﻿Ms 
  PAL.EONTOLOf.Y 
  OF 
  ILLIV 
  

  

  y 
  further 
  use 
  the 
  term 
  for 
  the 
  upper 
  iron 
  

  

  regions 
  of 
  the 
  body, 
  and 
  they 
  inch, 
  in 
  the 
  ambulacra. 
  

  

  It 
  1 
  1 
  by 
  Mi-. 
  I. 
  otucky 
  II. 
  p. 
  Vol. 
  III. 
  

  

  p. 
  168), 
  that 
  in 
  the 
  and 
  /'• 
  the 
  plates, 
  gen- 
  

  

  erally 
  known 
  us 
  basals, 
  consisted 
  of 
  two 
  si. 
  

   ami 
  upon 
  this 
  ground 
  he 
  proposed 
  a 
  new 
  formula 
  for 
  the 
  two 
  gei 
  

   Only 
  to 
  the 
  "low 
  be 
  applied 
  the 
  term 
  basals, 
  the 
  

  

  "upper 
  series" 
  he 
  called 
  first 
  radials. 
  II. 
  . 
  - 
  v 
  j 
  ■ 
  ] 
  : 
  t 
  i 
  i 
  

   from 
  five 
  to 
  three 
  in 
  the 
  number 
  of 
  the 
  latter 
  plates, 
  and 
  the 
  in 
  

   larity 
  which 
  he 
  found 
  in 
  their 
  form 
  and 
  p 
  compared 
  with 
  

  

  other 
  radials. 
  that 
  the 
  two 
  equal 
  hexagonal 
  

   plates, 
  and 
  the 
  third 
  smaller 
  pentagonal 
  one. 
  imperfect 
  rding 
  

  

  to 
  his 
  theory, 
  there 
  were 
  no 
  first 
  radials 
  in 
  two 
  of 
  the 
  rays, 
  and 
  the 
  

  

  commenced 
  with 
  a 
  second 
  radial. 
  This 
  curious 
  interpretation 
  

   of 
  the 
  plates, 
  as 
  might 
  he 
  expected, 
  found 
  no 
  followers, 
  bul 
  

   that 
  in 
  some 
  of 
  the 
  Blastoids 
  the 
  plates 
  formerly 
  called 
  bae 
  

   composed 
  of 
  two 
  series 
  of 
  tin- 
  . 
  ach, 
  was 
  aft 
  

  

  by 
  Billings 
  (Amer. 
  Journ. 
  Bci. 
  and 
  Arts, 
  July, 
  1869), 
  and 
  

  

  ; 
  and 
  Worthen 
  (Geol. 
  Rep. 
  III.. 
  Vol. 
  V. 
  p. 
  \&i 
  . 
  r; 
  

   "lower 
  pit 
  a 
  basals. 
  the 
  "uppt 
  

  

  radials: 
  while 
  Meek 
  and 
  Worthen 
  in 
  redescribing 
  ' 
  ritnu 
  

  

  (CodonUee) 
  eteUiformi 
  3hum., 
  distinguished 
  th< 
  

  

  isals 
  and 
  supplementary 
  basals, 
  the 
  Latter 
  to 
  be 
  applied 
  to 
  the 
  

   ••low. 
  ." 
  They 
  ol 
  i 
  thi 
  nam. 
  Bubradials 
  from 
  tin 
  

  

  that 
  the 
  plates 
  do 
  not 
  alternate 
  with 
  each 
  other. 
  In 
  tl 
  

   their 
  remarks 
  they 
  mad.' 
  the 
  peculiar 
  aent, 
  that 
  the 
  I 
  

  

  - 
  or 
  supplementary 
  basals 
  "wen 
  in 
  <i<l«lt 
  >■; 
  

   ateUiformie 
  ae 
  solid 
  <»»• 
  we 
  find 
  them 
  in 
  Pentremitee, 
  young 
  individuate, 
  

  

  er, 
  show 
  clearly 
  that 
  then 
  <irc 
  actually 
  eotnp 
  

   the 
  upper 
  joints 
  of 
  the 
  column, 
  enlarged 
  <m<l 
  anchylo* 
  

   Meek 
  and 
  Worthen 
  undertook 
  to 
  pn 
  by 
  a 
  modi 
  imall 
  

  

  specimen, 
  in 
  which 
  * 
  aii 
  joints 
  of 
  the 
  column 
  wi 
  rved, 
  

  

  and 
  in 
  ti 
  m 
  divided 
  Longitudinally 
  into 
  tl 
  

  

  It 
  should 
  be 
  Btated 
  thai 
  the 
  specimen, 
  whioh 
  ■ 
  . 
  my 
  

  

  collection 
  now 
  in 
  the 
  Museum 
  of 
  Compai 
  .'oology 
  nt 
  ( 
  

  

  bridge 
  is 
  not 
  muoh 
  below 
  medium 
  Bue, 
  and. 
  tl 
  

   any 
  meat 
  lied 
  a 
  verj 
  men. 
  The 
  column. 
  

  

  rkably 
  

  

  joints 
  with 
  shai| 
  and 
  the 
  joil 
  

  

  the 
  longitudinal 
  buI 
  !y. 
  bul 
  p 
  

  

  ably 
  do 
  < 
  ds1 
  in 
  tie 
  n. 
  

  

  