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   All 
  figui"es 
  natural 
  size 
  

  

  Page 
  

  

  GILBERTSOCRINUS 
  DISPANSUS 
  Wachsmuth 
  and 
  Springer 
  38 
  

  

  Fig. 
  1. 
  Specimen 
  with 
  the 
  true 
  arms 
  in 
  place: 
  to 
  show 
  the 
  arms 
  par- 
  

   tially 
  recumbent, 
  with 
  the 
  position 
  of 
  the 
  arms 
  and 
  pinnules 
  

   apparently 
  opposite 
  in 
  the 
  same 
  in-dividual. 
  In 
  the 
  middle 
  

   pari 
  the 
  arms 
  bend 
  downward, 
  and 
  the 
  pinnules 
  arc 
  outer- 
  

   most, 
  away 
  from 
  the 
  calyx; 
  at 
  either 
  side 
  the 
  arms 
  make 
  

   a 
  reverse 
  curve, 
  bending 
  upwards, 
  so 
  that 
  the 
  pinnules 
  

   point 
  inwards 
  toward 
  the 
  calyx. 
  The 
  hump 
  at 
  the 
  top 
  is 
  a 
  

   Platyceras, 
  fastened 
  over 
  the 
  anal 
  opening 
  to 
  feed 
  upon 
  the 
  

   excrement 
  of 
  the 
  crinoid. 
  

  

  Keokuk 
  limestone: 
  Indian 
  < 
  'reek. 
  Indiana. 
  

  

  PARADICHOCRINUS 
  PLANUS, 
  new 
  species 
  51 
  

  

  Kiel!. 
  An 
  extremely 
  large 
  specimen, 
  with 
  5 
  or 
  4 
  arms 
  to 
  the 
  cluster 
  

   in 
  each 
  half 
  ray. 
  formed 
  by 
  successive 
  unilateral 
  branching 
  

   to 
  the 
  outer 
  side 
  of 
  the 
  dichotom. 
  The 
  very 
  thin- 
  and 
  smooth 
  

   calyx 
  plates 
  are 
  much 
  broken 
  by 
  pressure, 
  and 
  their 
  arrange- 
  

   ment 
  has 
  been 
  restored 
  from 
  other 
  specimens. 
  Interradial 
  

   view. 
  

  

  '■'•. 
  A 
  smaller 
  specimen 
  in 
  which 
  the 
  arrangement 
  of 
  the 
  calyx 
  

   plates 
  and 
  their 
  perfectly 
  smooth 
  surface 
  are 
  well 
  shown: 
  

   it 
  has 
  5 
  arms 
  to 
  each 
  outer 
  side 
  of 
  the 
  dichotom. 
  Interradial 
  

   view. 
  

  

  4. 
  A 
  calyx, 
  to 
  show 
  structure 
  of 
  the 
  tegmen. 
  

  

  Keokuk 
  limestone, 
  lower 
  hoi'izon; 
  Indian 
  Creek, 
  Indiana. 
  

  

  PARADICHOCRINUS 
  POLYDACTYLUS 
  Casseday 
  and 
  Lyon 
  50 
  

  

  Fig. 
  5. 
  Dorsal 
  view 
  of 
  a 
  vertically 
  flattened 
  calyx, 
  to 
  show 
  (he. 
  strong, 
  

   pustular 
  or 
  nodose 
  ornamentation, 
  in 
  contrast 
  to 
  the 
  smooth 
  

   surface 
  of 
  the 
  last 
  species. 
  

   6. 
  Posterior 
  view 
  of 
  a 
  calyx 
  with 
  nodose 
  ornament, 
  and 
  showing 
  

   the 
  great 
  elevation 
  of 
  tin. 
  tegmen. 
  For 
  the 
  arm 
  structure 
  

   of 
  this 
  species 
  see 
  Wachsmuth 
  and 
  Springer 
  (North 
  Amer. 
  

   < 
  Tin. 
  Cam., 
  pi. 
  77. 
  fig. 
  la). 
  

  

  Keokuk 
  limestone, 
  higher 
  horizon; 
  Crawfordsville, 
  Indiana. 
  

  

  113 
  

  

  