﻿NIAGARA 
  FALLS 
  AND 
  VICINITY 
  

  

  157 
  

  

  smaller 
  ones; 
  calyx 
  plates 
  finely 
  ornamented 
  by 
  granules, 
  which 
  

   become 
  elongated 
  near 
  the 
  margins 
  of 
  the 
  plates; 
  two 
  simple 
  disti- 
  

   chals 
  in 
  each 
  arm, 
  abruptly 
  followed 
  by 
  

   the 
  biserial 
  arm 
  plates. 
  

  

  Found 
  in 
  the 
  talus 
  of 
  the 
  weathered 
  

   Rochester 
  shale 
  above 
  Lewiston, 
  prob- 
  

   ably 
  from 
  the 
  thin 
  calcareous 
  beds 
  

   of 
  the 
  lower 
  part 
  of 
  the 
  shale. 
  Also 
  

   in 
  the 
  same 
  shale 
  at 
  Lockport 
  (Hall). 
  

  

  Glyptocrinus 
  plumosus 
  Hall 
  (Fig. 
  

   52) 
  (1852. 
  Pal 
  N. 
  Y. 
  2:180, 
  pi. 
  A41) 
  

  

  Under 
  this 
  name 
  Hall 
  has 
  figured 
  

   and 
  described 
  fragments 
  of 
  the 
  stem 
  

   and 
  arms 
  of 
  a 
  crinoid 
  from 
  the 
  Clin- 
  

   ton 
  beds 
  of 
  western 
  New 
  York, 
  which 
  

   he 
  states 
  is 
  extremely 
  rare 
  at 
  Niagara, 
  but 
  often 
  common 
  farther 
  

   east. 
  The 
  characteristics 
  of 
  these 
  fragments 
  are 
  shown 
  in 
  the 
  illus- 
  

   trations 
  here 
  reproduced. 
  

  

  Fig. 
  52 
  Glyptocrinus 
  plumosus 
  the 
  arm 
  

   pinnules 
  and 
  stem 
  with 
  an 
  enlargement 
  of 
  

   s'em 
  joints 
  

  

  Genus 
  eucalyptocrinus 
  Goldfuss 
  

  

  [Ety. 
  : 
  eo, 
  well; 
  xa/urrrc^v, 
  cover; 
  /cryj'yov 
  , 
  lily] 
  

  

  (1826. 
  Pctrc 
  facta 
  Gcrmaniac, 
  p. 
  212) 
  

  

  Calyx 
  with 
  a 
  deep 
  concavity 
  at 
  the 
  lower 
  end, 
  of 
  which 
  the 
  

   monocyclic 
  base 
  forms 
  the 
  bottom. 
  Calycinal 
  plates 
  having 
  

   throughout 
  a 
  pentameral 
  arrangement, 
  except 
  the 
  basals, 
  which 
  are 
  

   only 
  four 
  in 
  number. 
  Radials 
  in 
  contact 
  all 
  around, 
  costals 
  2x5, 
  

   distichals 
  2 
  x 
  10, 
  and 
  above 
  these 
  the 
  palmars 
  in 
  cycles 
  of 
  20, 
  and 
  of 
  

   small 
  size. 
  There 
  are 
  1x5 
  large 
  interradials, 
  above 
  which 
  are 
  two 
  

   narrow 
  and 
  elongate 
  interbrachials 
  placed 
  side 
  by 
  side. 
  Between 
  

   the 
  distichals 
  is 
  in 
  each 
  ray 
  one 
  interdistichal, 
  which 
  has 
  nearly 
  the 
  

   form 
  and 
  size 
  of 
  the 
  two 
  interbrachials 
  combined. 
  On 
  the 
  inter- 
  

   brachials 
  and 
  interdistichals 
  and 
  the 
  tegmen 
  rest 
  10 
  partitions, 
  which 
  

   extend 
  upward 
  and 
  form 
  compartments 
  which 
  contain 
  two 
  arms 
  

   each. 
  Arms 
  biserial, 
  composed 
  of 
  very 
  narrow 
  pieces. 
  A 
  proboscis 
  

   surmounts 
  the 
  tegmen 
  and 
  projects 
  above 
  the 
  arms. 
  Stem 
  round. 
  

  

  Eucalyptocrinus 
  decorus 
  (Phillips) 
  (Fig. 
  53) 
  (Hall. 
  1852. 
  Pal 
  

   N. 
  Y. 
  2:207, 
  pi. 
  47) 
  

  

  Distinguishing 
  characters. 
  Stem 
  consisting 
  of 
  alternating 
  thicker 
  

   and 
  thinner 
  joints, 
  the 
  former 
  wider 
  than 
  the 
  latter, 
  with 
  rounded 
  

  

  