﻿PLATE 
  XXII. 
  

  

  Taoe 
  

  

  Ctenacanthus 
  deflexvs. 
  St. 
  J. 
  find 
  W 
  

  

  1 
  _-. 
  1 
  a. 
  Side-view 
  of 
  spine, 
  outline 
  partially 
  restored: 
  1 
  >>. 
  do.. 
  showing 
  the 
  anterior 
  

   edge: 
  1 
  0, 
  do., 
  posterior 
  faoe; 
  1 
  </. 
  ., 
  d 
  ns 
  near 
  the 
  

  

  inferior 
  nngle 
  of 
  the 
  posterior 
  faee 
  and 
  near 
  the 
  broken 
  upper 
  extremity. 
  

   St. 
  Louis: 
  Alton. 
  III., 
  Mr. 
  Alex, 
  butters. 
  

  

  ('TEN 
  - 
  ACANTHUS 
  BlTTEKSI, 
  St. 
  J. 
  allfl 
  \Y 
  24" 
  

  

  .' 
  a. 
  Dorsal 
  view 
  of 
  epino; 
  - 
  b, 
  do., 
  view 
  of 
  rig] 
  do., 
  showing 
  posterior 
  

  

  faee; 
  2 
  J. 
  do., 
  cross 
  sections 
  from 
  the 
  middle 
  and 
  near 
  the 
  extremll 
  ■ 
  

   1 
  • 
  . 
  do., 
  enlargement 
  showing 
  tabereulated 
  oottai 
  in 
  the 
  basal 
  angle 
  in 
  

   front, 
  somewhat 
  worn. 
  Lower 
  Ooal 
  M 
  .inville. 
  

  

  111.. 
  Mr. 
  Butt. 
  

  

  