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  PLATE 
  XXIII. 
  

  

  Page. 
  

  

  C 
  ten 
  acanthis 
  Hakuiboni, 
  St. 
  J. 
  and 
  W 
  . 
  

  

  Fig. 
  1 
  ". 
  Vlewol 
  right 
  side 
  of 
  spine, 
  outline 
  partinll> 
  : 
  1 
  b, 
  do., 
  froni 
  the 
  

  

  dorsal 
  edge; 
  1 
  o, 
  do., 
  posterior 
  fnoe: 
  1 
  >tlons 
  at 
  broken 
  distal 
  

  

  end. 
  at 
  opening 
  ol 
  pulp 
  cavity, 
  and 
  the 
  inferior 
  dorsal 
  angle. 
  St. 
  Lot) 
  

   Alton. 
  Mr. 
  St. 
  John. 
  

  

  LlNEMACASTHls 
  COSTATU8, 
  (N. 
  Uli'l 
  W. 
  BP.) 
  

  

  - 
  a. 
  Side 
  view 
  of 
  spine. 
  somewhal 
  distorted, 
  and 
  showing 
  In 
  consequence 
  nearly 
  

   the 
  entire 
  breadth 
  of 
  the 
  dorsal 
  ridge 
  towards 
  thi 
  - 
  - 
  . 
  do., 
  view 
  of 
  

   the 
  dorsal 
  angle: 
  - 
  wing 
  posterior 
  face, 
  with 
  the 
  later, 
  

  

  crushed 
  together 
  below; 
  9 
  '/, 
  do., 
  transverse 
  sections 
  just 
  below 
  middle 
  

   and 
  near 
  tip. 
  . 
  Alton, 
  111.. 
  Mr. 
  But:- 
  

  

  