 
  ovoid 
  to 
  globose. 
  

   Horizon 
  and 
  locality 
  same 
  as 
  last. 
  

  

  AGASSIZOCRINUS, 
  species 
  57 
  

  

  Figs. 
  IS, 
  10, 
  20. 
  Dorsal 
  views 
  and 
  a 
  lateral 
  view 
  of 
  thi-ee 
  bases, 
  from 
  

   same 
  locality 
  as 
  last, 
  in 
  different 
  stages 
  of 
  division 
  of 
  infra- 
  

   basals 
  ; 
  the 
  sutures 
  being 
  more 
  or 
  less 
  obscure, 
  in 
  some 
  deviat- 
  

   ing 
  from 
  a 
  straight 
  line, 
  and 
  in 
  some 
  passing 
  only 
  part 
  way 
  

   down. 
  A 
  number 
  of 
  other 
  specimens 
  exhibit 
  similar 
  unstable 
  

   features; 
  and 
  the 
  condition 
  of 
  the 
  Breckenridge 
  County 
  forms 
  

   as 
  here 
  shown 
  leads 
  to 
  the 
  inference 
  that 
  in 
  this 
  formation 
  

   at 
  least 
  the 
  IBB 
  may 
  be 
  divided 
  or 
  fused 
  in 
  the 
  adult 
  stage 
  

   within 
  the 
  same 
  species. 
  

  

  Upper 
  Chester, 
  Gasper 
  formation; 
  Breckenridge 
  County, 
  

   Kentucky. 
  

   AGASSIZOCRINUS, 
  species 
  56 
  

  

  Figs. 
  21, 
  22. 
  23. 
  Three 
  infrabasal 
  cones 
  from 
  Huntsville, 
  Alabama, 
  per- 
  

   haps 
  of 
  the 
  same 
  species, 
  of 
  minimum, 
  medium, 
  and 
  maxi- 
  

   mum 
  size: 
  the 
  first 
  two 
  being 
  solidly 
  fused, 
  and 
  the 
  last, 
  fig. 
  

   23, 
  being 
  divided 
  by 
  distinct 
  sutures 
  at 
  the 
  distal 
  face 
  which 
  

   extend 
  almost 
  to 
  the 
  lower 
  end. 
  

   Upper 
  Chester, 
  Gasper 
  formation. 
  

  

  AGASSIZOCRINUS. 
  species__ 
  57 
  

  

  Fig. 
  24. 
  Distal 
  face 
  of 
  a 
  fused 
  cone 
  in 
  winch 
  t 
  lie 
  axial 
  nerve 
  canals, 
  

   being 
  restricted 
  in 
  their 
  downward 
  course, 
  are 
  split 
  into 
  radiat- 
  

   ing 
  branches 
  passing 
  outward 
  into 
  the 
  wall 
  of 
  the 
  cup. 
  

   25. 
  Similar 
  cone 
  in 
  which 
  the 
  nerve 
  canals 
  penetrate 
  the 
  fused 
  in- 
  

   frabasals 
  undivided 
  for 
  part 
  of 
  their 
  length. 
  

   Upper 
  Chester, 
  Gasper 
  formation: 
  Huntsville. 
  

   122 
  

  

  