﻿100 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.67 
  

  

  Fig. 
  Qb. 
  The 
  succession 
  of 
  columnals 
  — 
  var. 
  alternicirrus. 
  10 
  

  

  7. 
  In. 
  Similar 
  views 
  of 
  a 
  fractured 
  specimen 
  of 
  same 
  type, 
  showing 
  

   form 
  and 
  proportions 
  of 
  first 
  cirrals 
  on 
  three 
  successive 
  

   coils 
  — 
  var. 
  alternicirrus. 
  

   S. 
  Remnant 
  of 
  a 
  fractured 
  specimen 
  associated 
  with 
  the 
  two 
  pre- 
  

   ceding 
  in 
  the 
  same 
  layer, 
  having 
  paired 
  cirri 
  — 
  var. 
  bijugi- 
  

   cirrusj 
  a 
  portion 
  of 
  the 
  circular 
  neck 
  and 
  of 
  the 
  crown 
  are 
  

   visible. 
  X 
  f. 
  

   9. 
  The 
  tapering 
  distal 
  end 
  only 
  of 
  a 
  stem 
  with 
  extremely 
  slender 
  

   termination. 
  X 
  f. 
  

  

  The 
  last 
  four 
  specimens 
  (6-9) 
  are 
  from 
  the 
  Waldron 
  shale. 
  

   Niagaran; 
  Newsom, 
  Tennessee. 
  

  

  