﻿CHONDKOSTEID^. 
  

  

  41 
  

  

  P. 
  3356 
  m. 
  Series 
  of 
  vertebral 
  arches, 
  each 
  with 
  a 
  posterior 
  ex- 
  

   pansion 
  at 
  the 
  base 
  and 
  a 
  truncated 
  distal 
  end 
  which 
  

   seems 
  to 
  have 
  been 
  originally 
  invested 
  with 
  cartilage. 
  

   The 
  fossil 
  probably 
  represents 
  the 
  haemal 
  arches 
  of 
  

   Gyrosteus 
  mirdbilis 
  in 
  the 
  region 
  of 
  the 
  caudal 
  fin. 
  

  

  EnnisTcillen 
  Coll. 
  

  

  P. 
  3356 
  b. 
  Right 
  supraclavicle, 
  shown 
  of 
  one-sixth 
  the 
  natural 
  size, 
  

   from 
  the 
  inner 
  aspect, 
  in 
  fig. 
  16, 
  figured 
  loc. 
  cit. 
  p. 
  34, 
  

   fig. 
  6. 
  Enniskillen 
  Coll. 
  

  

  P. 
  3356 
  c. 
  Portion 
  of 
  caudal 
  fin 
  displayed 
  in 
  irregular 
  section, 
  

   shown 
  of 
  one-third 
  the 
  natural 
  size 
  in 
  fig. 
  17, 
  described 
  

   and 
  figured 
  loc. 
  cit. 
  pp. 
  35, 
  36, 
  fig. 
  7. 
  The 
  stout, 
  closely- 
  

   articulated 
  and 
  distally-bifurcating 
  rays 
  are 
  well 
  exhi- 
  

   bited. 
  EnnisTcillen 
  Coll. 
  

  

  rig. 
  17. 
  

  

  Caudal 
  fin-rays 
  of 
  Gyrosteus 
  mirabilis 
  ; 
  one-third 
  nat. 
  size. 
  [No. 
  P. 
  3356 
  c] 
  

  

  