﻿142 
  Twenty-eighth 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  each 
  upper 
  sloping 
  side 
  a 
  small 
  triangular 
  plate, 
  upon 
  which 
  

   rest 
  the 
  first 
  arm 
  plates. 
  The 
  interradial 
  plates 
  are 
  one 
  large 
  

   and 
  two 
  smaller 
  to 
  each 
  field 
  ; 
  the 
  large 
  one 
  is 
  ten- 
  sided 
  and 
  

   elongate-ovate, 
  its 
  greatest 
  width 
  above 
  the 
  middle 
  ; 
  the 
  others 
  

   are 
  nearly 
  as 
  long 
  but 
  narrow, 
  united 
  at 
  their 
  margins 
  the 
  

   entire 
  length, 
  greatest 
  width 
  below 
  the 
  middle, 
  the 
  summits 
  

   reaching 
  as 
  high 
  as 
  the 
  fourth 
  or 
  fifth 
  pair 
  of 
  arm 
  plates. 
  

   The 
  intersupraradial 
  plate 
  is 
  single, 
  having 
  the 
  form 
  of 
  the 
  

   two 
  upper 
  interradials 
  when 
  united, 
  but 
  smaller. 
  

  

  This 
  species 
  is 
  extremely 
  variable 
  in 
  form 
  and 
  proportions 
  

   of. 
  the 
  body, 
  the 
  older 
  specimens 
  being 
  often 
  more 
  elongate, 
  

   and 
  sometimes 
  constricted 
  near 
  the 
  middle 
  of 
  the 
  cup, 
  giving 
  

   a 
  concavity 
  to 
  the 
  sides. 
  The 
  base 
  is 
  much 
  broader 
  in 
  some 
  

   specimens, 
  giving 
  to 
  the 
  first 
  radials 
  a 
  greater 
  proportional 
  

   breath. 
  It 
  differs 
  from 
  the 
  E. 
  Icems 
  and 
  E. 
  Phillipsi 
  of 
  Troost, 
  

   in 
  the 
  much 
  greater 
  height 
  of 
  cup, 
  greater 
  elongation 
  of 
  

   plates, 
  and 
  in 
  having 
  a 
  less 
  proportion 
  of 
  the 
  first 
  radial 
  

   plates 
  within 
  the 
  basal 
  cavity. 
  

  

  A 
  measurement 
  of 
  the 
  calyx 
  in 
  some 
  of 
  the 
  larger 
  speci- 
  

   mens 
  gives 
  a 
  height 
  of 
  50 
  mm., 
  with 
  a 
  diameter 
  across 
  the 
  top 
  

   of 
  60 
  mm., 
  and 
  across 
  the 
  base 
  of 
  27 
  mm. 
  One 
  specimen 
  hav- 
  

   ing 
  a 
  height 
  of 
  50 
  mm., 
  has 
  a 
  diameter 
  at 
  the 
  base 
  of 
  23 
  mm. 
  

   One 
  individual 
  of 
  more 
  cylindrical 
  form 
  than 
  usual 
  has 
  a 
  

   height 
  of 
  30 
  mm. 
  with 
  a 
  diameter 
  of 
  the 
  calyx 
  at 
  the 
  summit 
  

   of 
  28 
  mm. 
  and 
  a 
  basal 
  diameter 
  of 
  16 
  mm. 
  The 
  figures 
  6, 
  7 
  

   and 
  8 
  of 
  plate 
  17, 
  and 
  figures 
  1, 
  2, 
  4 
  and 
  6 
  of 
  plate 
  18 
  are 
  

   good 
  illustrations 
  of 
  the 
  prevailing 
  forms 
  of 
  this 
  abundant 
  

   species. 
  

  

  EUCALYPTOCRINUS 
  CJELATTJS. 
  

   Plate 
  16, 
  Figs. 
  1-10 
  ; 
  Plate 
  19, 
  Figs. 
  1, 
  3. 
  

  

  Eucalyptocrinus 
  codatus 
  Hall. 
  Pal. 
  N. 
  Y., 
  vol. 
  ii, 
  p. 
  210, 
  pi. 
  47, 
  figs. 
  4a-4e. 
  1852. 
  

   E. 
  ccelatus 
  Hall. 
  Trans. 
  Alb. 
  Inst., 
  vol 
  iv, 
  p. 
  226. 
  Abstract, 
  p. 
  32; 
  May, 
  1863. 
  

   E. 
  cczlatus 
  Hall 
  . 
  20th 
  Rep. 
  St. 
  Cab. 
  Nat. 
  Hist., 
  pp. 
  321, 
  329. 
  Rev. 
  Edit., 
  pp. 
  363, 
  366. 
  

  

  Body 
  ovoid 
  ; 
  base 
  somewhat 
  broadly 
  truncate, 
  and 
  concave 
  

   for 
  the 
  attachment 
  of 
  the 
  column 
  ; 
  calyx 
  broadly 
  cyathiform, 
  

   shallow, 
  height 
  equal 
  to 
  one-third 
  of 
  the 
  entire 
  height 
  of 
  the 
  

   body. 
  Basal 
  plates 
  concealed 
  in 
  the 
  cavity 
  and 
  covered 
  by 
  

   the 
  summit 
  of 
  the 
  column. 
  Subradial 
  plates 
  strong, 
  gently 
  

   incurved 
  at 
  their 
  basal 
  margins 
  which 
  are 
  covered 
  by 
  the 
  col- 
  

   umn, 
  thence 
  expanding 
  outward 
  they 
  are 
  recurved 
  above 
  

   the 
  middle, 
  leaving 
  the 
  basal 
  margins 
  but 
  little 
  below 
  the 
  

   plane 
  of 
  the 
  upper 
  margins 
  of 
  the 
  same 
  plates. 
  Second 
  radial 
  

  

  