﻿2&1 
  PALEONTOLOGY 
  OF 
  ILLlNOi 
  

  

  PoTKl;luci;lM 
  s 
  BUBRAMUL0BU8, 
  Worthen. 
  

  

  PL 
  NXVII, 
  Hg. 
  6. 
  

  

  1882. 
  

   Ho. 
  I, 
  of 
  the 
  Illinois 
  State 
  Huseuin 
  • 
  p. 
  u. 
  

  

  Body 
  turbinate 
  or 
  obeonical. 
  higher 
  than 
  wide 
  to 
  the 
  top 
  ,.f 
  the 
  

   radial 
  Beries, 
  and 
  composed 
  of 
  very 
  thin, 
  smooth 
  plat' 
  

   trnneate 
  below, 
  about 
  as 
  high 
  as 
  wide, 
  and 
  forming 
  by 
  themse] 
  

   a 
  small 
  patagona] 
  cup 
  a 
  little 
  more 
  than 
  half 
  as 
  high 
  as 
  wid 
  

  

  Babradiala 
  about 
  twice 
  as 
  large 
  as 
  the 
  hasals, 
  four 
  i>f 
  them 
  hexag- 
  

   onal, 
  and 
  two 
  on 
  the 
  poeterior 
  side 
  larger 
  than 
  the 
  ethers 
  and 
  hi 
  

   (agonal. 
  Only 
  two 
  of 
  the 
  rays 
  are 
  preserved 
  in 
  the 
  specimen 
  bei 
  

   me, 
  and 
  in 
  one 
  of 
  these, 
  the 
  right 
  posterior 
  one. 
  the 
  radial 
  p] 
  

   appears 
  to 
  be 
  quadrangular, 
  and 
  rests 
  directly 
  upon 
  the 
  upper 
  mar- 
  

   gin 
  of 
  the 
  large 
  posterior 
  suhradial 
  below. 
  In 
  the 
  left 
  anterodateral 
  

   ray 
  the 
  radial 
  i- 
  pentangular, 
  its 
  lower 
  angle 
  fitting 
  in 
  between 
  two 
  

  

  of 
  the 
  Bubradials, 
  as 
  is 
  usually 
  the 
  ease 
  in 
  tin- 
  genus. 
  

  

  Brachials 
  two, 
  the 
  first 
  quadrangular, 
  and 
  the 
  second 
  pentangular, 
  

   both 
  wider 
  than 
  long, 
  and 
  the 
  last 
  supporting 
  on 
  its 
  slopirj 
  

  

  the 
  first 
  divisions 
  of 
  the 
  rays. 
  The 
  arms 
  in 
  the 
  right 
  posterior 
  ray 
  

   divide 
  again 
  two 
  or 
  three 
  times, 
  first 
  on 
  the 
  seventh 
  plate, 
  and 
  I 
  

   out.r 
  branch 
  twice 
  more 
  on 
  the 
  eighth 
  and 
  twentieth 
  plate, 
  and 
  I 
  

   inner 
  division 
  at 
  least 
  once 
  more 
  about 
  the 
  twentieth 
  plate, 
  mak 
  

   as 
  many 
  as 
  ten 
  arms 
  to 
  this 
  ray. 
  The 
  left 
  anterodateral 
  ray. 
  a! 
  

  

  firs! 
  division 
  on 
  the 
  la^t 
  brachial 
  plate, 
  gives 
  off 
  branches 
  in 
  

   eaoh 
  division 
  on 
  the 
  eighth 
  plate, 
  the 
  outer 
  division 
  dividing 
  tw 
  

   more 
  mi 
  the 
  eighth 
  ami 
  twenty-second 
  plate, 
  and 
  the 
  im 
  

   "iice 
  more 
  on 
  the 
  twenty-second 
  plate, 
  which 
  is 
  a- 
  far 
  as 
  the 
  arms 
  

  

  can 
  he 
  traced. 
  There 
  air 
  at 
  leasl 
  dn 
  arms 
  each 
  to 
  these 
  tv. 
  

  

  and 
  possibly 
  more. 
  Th< 
  anterior 
  ray 
  i> 
  hut 
  partially 
  exposed, 
  ai 
  

  

  •ii- 
  to 
  have 
  an 
  axillary 
  plate 
  about 
  the 
  twelfi 
  &OOV< 
  I 
  

  

  ■ 
  brachial. 
  The 
  first 
  anal 
  j 
  nearly 
  as 
  Is 
  

  

  Bubradial, 
  and 
  Intwecn 
  tw.- 
  of 
  them, 
  and 
  a 
  smaller 
  second 
  

  

  anal 
  rests 
  upon 
  the 
  first, 
  above 
  which 
  a 
  doubli 
  • 
  of 
  small 
  

  

  plat 
  i 
  that 
  probably 
  form 
  the 
  bast 
  >>f 
  ■ 
  

  

  Column 
  rather 
  stout, 
  the 
  first 
  plai 
  the 
  whole 
  (i 
  of 
  

  

  1 
  to 
  /■ 
  mum, 
  of 
  sleek 
  and 
  

  

  Worthen, 
  GeoL 
  Burv. 
  of 
  ill.. 
  Vol. 
  :>. 
  pa 
  . 
  r. 
  »« 
  > 
  . 
  pi. 
  n. 
  ii^. 
  3, 
  but 
  

  

  