﻿INVEETEBEATES. 
  309 
  

  

  second 
  row 
  of 
  anal 
  plates 
  another 
  series 
  is 
  only 
  partly 
  visible. 
  Inter- 
  

   radials, 
  one 
  or 
  more 
  to 
  each 
  space, 
  but 
  their 
  form 
  and 
  number 
  can 
  

   not 
  be 
  clearly 
  determined 
  from 
  the 
  specimen 
  in 
  hand. 
  

  

  Column 
  round, 
  larger 
  at 
  its 
  junction 
  with 
  the 
  body 
  than 
  below, 
  

   and 
  composed 
  at 
  first 
  of 
  thin, 
  even 
  joints, 
  but 
  below 
  thicker 
  plates 
  

   are 
  intercalcated 
  at 
  irregular 
  intervals. 
  

  

  Position 
  and 
  locality: 
  Kinderhook 
  group 
  of 
  the 
  Lower 
  Carbon- 
  

   iferous 
  series, 
  Marsballtown, 
  Iowa. 
  

  

  Dedicated 
  to 
  Mr. 
  Thos. 
  Fletcher, 
  of 
  Keokuk, 
  Iowa, 
  to 
  whom 
  I 
  am 
  

   indebted 
  for 
  this 
  and 
  other 
  interesting 
  fossils. 
  

  

  The 
  author's 
  collection. 
  

  

  Genus 
  CYATHOCEINUS, 
  Miller. 
  

   Cyathockintjs 
  pabvibbachiatus, 
  Hall. 
  

  

  Pt. 
  XXVIII, 
  Fig. 
  5. 
  

  

  Cyathocrinus 
  parvibrachialus, 
  Hall, 
  1861. 
  Desc. 
  New 
  Crinoidea. 
  

  

  Cyathocrinus 
  Hamiltonensis, 
  Woethen, 
  February, 
  1882. 
  

  

  Bulletin 
  No. 
  1, 
  of 
  the 
  Illinois 
  State 
  Museum 
  of 
  Natural 
  History, 
  p. 
  32. 
  

  

  Body 
  of 
  medium 
  size, 
  basin-shaped, 
  base 
  deeply 
  impressed, 
  width 
  

   of 
  body 
  about 
  twice 
  as 
  great 
  as 
  the 
  height 
  to 
  the 
  top 
  of 
  the 
  first 
  

   radial 
  series. 
  Basals 
  small 
  and 
  concealed 
  in 
  the 
  basal 
  concavity 
  by 
  

   the 
  upper 
  joints 
  of 
  the 
  column. 
  

  

  Subradials 
  hexagonal, 
  counting 
  three 
  angles 
  on 
  the 
  under 
  side, 
  

   and 
  curve 
  into 
  the 
  basal 
  concavity 
  ; 
  width 
  and 
  length 
  nearly 
  equal 
  ; 
  

   slightly 
  convex, 
  the 
  greatest 
  convexity 
  being 
  a 
  little 
  below 
  the 
  center 
  

   of 
  the 
  plate. 
  

  

  Eadials 
  about 
  twice 
  as 
  wide 
  as 
  long, 
  those 
  on 
  the 
  anterior 
  side 
  

   pentagonal, 
  the 
  articulating 
  facet 
  for 
  the 
  reception 
  of 
  the 
  brachials 
  

   occupying 
  about 
  one-half 
  the 
  width 
  of 
  the 
  plate. 
  In 
  the 
  anterior 
  

   ray 
  the 
  first 
  bifurcation 
  takes 
  place 
  on 
  the 
  fourth 
  brachial, 
  and 
  in 
  

   one 
  of 
  the 
  antero-lateral 
  rays 
  on 
  the 
  third, 
  and 
  a 
  second 
  bifurcation 
  

   on 
  each 
  division 
  of 
  this 
  ray 
  takes 
  place 
  on 
  the 
  third 
  plate 
  above 
  the 
  

   first. 
  The 
  arms 
  diminish 
  rapidly 
  in 
  size 
  beyond 
  the 
  first 
  bifurca- 
  

   tion. 
  Anal 
  side 
  unknown. 
  

  

  