﻿274 
  ACTINOPTERYGII. 
  

  

  they 
  approach 
  the 
  anal 
  fin, 
  and 
  the 
  vertical 
  series 
  here 
  

   are 
  bent 
  forwards. 
  Lewis 
  Coll. 
  

  

  P. 
  63. 
  Another 
  imperfect 
  head 
  and 
  trunk, 
  wanting 
  caudal 
  fin 
  ; 
  

   Hakel. 
  Lewis 
  Coll. 
  

  

  P. 
  63 
  a. 
  A 
  smaller 
  specimen, 
  displaying 
  the 
  characteristic 
  form 
  of 
  

   the 
  dorsal 
  and 
  caudal 
  fins 
  ; 
  Hakel. 
  Lewis 
  Coll. 
  

  

  P. 
  4002. 
  Imperfect 
  fish 
  wanting 
  dorsal 
  region, 
  but 
  displaying 
  the 
  

   caudal 
  and 
  anal 
  fins, 
  apparently 
  the 
  " 
  second 
  specimen 
  " 
  

   described 
  as 
  P. 
  ventralis 
  by 
  J. 
  W. 
  Davis, 
  loc. 
  cit. 
  p. 
  500 
  ; 
  

   Hakel. 
  The 
  large 
  pectoral 
  fins 
  are 
  indicated, 
  and 
  the 
  

   diminutive 
  pelvic 
  pair 
  appears 
  not 
  far 
  in 
  advance 
  of 
  the 
  

   anal. 
  In 
  the 
  caudal 
  region 
  both 
  the 
  neural 
  and 
  haemal 
  

   arches 
  are 
  shown 
  to 
  be 
  firmly 
  united 
  by 
  their 
  laminar 
  

   expansions 
  ; 
  each 
  spine 
  exhibiting 
  the 
  lamina 
  behind 
  

   and 
  in 
  front, 
  and 
  this 
  interlocking 
  with 
  the 
  next 
  lamina 
  

   by 
  a 
  jagged 
  suture. 
  The 
  external 
  ornament 
  of 
  the 
  scales 
  

   consists 
  only 
  of 
  fine 
  pittings, 
  and 
  the 
  ventral 
  ridge-scales 
  

   do 
  not 
  appear 
  to 
  have 
  been 
  serrated. 
  The 
  delicate 
  

   squamation 
  of 
  the 
  caudal 
  region 
  extends 
  to 
  the 
  base 
  of 
  

   the 
  anal 
  fin 
  for 
  at 
  least 
  two-thirds 
  of 
  its 
  length, 
  being 
  

   here 
  finely 
  subdivided 
  and 
  arranged 
  in 
  reflexed 
  series 
  as 
  

   in 
  no. 
  P. 
  61. 
  Lewis 
  Coll. 
  

  

  39231. 
  Head 
  and 
  anterior 
  portion 
  of 
  trunk 
  ; 
  Hakel. 
  There 
  are 
  

  

  distinct 
  traces 
  of 
  the 
  interdigitating 
  laminar 
  expansions 
  

   on 
  the 
  neural 
  and 
  haemal 
  arches. 
  Tristram 
  Coll. 
  

  

  39232. 
  Lower 
  half 
  of 
  trunk 
  with 
  caudal 
  fin, 
  in 
  counterpart; 
  Hakel. 
  

  

  In 
  the 
  pectoral 
  fin 
  there 
  are 
  impressions 
  of 
  basals 
  to 
  the 
  

   number 
  of 
  7 
  or 
  8. 
  The 
  caudal 
  fin 
  and 
  parts 
  of 
  the 
  anal 
  

   are 
  especially 
  well 
  preserved 
  ; 
  the 
  small 
  scales 
  extend 
  

   quite 
  to 
  the 
  base 
  of 
  the 
  latter. 
  Three 
  of 
  the 
  haemal 
  

   spines 
  within 
  the 
  caudal 
  fin 
  exhibit 
  a 
  large 
  triangular 
  

   expansion. 
  Tristram 
  Coll. 
  

  

  The 
  following 
  specimen 
  is 
  regarded 
  by 
  J. 
  W. 
  Davis 
  as 
  the 
  type 
  of 
  

   a 
  distinct 
  species, 
  which 
  he 
  names 
  Palazobalistum 
  ventralis 
  (Trans. 
  

   Roy. 
  Dublin 
  Soc. 
  [2] 
  vol. 
  iii. 
  1887, 
  p. 
  499, 
  pi. 
  xxiii.). 
  It 
  is 
  described 
  

   as 
  differing 
  from 
  P. 
  goedeli 
  in 
  the 
  form 
  of 
  the 
  body 
  and 
  the 
  teeth 
  

   (the 
  latter 
  being 
  seen 
  in 
  no. 
  P. 
  61 
  catalogued 
  above, 
  which 
  Davis 
  

   regards 
  as 
  likewise 
  P. 
  ventralis'). 
  The 
  most 
  reasonable 
  explanation 
  

   of 
  the 
  differences 
  noted 
  seems 
  to 
  be, 
  that 
  the 
  undermentioned 
  

  

  