﻿76 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.67 
  

  

  ULRICHICRINUS 
  OKLAHOMA, 
  new 
  species 
  

  

  Plate 
  20, 
  figs. 
  1, 
  2 
  

  

  Specimens 
  large, 
  crown 
  about 
  10 
  cm. 
  high. 
  Calyx 
  rather 
  low, 
  

   turbinate; 
  IBr 
  filling 
  distal 
  face 
  of 
  RR. 
  Anal 
  side 
  with 
  strong 
  

   plates 
  of 
  Poteriocrinid 
  type, 
  with 
  RA; 
  post. 
  B 
  wide, 
  narrowing 
  to 
  

   a 
  very 
  small 
  apex, 
  barely 
  truncate, 
  followed 
  by 
  a 
  narrow 
  anal 
  plate 
  

   x, 
  with 
  a 
  large 
  RA 
  at 
  the 
  right. 
  IBB 
  rather 
  tall 
  and 
  erect. 
  BB 
  

   almost 
  as 
  large 
  as 
  RR. 
  

  

  Arms 
  long 
  and 
  deeply 
  rounded, 
  unbranched, 
  pinnulate, 
  of 
  about 
  

   uniform 
  thickness 
  to 
  near 
  the 
  extremities, 
  where 
  they 
  taper 
  rapidly 
  ; 
  

   they 
  are 
  uniserial, 
  composed 
  of 
  extremely 
  short, 
  cuneate 
  brachials, 
  

   which 
  in 
  the 
  median 
  portion 
  of 
  the 
  arm 
  interlock 
  to 
  the 
  stage 
  of 
  

   incipient 
  biseriality, 
  but 
  become 
  uniserial 
  again 
  towards 
  the 
  ends. 
  

   Hence 
  the 
  pinnules 
  springing 
  from 
  the 
  long 
  faces 
  of 
  the 
  brachials 
  

   are 
  seen 
  on 
  successive 
  ossicles 
  in 
  the 
  middle 
  portion 
  and 
  on 
  alternate 
  

   ossicles 
  towards 
  the 
  distal 
  ends. 
  Stem 
  strong, 
  round, 
  composed 
  of 
  

   alternate 
  long 
  and 
  short 
  columnals, 
  contrasting 
  greatly 
  in 
  length, 
  the 
  

   shorter 
  ones 
  being 
  almost 
  linear. 
  

  

  The 
  species 
  is 
  to 
  be 
  compared 
  with 
  Poteriocrinus 
  coryphaeus 
  S. 
  A. 
  

   Miller, 
  of 
  the 
  Keokuk 
  limestone, 
  which 
  has 
  flatter 
  and 
  broader 
  arms, 
  

   with 
  longer 
  brachials 
  in 
  the 
  lower 
  part, 
  but 
  nowhere 
  tending 
  to 
  in- 
  

   terlock. 
  Post. 
  B 
  is 
  not 
  quite 
  so 
  narrow 
  at 
  the 
  top, 
  and 
  is 
  of 
  smaller 
  

   size, 
  but 
  the 
  general 
  type, 
  number 
  and 
  mode 
  of 
  branching 
  of 
  the 
  

   arms, 
  are 
  substantially 
  the 
  same. 
  

  

  There 
  are 
  two 
  specimens 
  of 
  the 
  new 
  species, 
  showing 
  all 
  the 
  

   characters 
  very 
  clearly, 
  except 
  that 
  the 
  most 
  complete 
  one 
  is 
  dam- 
  

   aged 
  at 
  the 
  anal 
  side. 
  They 
  were 
  found 
  in 
  the 
  same 
  locality 
  and 
  

   horizon 
  with 
  the 
  type 
  of 
  Zeacrinus 
  girtyi, 
  hereinafter 
  described. 
  

  

  Horizon 
  and 
  Locality. 
  — 
  Upper 
  Carboniferous. 
  Morrow 
  forma- 
  

   tion 
  of 
  the 
  basal 
  Pennsylvanian 
  ; 
  near 
  Crittenden, 
  northeastern 
  

   Oklahoma. 
  

  

  ULRICHICRINUS 
  CORYPHAEUS 
  (S. 
  A. 
  Miller) 
  

  

  Plate 
  20, 
  fig. 
  3 
  

  

  Poteriocrinus 
  coryphaeus 
  S. 
  A. 
  Miller, 
  17th 
  Rep. 
  Geol. 
  Surv. 
  Indiana, 
  

  

  1891, 
  p. 
  44, 
  pi. 
  9, 
  fig. 
  1. 
  

   Keokuk 
  limestone 
  ; 
  Canton, 
  Indiana. 
  

  

  Abundant 
  at 
  Indian 
  creek, 
  Montgomery 
  county, 
  Indiana. 
  P. 
  

   orittsi 
  S. 
  A. 
  Miller,™ 
  from 
  Boonville, 
  Missouri, 
  may 
  be 
  identical 
  

   with 
  this, 
  and 
  if 
  so 
  would 
  take 
  the 
  species. 
  P. 
  amoenus 
  S. 
  A. 
  

   Miller, 
  47 
  is 
  only 
  a 
  small 
  specimen 
  of 
  P. 
  coryphaeus. 
  

  

  "Bull. 
  4, 
  Geol. 
  Surv. 
  Missouri, 
  p. 
  30. 
  

   47 
  17th 
  Rep. 
  Indiana, 
  p. 
  45, 
  pi. 
  9, 
  fig. 
  6. 
  

  

  