﻿108 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.67 
  

  

  Page 
  

   Fie:. 
  5u. 
  Elliptic 
  section 
  of 
  stem, 
  measured 
  at 
  the 
  widest 
  part 
  at 
  right 
  28 
  

   side 
  about 
  opposite 
  the 
  calyx. 
  X 
  5. 
  

   56. 
  Section 
  measured 
  at 
  about 
  8 
  internodes 
  from 
  distal 
  end. 
  where 
  

   stem 
  becomes 
  nearly 
  circular. 
  X 
  5. 
  

  

  All 
  Keokuk 
  limestone, 
  Mississippian 
  : 
  Indian 
  Creek, 
  Indiana. 
  

  

  CAMPTOCBJNUS 
  PLENICIRRUS, 
  new 
  species 
  30 
  

  

  Fig. 
  6. 
  Specimen 
  with 
  crown 
  complete 
  ; 
  the 
  stem 
  having 
  the 
  character- 
  

   isiic 
  curves 
  and 
  elliptic 
  section 
  of 
  the 
  preceding 
  species, 
  lint 
  

   the 
  cirri, 
  instead 
  of 
  being 
  limited 
  to 
  two 
  marginal 
  rows 
  of 
  

   clusters, 
  are 
  distributed 
  as 
  normally 
  in 
  regular 
  whorls 
  of 
  

   nearly 
  uniform 
  size. 
  

   6a. 
  Detail 
  of 
  stem 
  of 
  same 
  specimen, 
  with 
  some 
  cirri 
  restored 
  from 
  

   the 
  stumps 
  where 
  the 
  dimensions 
  are 
  evident. 
  This 
  should 
  

   be 
  compared 
  with 
  the 
  figures 
  on 
  plate 
  8 
  showing 
  whorls 
  of 
  

   dwarfed 
  cirri. 
  X 
  3. 
  

  

  Mississippian. 
  Keokuk 
  limestone; 
  Crawiordsville, 
  Indiana. 
  

  

  