﻿Plate 
  12 
  

   All 
  figures 
  natural 
  size 
  unless 
  otherwise 
  stated 
  

  

  ACROCRINUS 
  PRAECURSOR. 
  new 
  species 
  42 
  

  

  Fig. 
  1. 
  Posterior 
  view 
  of 
  calyx 
  and 
  part 
  of 
  arms, 
  both 
  somewhat 
  dis- 
  

   placed 
  by 
  pressure, 
  showing 
  numerous 
  ranges 
  of 
  irregular 
  

   plates 
  between 
  BE 
  and 
  PR. 
  

  

  Upper 
  Burlington 
  limestone; 
  Burlington, 
  lown. 
  

  

  ACROCRINUS 
  INTERMEDIUS. 
  now 
  species 
  13 
  

  

  Fig. 
  2. 
  A 
  complete 
  crown 
  with 
  loug 
  stem; 
  r. 
  post, 
  view, 
  showing 
  erect, 
  

   biserial 
  anus 
  and 
  pinnules, 
  and 
  the 
  anal 
  series 
  with 
  pyramid 
  

   of 
  small 
  plates 
  surmounting 
  it. 
  Has 
  o 
  ranges 
  of 
  plates 
  be- 
  

   tween 
  PP. 
  and 
  KB. 
  X 
  2. 
  

   1!'/. 
  Diagram 
  of 
  calyx 
  of 
  same: 
  drawn 
  front 
  the 
  posterior 
  side, 
  giving 
  

   the 
  complete 
  succession 
  of 
  anal 
  plates. 
  

  

  3. 
  Similar 
  view 
  of 
  a 
  detached 
  calyx 
  having 
  2 
  and 
  .". 
  ranges 
  of 
  supple- 
  

  

  mental 
  plates 
  interposed. 
  X 
  2. 
  

  

  4. 
  Bight 
  anterior 
  view 
  of 
  calyx 
  of 
  another 
  specimen 
  with 
  2 
  ranges 
  

  

  of 
  plates 
  interposed. 
  X 
  2. 
  

   5. 
  Anterior 
  view 
  of 
  a 
  nearly 
  complete 
  crown 
  and 
  stem, 
  with 
  2 
  ranges 
  

   of 
  plates 
  interposed; 
  natural 
  size. 
  

  

  Lower 
  Chester: 
  Monroe 
  County. 
  Illinois. 
  

  

  ACROCRINUS 
  SHUMARDI 
  Yandell 
  41,44,45 
  

  

  Fig. 
  (J. 
  A 
  complete 
  crown, 
  with 
  arms 
  erect. 
  Grayson 
  Springs. 
  

  

  7. 
  Lower 
  pari 
  of 
  calyx. 
  After 
  Wachsmuth 
  and 
  Springer. 
  Sloan's 
  

   Valley, 
  Pulaski 
  County. 
  X 
  2. 
  

  

  Upper 
  Chester, 
  Glen 
  Dean 
  formation; 
  Kentucky. 
  

  

  ACROCRINUS 
  AMPHORA 
  Wachsmuth 
  and 
  Springer__ 
  . 
  40,44,45 
  

  

  Fig. 
  8. 
  A 
  specimen 
  from 
  Huntsville, 
  to 
  show 
  relation 
  of 
  bas>e, 
  calyx 
  with 
  

   supplementary 
  plates, 
  and 
  recumbent 
  arms. 
  

   9. 
  A 
  complete 
  calyx 
  without 
  the 
  arms, 
  to 
  show 
  the 
  arrangement 
  of 
  

   plates 
  Same 
  locality. 
  After 
  Wachsmuth 
  and 
  Springer. 
  X 
  f. 
  

   Lower 
  Chester, 
  Ohara 
  formation; 
  Huntsville, 
  Alabama. 
  

  

  ACROCRINUS 
  WORTHENI 
  Wachsmuth 
  ■ 
  to 
  

  

  FlG. 
  10. 
  Outline 
  of 
  the 
  calyx, 
  to 
  show 
  relative 
  size 
  After 
  Wachsmuth 
  

   and 
  Springer. 
  

   Lower 
  Coal 
  Measures; 
  Peoria 
  County. 
  Illinois. 
  

  

  1 
  1 
  5 
  

  

  