﻿146 
  Twenty-eighth 
  Bepokt 
  on 
  the 
  State 
  Museum. 
  

  

  sea-bottom, 
  is 
  one 
  of 
  the 
  best 
  evidences 
  of 
  the 
  extremely 
  quiet 
  

   condition 
  which 
  prevailed 
  during 
  the 
  slow 
  deposition 
  of 
  these 
  

   calcareous 
  shales 
  of 
  the 
  Niagara 
  Group. 
  

  

  STEPHANOCRINUS 
  Conrad. 
  

   Stephanoceinus 
  gemmifoemis. 
  

  

  Plate 
  14, 
  Figs. 
  15-20. 
  

   Compare 
  Stephanocrinus 
  gemmiformis 
  Hall. 
  Pal. 
  N. 
  Y., 
  vol. 
  ii, 
  p. 
  215, 
  pi. 
  48, 
  fig. 
  2. 
  

  

  The 
  details 
  of 
  the 
  structure 
  of 
  the 
  genus 
  Stephanoceijstus, 
  

   and 
  of 
  the 
  species 
  S. 
  gemmiformis, 
  are 
  given 
  in 
  vol. 
  2 
  of 
  

   Pal. 
  N. 
  Y., 
  as 
  cited 
  above. 
  The 
  specimens 
  figured 
  on 
  plate 
  

   14 
  of 
  this 
  Report 
  are 
  larger 
  and 
  more 
  rotund 
  than 
  those 
  usu- 
  

   ally 
  occurring 
  in 
  the 
  Niagara 
  shales 
  in 
  New 
  York, 
  but 
  other 
  

   specimens 
  from 
  later 
  collections 
  at 
  Waldron 
  are 
  of 
  smaller 
  

   dimensions, 
  and 
  show 
  a 
  range 
  of 
  variation 
  in 
  size 
  and 
  propor- 
  

   tions, 
  wnich 
  clearly 
  proves 
  the 
  identity 
  of 
  the 
  Western 
  forms 
  

   with 
  those 
  of 
  New 
  York. 
  

  

  The 
  structure 
  of 
  the 
  calyx 
  and 
  the 
  arrangement 
  of 
  parts 
  in 
  

   the 
  summit 
  and 
  ambulacra 
  appear 
  to 
  be 
  identical 
  with 
  Codas- 
  

   tee, 
  and 
  a 
  small 
  smooth 
  form 
  in 
  the 
  same 
  association, 
  re- 
  

   ferred 
  to 
  that 
  genus, 
  has 
  the 
  same 
  structure 
  as 
  the 
  fossil 
  under 
  

   consideration. 
  

  

  

   Stephanocrinus 
  gemmiformis. 
  

  

  CALOEOCRINUS 
  Hall. 
  

  

  Calceoceinus 
  Hall. 
  Pal. 
  N. 
  Y., 
  vol. 
  ii," 
  p. 
  352, 
  pi. 
  85, 
  figs. 
  5, 
  6. 
  1852. 
  

   Cheibocrinus 
  Hall. 
  13th 
  Eep. 
  St. 
  Cab. 
  Nat. 
  Hist., 
  p. 
  122. 
  1860. 
  

  

  At 
  the 
  time 
  the 
  genus 
  Cheieoceinus 
  was 
  proposed 
  for 
  this 
  

   form, 
  I 
  overlooked 
  the 
  fact 
  that 
  I 
  had 
  before 
  published 
  a 
  

   notice 
  of 
  the 
  fossil, 
  though 
  conscious 
  of 
  having 
  studied 
  it; 
  

   being 
  misled 
  by 
  the 
  absence 
  of 
  any 
  reference 
  in 
  the 
  index 
  of 
  

   vol. 
  ii, 
  Pal. 
  N. 
  Y., 
  the 
  description 
  being 
  under 
  the 
  head 
  of 
  

   Additions 
  and 
  Corrections. 
  

  

  