﻿MIT 
  9 
  UNUSUAL, 
  FORMS 
  OF 
  FOSSIL 
  CRINOIDS 
  SPRINGER 
  21 
  

  

  the 
  stem 
  from 
  its 
  original 
  attachment. 
  This 
  is 
  not 
  a 
  mere 
  casual 
  

   occurrence; 
  in 
  seven 
  specimens, 
  with 
  the 
  distal 
  end 
  preserved, 
  six 
  

   have 
  a 
  bulbous 
  termination, 
  and 
  the 
  seventh 
  is 
  irregularly 
  enlarged, 
  

   followed 
  by 
  a 
  short 
  tapering 
  appendix. 
  

  

  The 
  only 
  other 
  known 
  species 
  possessing 
  medially 
  swollen 
  cirri 
  is 
  

   II. 
  flabellicirrus 
  Bather, 
  from 
  Gotland, 
  in 
  which 
  they 
  are 
  thickly 
  

   crowded, 
  in 
  fan-like 
  clusters, 
  and 
  originate 
  at 
  the 
  back 
  side 
  of 
  the 
  

   stem. 
  

  

  The 
  material 
  available 
  for 
  this 
  investigation 
  consists 
  of 
  eight 
  spec- 
  

   imens 
  in 
  the 
  New 
  York 
  Museum 
  at 
  Albany, 
  most 
  obligingly 
  loaned 
  

   me 
  by 
  Dr. 
  John 
  M. 
  Clarke, 
  in 
  which 
  are 
  included 
  two 
  of 
  Hall's 
  

   types. 
  12 
  In 
  addition 
  to 
  these 
  I 
  have 
  had 
  the 
  use 
  of 
  some 
  fragments 
  

   from 
  a 
  different 
  locality 
  showing 
  the 
  full 
  rotundity 
  of 
  the 
  bulbous 
  

   distal 
  end, 
  for 
  which 
  I 
  am 
  indebted 
  to 
  the 
  courtesy 
  of 
  Prof. 
  Charles 
  

   Schuchert 
  of 
  the 
  Yale 
  University 
  Museum. 
  The 
  other 
  specimens 
  

   figured 
  by 
  Hall 
  I 
  have 
  not 
  been 
  able 
  to 
  locate. 
  One 
  of 
  them 
  13 
  has 
  

   about 
  10 
  cm. 
  of 
  the 
  stem, 
  with 
  the 
  curvature 
  toward 
  the 
  proximal 
  

   coil 
  well 
  shown, 
  but 
  not, 
  however, 
  either 
  the 
  proximal 
  or 
  distal 
  end. 
  

  

  I 
  see 
  no 
  reason 
  to 
  doubt 
  the 
  conclusion 
  reached 
  by 
  Bather 
  in 
  his 
  

   •discussion 
  of 
  1895 
  that, 
  this 
  species 
  is 
  congeneric 
  with 
  those 
  which 
  he 
  

   referred 
  to 
  Ilerpetocrinus. 
  The 
  difference 
  from 
  the 
  typical 
  forms 
  

   in 
  the 
  character 
  of 
  the 
  cirri 
  is 
  of 
  course 
  very 
  great, 
  but 
  not 
  relatively 
  

   more 
  than 
  that 
  of 
  some 
  of 
  the 
  other 
  species, 
  such 
  as 
  flabellicirrus 
  or 
  

   brackiatus, 
  while 
  the 
  general 
  type 
  of 
  stem 
  construction 
  remains 
  the 
  

   same. 
  

  

  Horizon 
  and 
  locality. 
  — 
  Lower 
  Devonian, 
  Helderbergian, 
  Xew 
  

   Scotland 
  formation; 
  Schoharie, 
  and 
  Helderberg 
  Mountains 
  in 
  Al- 
  

   bany 
  County, 
  New 
  York. 
  

  

  MYELODACTYLUS 
  SCHUCHERTI, 
  new 
  species 
  

  

  Plate 
  5, 
  figs. 
  9-9c. 
  

  

  Coil 
  apparently 
  of 
  the 
  close 
  variety; 
  circular 
  part 
  of 
  stem 
  long, 
  

   and 
  relatively 
  thick. 
  Cirri 
  round, 
  short, 
  tapering, 
  somewhat 
  irregu- 
  

   lar 
  in 
  size, 
  paired 
  on 
  successive 
  columnals, 
  which 
  in 
  the 
  cirrus- 
  

   bearing 
  part 
  are 
  uniformty 
  quadrangular, 
  with 
  straight 
  sides. 
  Crown 
  

   unknown. 
  

  

  Diameter 
  of 
  coil 
  as 
  preserved 
  about 
  15 
  mm. 
  Length 
  of 
  main 
  or 
  

   crescentic 
  portion 
  of 
  stem 
  remaining 
  about 
  40 
  mm. 
  ; 
  length 
  of 
  

   columnals 
  in 
  that 
  part 
  average 
  0.5 
  mm. 
  ; 
  width 
  at 
  place 
  of 
  fracture 
  

   4 
  mm., 
  diminishing 
  to 
  3 
  mm. 
  in 
  the 
  curve 
  next 
  to 
  the 
  neck, 
  and 
  

   then 
  to 
  2 
  mm. 
  in 
  the 
  proximal 
  neck, 
  which, 
  as 
  far 
  as 
  preserved, 
  is 
  

  

  u 
  Paleontology 
  of 
  New 
  York. 
  vol. 
  3, 
  pi. 
  5, 
  fig. 
  5 
  ; 
  pi. 
  6, 
  fig. 
  1. 
  

   13 
  Idem, 
  pi. 
  5, 
  fig. 
  7. 
  

  

  