﻿138 
  Twenty-eighth 
  Eeport 
  ok 
  the 
  State 
  Museum. 
  

  

  ing 
  cylindrical 
  above, 
  angular 
  above 
  the 
  base 
  by 
  the 
  promi- 
  

   nence 
  of 
  the 
  radial 
  series 
  ; 
  base 
  truncate 
  for 
  the 
  articulation 
  

   of 
  the 
  rather 
  large 
  column. 
  Basal 
  plates 
  rudimentary, 
  con- 
  

   cealed 
  by 
  the 
  column. 
  Subradial 
  plates 
  appearing 
  pentangu- 
  

   lar 
  from 
  their 
  junction 
  with 
  the 
  column, 
  somewhat 
  higher 
  

   than 
  wide. 
  The 
  primary 
  radial 
  series 
  consists 
  of 
  three 
  plates 
  

   each 
  ; 
  the 
  first 
  one 
  pentangular, 
  with 
  the 
  upper 
  angles 
  slightly 
  

   truncated 
  ; 
  the 
  second 
  quadrangular 
  ; 
  the 
  third 
  pentangular, 
  

   supporting 
  on 
  its 
  upper 
  sides 
  the 
  first 
  plates 
  of 
  the 
  second 
  

   radial 
  series. 
  The 
  second 
  radial 
  series 
  consists 
  of 
  ten 
  ranges 
  

   of. 
  rectangular 
  plates, 
  four 
  to 
  live 
  in 
  each 
  range. 
  The 
  third 
  

   radial 
  series 
  is 
  composed 
  of 
  twenty 
  ranges 
  of 
  narrow 
  rectan- 
  

   gular 
  plates, 
  seven 
  to 
  twelve 
  in 
  each 
  range. 
  The 
  fourth 
  radial 
  

   series 
  consists 
  of 
  forty 
  ranges 
  of 
  similar 
  plates, 
  the 
  number 
  

   not 
  having 
  been 
  observed 
  ; 
  but 
  no 
  evidence 
  of 
  free 
  arms 
  is 
  

   shown 
  up 
  to 
  the 
  eighth 
  plate 
  of 
  the 
  fourth 
  series. 
  No 
  inter- 
  

   radial 
  plates 
  have 
  been 
  observed. 
  The 
  plates 
  are 
  all 
  emargin- 
  

   ate 
  at 
  the 
  center 
  of 
  the 
  upper 
  margins 
  and 
  correspondingly 
  

   produced 
  on 
  the 
  lower 
  side, 
  except 
  the 
  upper 
  plate 
  of 
  each 
  

   range 
  which 
  is 
  produced 
  at 
  both 
  margins. 
  

  

  Surface 
  of 
  the 
  radial 
  plates 
  elevated 
  in 
  the 
  center 
  ; 
  entirely 
  

   smooth. 
  

  

  This 
  character 
  of 
  the 
  species, 
  in 
  the 
  emargination 
  of 
  its 
  

   plates, 
  corresponds 
  with 
  that 
  of 
  the 
  small 
  patelloid 
  plates 
  of 
  

   Forbesiocrinus, 
  and 
  in 
  most 
  respects 
  it 
  resembles 
  that 
  genus, 
  

   except 
  in 
  the 
  absence 
  of 
  interradial 
  plates. 
  This 
  species 
  dif- 
  

   fers 
  from 
  any 
  other 
  of 
  the 
  genus 
  before 
  described, 
  in 
  the 
  nar- 
  

   rowly 
  turbinate 
  form 
  of 
  the 
  cup, 
  the 
  subangular 
  outline 
  of 
  

   the 
  basal 
  portion, 
  and 
  the 
  elongate 
  cylindrical 
  form 
  of 
  the 
  

   upper 
  part. 
  

  

  MELOCRINUS 
  Goldfuss. 
  

   Melocrinus 
  obconicus. 
  

  

  Plate 
  14, 
  Figs. 
  11-14. 
  

  

  Melocrinus 
  obconicufi 
  Hall.. 
  Trans. 
  Alb. 
  Inst., 
  vol. 
  iv, 
  p. 
  206. 
  Abstract, 
  p. 
  12; 
  

   May, 
  1863. 
  

  

  Body 
  narrowly 
  subturbinate 
  or 
  ob 
  conical 
  ; 
  basal 
  plates 
  

   forming 
  together 
  an 
  elongate 
  quadrangular 
  prominence 
  which 
  

   scarcely 
  expands 
  above, 
  and 
  from 
  which 
  the 
  body 
  gradually 
  

  

  