﻿Plate 
  20 
  

  

  All 
  figures 
  excepl 
  '.', 
  natural 
  size 
  

  

  Page 
  

   ULRICHICRINUS 
  OKLAHOMA, 
  new 
  species 
  76 
  

  

  Fig. 
  1. 
  Posterior 
  view 
  of 
  principal 
  type, 
  showing 
  distribution 
  of 
  arms 
  

   and 
  pinnules, 
  form 
  of 
  brachials, 
  structure 
  of 
  stem, 
  and 
  relative- 
  

   size 
  of 
  anal 
  area. 
  

   2. 
  Anterior 
  view 
  of 
  another 
  complete 
  frown, 
  showing 
  structure 
  

   of 
  arms 
  and 
  pinnules, 
  and 
  form 
  and 
  proportions 
  of 
  calyx 
  

   plates. 
  

   2a. 
  Posterior 
  side 
  of 
  same, 
  showing 
  more 
  clearly 
  the 
  structure 
  of 
  

   tlie 
  anal 
  area, 
  and 
  the 
  narrowly 
  truncated 
  posterior 
  basal. 
  

   Pennsylvanian, 
  Morrow 
  formation; 
  Crittendon, 
  Oklahoma. 
  

  

  ULRICHICRINUS 
  CORYPHAEUS 
  (S. 
  A. 
  Miller) 
  __ 
  76 
  

  

  Fig. 
  3. 
  Posterior 
  view 
  of 
  crown, 
  for 
  comparison 
  with 
  preceding 
  

   species. 
  X 
  4. 
  

  

  Mississippian, 
  Keokuk 
  limestone: 
  Indian 
  crook. 
  Indiana. 
  

  

  127 
  

  

  