﻿Plate 
  3 
  

   All 
  figures 
  not 
  otherwise 
  noted 
  natural 
  size 
  

   MYELODACTYLUS 
  EXTENSUS, 
  new 
  species 
  

  

  Fig. 
  1. 
  A 
  large 
  specimen 
  with 
  stem 
  extended 
  about 
  8 
  cm. 
  beyond 
  the 
  

   close 
  coil, 
  nearly 
  straight, 
  not 
  terminating 
  in 
  a 
  point. 
  Has 
  

   cirri 
  on 
  alternating, 
  cuneate 
  columnals. 
  

   ~[a. 
  Tbe 
  succession 
  of 
  columnals 
  — 
  var. 
  altemicirrus. 
  

  

  2. 
  Another 
  large 
  specimen 
  with 
  stem 
  extended 
  about 
  5 
  cm. 
  beyond 
  

  

  the 
  deviation 
  from 
  the 
  close 
  coil, 
  and 
  beginning 
  to 
  diminish 
  

   at 
  point 
  of 
  fracture: 
  the 
  proximal 
  reverse 
  curve 
  is 
  seen, 
  

   lias 
  paired 
  cirri 
  on 
  hour-glass 
  shaped 
  columnals. 
  

   '2ii. 
  The 
  succession 
  of 
  columnals 
  — 
  var. 
  bijugicirrus. 
  

  

  3. 
  Another 
  specimen 
  with 
  stem 
  extended 
  about 
  6.5 
  cm. 
  beyond 
  

  

  the 
  close 
  coil, 
  tapering 
  near 
  the 
  end 
  where 
  it 
  seems 
  to 
  termi- 
  

   nate 
  in 
  small 
  roots 
  of 
  radicular 
  cirri. 
  Has 
  paired 
  cirri. 
  

   3a. 
  The 
  succession 
  of 
  columnals 
  — 
  var. 
  bijugicirrus. 
  

   4. 
  4a. 
  A 
  small 
  specimen 
  with 
  some 
  alternating 
  cirri 
  in 
  place, 
  and 
  out- 
  

   line 
  showing 
  succession 
  of 
  columnals 
  — 
  var. 
  altemicirrus. 
  X 
  ■§. 
  

  

  5. 
  A 
  large 
  specimen 
  with 
  very 
  small 
  close 
  coil, 
  and 
  the 
  loose 
  coil. 
  

   partly 
  restored, 
  extended 
  for 
  aboul 
  1*2 
  cm. 
  beyond 
  the 
  place 
  

   of 
  deviation, 
  and 
  not 
  yet 
  terminated. 
  Parts 
  of 
  a 
  few 
  cirri 
  

   are 
  in 
  place. 
  Columnals 
  of 
  var. 
  bijugicirrus. 
  

  

  ('). 
  Smaller 
  specimen 
  with 
  much 
  of 
  extended 
  stem 
  broken 
  off. 
  

   Proximal 
  coil 
  is 
  seen, 
  with 
  reversed 
  curve 
  of 
  the 
  circular 
  

   neck, 
  followed 
  by 
  the 
  crown, 
  of 
  which 
  the 
  calyx 
  is 
  indistinct. 
  

   Columnals 
  of 
  var. 
  altemicirrus. 
  Xf. 
  

  

  7. 
  Large 
  specimen 
  with 
  incomplete 
  stem 
  for 
  about 
  7 
  cm. 
  beyond 
  

   close 
  coil. 
  Polished 
  section 
  obtained 
  by 
  grinding 
  down 
  to 
  

   the 
  axial 
  canal, 
  showing 
  the 
  proximal 
  coil, 
  neck, 
  and 
  crown 
  

   in 
  outline, 
  with 
  scattered 
  cirrals 
  in 
  some 
  places. 
  Columnals 
  

   of 
  var. 
  bijugicirrus. 
  

   8, 
  So. 
  Reverse 
  sides 
  of 
  a 
  specimen 
  with 
  only 
  the 
  close 
  coil 
  remaining, 
  

   having 
  the 
  cirri 
  complete, 
  converging 
  al 
  the 
  center. 
  Colum- 
  

   ns 
  is 
  of 
  var. 
  bijugicirrus. 
  

   9,10,11. 
  Three 
  small 
  specimens 
  with 
  stems 
  broken 
  off, 
  nol 
  far 
  beyond 
  

   the 
  close 
  coil. 
  All 
  of 
  var. 
  altemicirrus. 
  

  

  12. 
  Fragment 
  of 
  stem 
  from 
  St. 
  Paul. 
  Indiana, 
  showing 
  both 
  paired 
  

   and 
  alternate 
  cirri 
  in 
  the 
  same 
  specimen. 
  

  

  i:;. 
  A 
  specimen 
  from 
  the 
  Wenlockian 
  at 
  Dudley, 
  England, 
  with 
  

   paired 
  cirri 
  in 
  place 
  al 
  the 
  closed 
  coil, 
  and 
  stem 
  extended 
  far 
  

   beyond 
  that 
  region, 
  not 
  yel 
  diminishing 
  distalwards. 
  

   \;\n. 
  The 
  succession 
  of 
  columnals 
  —var. 
  bijiigicirrus. 
  

  

  All 
  except 
  12 
  and 
  13 
  are 
  from 
  the 
  Brownsporl 
  limestone. 
  

   Niagaran; 
  Decatur 
  County, 
  Tennessee. 
  

  

  102 
  

  

  