﻿EXPLANATION 
  OF 
  PLATES 
  

  

  Enlargement, 
  if 
  any, 
  of 
  the 
  drawings 
  is 
  indicated 
  by 
  the 
  sign 
  at 
  the 
  end 
  of 
  

   the 
  paragraph. 
  Unless 
  so 
  noted 
  the 
  figure 
  is 
  of 
  natural 
  size. 
  All 
  the 
  speci- 
  

   mens 
  figured, 
  except 
  as 
  otherwise 
  suited, 
  are 
  in 
  the 
  author's 
  collection, 
  now 
  

   in 
  the 
  United 
  States 
  National 
  Museum. 
  

  

  Plate 
  1 
  

  

  All 
  figures 
  not 
  otherwise 
  noted 
  natural 
  size 
  

  

  Page 
  

   MYELODACTYLUS 
  CONVOLTJTUS 
  Hall 
  8 
  

  

  Fig. 
  1. 
  A 
  very 
  large 
  specimen, 
  with 
  broadly 
  curved 
  stem 
  beyond 
  the 
  

  

  proximal 
  coil, 
  showing 
  the 
  closely 
  packed 
  cirri 
  paired 
  on 
  suc- 
  

   cessive 
  parallel 
  columnals 
  in 
  the 
  bilateral 
  part, 
  some 
  til' 
  the 
  

   noncirriferous 
  proximal 
  coil 
  with 
  circular 
  neck 
  leading 
  to 
  

   the 
  crown, 
  which 
  is 
  imperfectly 
  exposed 
  from 
  beneath 
  the 
  

   enveloping 
  cirri. 
  

  

  2. 
  Another 
  specimen, 
  with 
  stem 
  broken 
  off 
  beyond 
  the 
  close 
  coil. 
  

  

  and 
  a 
  few 
  cirrals 
  and 
  part 
  of 
  the 
  neck 
  exposed. 
  X 
  f. 
  

  

  3. 
  Another 
  typical, 
  hut 
  smaller 
  specimen, 
  with 
  much 
  id' 
  the 
  broad 
  

  

  curve 
  intact, 
  and 
  cirri 
  converging 
  at 
  center 
  of 
  close 
  coil 
  com- 
  

   pletely 
  enveloping 
  the 
  crown. 
  

  

  4. 
  Fragment 
  of 
  bilateral 
  part 
  of 
  stem 
  seen 
  from 
  the 
  outer 
  side 
  of 
  

  

  curve, 
  showing 
  the 
  longitudinal 
  sutures. 
  X 
  f. 
  

  

  5. 
  Another 
  fragment 
  from 
  inner 
  side 
  of 
  curve, 
  showing 
  the 
  cirrus- 
  

  

  facers 
  at 
  each 
  end 
  of 
  successive 
  columnals. 
  X 
  §. 
  

  

  6. 
  Joint-face 
  of 
  a 
  columnal 
  from 
  median 
  bilateral 
  part 
  of 
  stem. 
  

  

  X 
  |. 
  

  

  7. 
  Specimem 
  from 
  Laurel 
  limestone. 
  St. 
  Paul, 
  hid.: 
  showing 
  close 
  

  

  coil 
  and 
  beginning 
  of 
  broad 
  curve 
  of 
  stem. 
  Cirri 
  not 
  pre- 
  

   served, 
  but 
  their 
  facets 
  are 
  to 
  be 
  seen 
  like 
  those 
  in 
  the 
  frag- 
  

   ment 
  following. 
  

   S. 
  Fragment 
  from 
  same 
  locality, 
  seen 
  from 
  inner 
  side 
  of 
  curve, 
  with 
  

   cirrus-facets 
  on 
  each 
  columnal. 
  X 
  f 
  . 
  

  

  All 
  except 
  7 
  and 
  8 
  are 
  from 
  the 
  Rochester 
  shale, 
  Niagaran; 
  

   Lockport, 
  New 
  York. 
  

  

  MYELODACTYLUS 
  BREVIS. 
  new 
  species 
  .__ 
  10 
  

  

  Fig. 
  9. 
  The 
  only 
  specimen; 
  a 
  nearly 
  complete 
  coil 
  tapering 
  to 
  the 
  dis- 
  

   tal 
  end, 
  with 
  cirri 
  paired 
  on 
  each 
  columnal 
  ami 
  converg- 
  

   ing 
  to 
  the 
  center. 
  X 
  f 
  . 
  

   9a. 
  Distal 
  outer 
  view 
  of 
  same, 
  showing 
  taper 
  almost 
  to 
  the 
  

   end. 
  X 
  f 
  . 
  

  

  Niagaran, 
  Brownsport 
  limestone: 
  Decatur 
  County. 
  Ten- 
  

   nessee. 
  

   u:;s::u 
  26^—7 
  97 
  

  

  