﻿128 
  Twenty-eighth 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  plates 
  in 
  the 
  second 
  range 
  with 
  a 
  large 
  number 
  of 
  smaller 
  

   plates 
  above. 
  Inters 
  nprar 
  ad 
  ial 
  spaces 
  occupied 
  by 
  from 
  five 
  

   to 
  seven 
  plates 
  each, 
  which 
  gradually 
  decrease 
  in 
  size 
  from 
  

   below. 
  The 
  summit, 
  in 
  older 
  specimens, 
  is 
  depressed 
  con- 
  

   vex, 
  composed 
  of 
  a 
  large 
  number 
  of 
  polygonal 
  plates, 
  hav- 
  

   ing 
  near 
  the 
  anal 
  side 
  an 
  aperture 
  (or 
  proboscis 
  ?) 
  which 
  is 
  sur- 
  

   rounded 
  by 
  smaller 
  plates. 
  The 
  plates 
  of 
  the 
  radial 
  series 
  are 
  

   marked 
  along 
  their 
  centers 
  by 
  an 
  elevated 
  ridge, 
  which 
  is 
  in- 
  

   terrupted 
  at 
  the 
  sutures 
  of 
  the 
  first, 
  second, 
  and 
  third 
  radi- 
  

   als, 
  being 
  a 
  simple 
  elongate 
  node 
  on 
  the 
  first 
  radial, 
  becom- 
  

   ing 
  more 
  distinct 
  in 
  the 
  supraradial 
  series, 
  and 
  strongly 
  

   elevated 
  on 
  the 
  brachials 
  ; 
  bifurcating 
  on 
  the 
  fourth 
  plate 
  and 
  

   again 
  on 
  the 
  second 
  above, 
  with 
  two 
  or 
  three 
  plates 
  of 
  the 
  

   brachial 
  series 
  above 
  these, 
  before 
  the 
  separation 
  of 
  the 
  arms 
  

   from 
  the 
  body. 
  

  

  Surface, 
  in 
  well-preserved 
  specimens 
  of 
  the 
  plates, 
  toward 
  

   their 
  margins 
  (except 
  the 
  horizontal 
  faces 
  of 
  the 
  direct 
  radial 
  

   series), 
  marked 
  by 
  fine, 
  sharply 
  elevated 
  radiating 
  striae, 
  

   which 
  cross 
  the 
  suture 
  line 
  uniting 
  with 
  similar 
  ones 
  on 
  the 
  

   adjacent 
  plate 
  ; 
  there 
  are, 
  likewise, 
  sometimes, 
  short 
  ridges, 
  

   or 
  elongate 
  nodes, 
  radiating 
  from 
  near 
  the 
  margins 
  of 
  the 
  in- 
  

   terradial 
  plates 
  and 
  uniting 
  with 
  similar 
  ones 
  on 
  the 
  adjacent 
  

   plates. 
  All 
  the 
  plates 
  are 
  marked 
  by 
  a 
  finely 
  granulose 
  sur- 
  

   face, 
  the 
  granulae 
  being 
  arranged 
  in 
  concentric* 
  lines 
  parallel 
  

   to 
  the 
  margin 
  of 
  the 
  plates. 
  Column 
  enlarging 
  just 
  before 
  

   reaching 
  the 
  base 
  of 
  the 
  cup, 
  composed 
  of 
  very 
  thin 
  discs, 
  

   which 
  are 
  coarsely 
  granulose 
  on 
  their 
  margins. 
  

  

  This 
  species 
  has 
  some 
  resemblance 
  to 
  Actinocrinus 
  (Saccoc- 
  

   rinus) 
  speciosus 
  (Pal. 
  N. 
  Y., 
  vol. 
  ii., 
  p. 
  205, 
  pi. 
  46, 
  fig. 
  1), 
  but 
  

   diners 
  in 
  the 
  proportional 
  size 
  and 
  form 
  of 
  the 
  plates, 
  in 
  the 
  

   ridges 
  of 
  the 
  radial 
  series, 
  and 
  the 
  bifurcation 
  of 
  the 
  arms 
  

   previous 
  to 
  their 
  separation 
  from 
  the 
  body. 
  

  

  MACROSTYLOCRINUS 
  Rail. 
  

  

  In 
  the 
  second 
  volume 
  of 
  the 
  Palaeontology 
  of 
  New 
  York, 
  

   published 
  in 
  1852, 
  I 
  proposed 
  the 
  name 
  Macrostylocrinus 
  

   for 
  a 
  crinoid 
  having 
  three 
  basal 
  plates, 
  and 
  five 
  rays 
  of 
  three 
  

   plates 
  each, 
  from 
  which 
  proceed 
  the 
  arms 
  ; 
  the 
  interradial 
  

   series 
  consisting 
  of 
  about 
  five 
  plates. 
  In 
  1860, 
  Dr. 
  F. 
  Roemer 
  

  

  