﻿Plate 
  7 
  

   All 
  figures 
  not 
  otherwise 
  noted 
  natural 
  size 
  

   CAMPTOCRINUS 
  PRAENUNTIUS. 
  new 
  species 
  

  

  Page 
  

   07 
  

  

  Fir,. 
  1. 
  A 
  nearly 
  complete 
  specimen, 
  with 
  scattered 
  cirri 
  ;il 
  irregular 
  

   intervals, 
  limited 
  to 
  the 
  distal 
  portion. 
  Natural 
  size. 
  

   Mississippian, 
  Burlington 
  limestone; 
  Burlington, 
  Iowa. 
  

  

  CAMPTOCRINUS 
  MYELODACTYLUS 
  Wachsmuth 
  and 
  Springer__ 
  28 
  

  

  Figs. 
  2.o. 
  Two 
  of 
  the 
  types 
  of 
  Wachsmuth 
  and 
  Springer 
  1 
  North 
  Amer. 
  

   Crin. 
  Cam., 
  pi. 
  75. 
  figs. 
  2a, 
  b,) 
  after 
  additional 
  cleaning; 
  they 
  

   show 
  the 
  doubled 
  nodal 
  columnals, 
  each 
  bearing 
  a 
  cluster 
  of 
  

   two. 
  three, 
  or 
  rarely 
  four, 
  rather 
  short 
  tapering 
  cirri 
  dimin- 
  

   ishing 
  in 
  size 
  inwards; 
  alternating 
  with 
  those 
  is 
  a 
  single 
  

   internodal, 
  nearly 
  the 
  length 
  of 
  the 
  pair; 
  occasionally 
  the 
  

   internodal 
  is 
  wanting, 
  or 
  the 
  cirri 
  limited 
  to 
  one. 
  The 
  cirrus 
  

   clusters 
  form 
  two 
  marginal 
  rows 
  at 
  the 
  inner 
  side 
  of 
  (lie 
  curve. 
  

   the 
  outermost 
  cirrus 
  being 
  so 
  much 
  larger 
  than 
  the 
  others 
  of 
  

   its 
  cluster 
  that 
  the 
  latter 
  often 
  cannot 
  l>e 
  seen 
  except 
  by 
  very 
  

   close 
  observation 
  after 
  careful 
  preparation. 
  X 
  -§. 
  

  

  It 
  should 
  be 
  noted 
  in 
  regard 
  to 
  these 
  and 
  all 
  the 
  figures 
  

   showing 
  the 
  marginal 
  cirri, 
  especially 
  the 
  detailed 
  sketches, 
  

   that 
  we 
  only 
  see 
  one 
  row. 
  that 
  upon 
  the 
  opposite 
  margin 
  

   being 
  omitted 
  in 
  the 
  sketches. 
  

   3a, 
  36. 
  Detail 
  from 
  the 
  original 
  of 
  figure 
  3, 
  including 
  I(i 
  cirri 
  counting 
  

   from 
  the 
  second 
  cirrus 
  next 
  10 
  the 
  broken 
  off 
  distal 
  end. 
  This 
  

   drawing 
  is 
  made 
  in 
  two 
  parts 
  for 
  convenience 
  in 
  mounting. 
  

   The 
  elliptic 
  outlines 
  in 
  this 
  and 
  similar 
  figures 
  give 
  the 
  cross 
  

   sections 
  from 
  measurements 
  at 
  the 
  part 
  of 
  the 
  stem 
  next 
  to 
  

   them. 
  Distal 
  is 
  to 
  the 
  r 
  -lit. 
  X 
  3. 
  

  

  3c. 
  Detail 
  from 
  the 
  same 
  specimen, 
  further 
  enlarged, 
  to 
  show 
  the 
  

   position 
  of 
  the 
  first 
  cirrus-facet 
  directly 
  over 
  the 
  suture 
  be- 
  

   tween 
  the 
  nodal 
  pair. 
  X 
  6. 
  

  

  3d. 
  Another 
  view 
  showing 
  the 
  mode 
  of 
  succession 
  of 
  the 
  cirri 
  fol- 
  

   lowing 
  the 
  first 
  cirrus 
  in 
  the 
  cluster. 
  X 
  6. 
  

  

  4. 
  A 
  specimen 
  with 
  the 
  stem 
  tapering 
  nearly 
  to 
  the 
  distal 
  end. 
  show 
  

  

  ing 
  the 
  crowded 
  condition 
  of 
  the 
  cirri 
  as 
  seen 
  unetdarged 
  : 
  in 
  

   this 
  and 
  the 
  next 
  figure 
  they 
  appear 
  as 
  if 
  chiefly 
  two 
  to 
  the 
  

   nodal, 
  but 
  the 
  smaller, 
  inner 
  cirri 
  are 
  mostly 
  crowded 
  inward 
  

   out 
  of 
  sight. 
  

  

  5. 
  The 
  largest 
  specimen, 
  the 
  only 
  one 
  showing 
  the 
  proximal 
  circu- 
  

  

  lar 
  part 
  of 
  the 
  stem: 
  it 
  also 
  shows 
  a 
  portion 
  of 
  the 
  calyx, 
  so 
  

   distorted 
  and 
  cracked 
  that 
  the 
  plates 
  can 
  not 
  he 
  definitely 
  

   shown. 
  The 
  stem 
  is 
  nearly 
  complete, 
  about 
  9 
  cm. 
  long 
  from 
  

   the 
  proximal 
  part 
  distalwards. 
  

  

  L'.:s.32— 
  2(3 
  8 
  107 
  

  

  