﻿458 
  ACTINOPTERYGII. 
  

  

  notochordal 
  sheath 
  are 
  obscurely 
  indicated, 
  and 
  the 
  

   delicate 
  ribs 
  in 
  the 
  abdominal 
  region 
  are 
  displaced. 
  The 
  

   position 
  of 
  the 
  dorsal 
  fin 
  is 
  indicated 
  by 
  its 
  supports, 
  

   about 
  13 
  in 
  number, 
  while 
  the 
  anal 
  fin, 
  showing 
  11 
  

   supports, 
  arises 
  opposite 
  its 
  hinder 
  end. 
  The 
  caudal 
  

   fin 
  is 
  distinctly 
  forked 
  and 
  exhibits 
  some 
  of 
  the 
  fulcra 
  

   on 
  its 
  inferior 
  margin. 
  The 
  incomplete 
  left 
  pectoral 
  

   fin 
  is 
  exposed, 
  and 
  both 
  pelvic 
  fins, 
  with 
  their 
  supports, 
  

   buried 
  in 
  the 
  delicate 
  squamation. 
  Enniskillen 
  Coll. 
  

  

  43055. 
  Another 
  fine 
  specimen, 
  displaying 
  the 
  fulcra 
  on 
  the 
  pelvic 
  

   and 
  caudal 
  fins. 
  The 
  form 
  of 
  some 
  of 
  the 
  abdominal 
  

   scales 
  is 
  also 
  well 
  shown. 
  Purchased, 
  1871. 
  

  

  35561-62, 
  35725. 
  Three 
  imperfect 
  and 
  distorted 
  small 
  specimens, 
  

   displaying 
  the 
  delicate 
  though 
  completed 
  ring-vertebrae 
  

   in 
  the 
  caudal 
  region, 
  and 
  the 
  stout 
  haemal 
  spines 
  sup- 
  

   porting 
  the 
  caudal 
  fin. 
  Purchased, 
  1858-59. 
  

  

  38163-64, 
  38536-37. 
  Four 
  small 
  specimens, 
  variously 
  imperfect. 
  

  

  Purchased, 
  1864. 
  

  

  39862, 
  39871. 
  A 
  similar 
  specimen 
  and 
  a 
  larger 
  fish, 
  the 
  latter 
  

   exhibiting 
  13 
  rays 
  in 
  the 
  dorsal 
  fin 
  and 
  remains 
  of 
  the 
  

   fulcra 
  on 
  the 
  pectoral 
  and 
  caudal 
  fins. 
  Purchased, 
  1866. 
  

  

  43007. 
  Fish 
  elongated 
  by 
  distortion. 
  

  

  Purchased. 
  1871. 
  

  

  P. 
  939, 
  a-c. 
  Four 
  imperfect 
  specimens, 
  two 
  being 
  labelled 
  " 
  Lepto- 
  

   lepis 
  caudalis 
  " 
  by 
  Agassiz. 
  Egerton 
  Coll. 
  

  

  P. 
  3662, 
  P. 
  3664 
  a, 
  P. 
  4370. 
  Seven 
  imperfect 
  specimens, 
  one 
  shown 
  

   of 
  the 
  natural 
  size 
  in 
  PL 
  XVIII. 
  fig. 
  2. 
  Enniskillen 
  Coll. 
  

  

  P. 
  6067. 
  Small 
  fish 
  displaying 
  separate 
  pleurocehtra 
  and 
  hypocentra 
  

   in 
  the 
  abdominal 
  region, 
  delicate 
  ring- 
  vertebrae 
  in 
  the 
  

   caudal 
  region. 
  Presented 
  by 
  F. 
  Harford, 
  Esq., 
  1889. 
  

  

  The 
  following 
  specimens 
  may 
  perhaps 
  be 
  unusually 
  large 
  examples 
  

   of 
  P. 
  caudalis, 
  but 
  are 
  too 
  imperfect 
  for 
  certain 
  determination 
  : 
  — 
  

  

  P. 
  899 
  a, 
  b. 
  Imperfect 
  fish, 
  originally 
  about 
  0*185 
  in 
  length, 
  showing 
  

   minute 
  fulcra 
  on 
  the 
  median 
  fins, 
  also 
  a 
  distorted 
  spe- 
  

   cimen 
  ; 
  Lyme 
  Eegis. 
  Egerton 
  Coll. 
  

  

  