﻿PHOLIDOPHOKID^. 
  451 
  

  

  depth 
  of 
  the 
  trunk, 
  and 
  occupying 
  one-fifth 
  of 
  the 
  total 
  length 
  

   of 
  the 
  fish. 
  The 
  rugose 
  ornament 
  of 
  the 
  head 
  and 
  opercular 
  bones 
  

   very 
  feeble 
  and 
  often 
  in 
  radiating 
  lines 
  ; 
  maxilla 
  and 
  dentary 
  

   marked 
  with 
  fine, 
  prominent, 
  irregular 
  longitudinal 
  striations. 
  

   Fulcra 
  minute 
  on 
  all 
  fins 
  except 
  the 
  caudal, 
  on 
  which 
  they 
  are 
  

   larger. 
  Pectoral 
  fins 
  with 
  about 
  18 
  rays 
  and 
  larger 
  than 
  the 
  pelvic 
  

   fins, 
  which 
  have 
  14 
  rays 
  and 
  arise 
  considerably 
  in 
  advance 
  of 
  the 
  

   middle 
  point 
  of 
  the 
  trunk 
  ; 
  dorsal 
  fin 
  with 
  about 
  12 
  rays, 
  directly 
  

   opposed 
  to 
  the 
  pelvic 
  pair. 
  Scales 
  large 
  and 
  smooth, 
  the 
  hinder 
  

   margin 
  not 
  serrated 
  and 
  very 
  slightly 
  convex 
  ; 
  four 
  longitudinal 
  

   flank-series 
  much 
  deeper 
  than 
  broad. 
  

   Form. 
  <fy 
  Loc. 
  Lower 
  Lias 
  : 
  Dorsetshire. 
  

  

  All 
  the 
  following 
  specimens 
  were 
  obtained 
  from 
  the 
  neighbour- 
  

   hood 
  of 
  Lyme 
  Eegis 
  : 
  — 
  

  

  25276-77. 
  Two 
  imperfect 
  and 
  distorted 
  fishes 
  about 
  0*17 
  in 
  length. 
  

  

  Purchased, 
  1850. 
  

  

  28281. 
  An 
  equally 
  large 
  specimen, 
  displaying 
  the 
  left 
  lateral 
  and 
  

   partly 
  ventral 
  aspect. 
  Purchased, 
  1853. 
  

  

  32403. 
  Fine 
  specimen 
  0'16 
  in 
  length, 
  partly 
  crushed 
  and 
  fractured 
  

   but 
  showing 
  portions 
  of 
  all 
  the 
  fins. 
  Purchased, 
  1857. 
  

  

  38162, 
  39838. 
  One 
  smaller 
  and 
  one 
  larger 
  fish, 
  somewhat 
  elongated 
  

   by 
  crushing. 
  In 
  the 
  second 
  specimen 
  the 
  depth 
  of 
  the 
  

   very 
  small 
  dorsal 
  fin 
  is 
  shown. 
  Purchased, 
  1864, 
  1866, 
  

  

  P. 
  3586, 
  a-e. 
  Five 
  large 
  and 
  well-preserved 
  specimens, 
  three 
  dis- 
  

   playing 
  the 
  general 
  proportions 
  of 
  the 
  fish, 
  the 
  two 
  others 
  

   more 
  distorted. 
  The 
  second 
  fossil 
  exhibits 
  some 
  flank- 
  

   scales 
  with 
  the 
  articulating 
  peg 
  as 
  robust 
  as 
  described 
  by 
  

   Agassiz 
  in 
  P. 
  bechei, 
  and 
  others 
  with 
  this 
  peg 
  as 
  long 
  and 
  

   slender 
  as 
  in 
  the 
  so-called 
  P. 
  onychitis. 
  Enniskillen 
  Coll. 
  

  

  P. 
  1052 
  a-g, 
  P. 
  1051. 
  Seven 
  imperfect 
  specimens, 
  of 
  large 
  or 
  

   moderate 
  size. 
  In 
  the 
  first 
  fossil 
  the 
  dorsal 
  and 
  pelvic 
  

   fins 
  are 
  displayed, 
  the 
  former 
  with 
  a 
  few 
  minute 
  fulcra, 
  

   the 
  latter 
  without 
  fulcra. 
  Egerton 
  Coll. 
  

  

  P. 
  3586 
  f. 
  Fish 
  about 
  0*155 
  in 
  length. 
  Enniskillen 
  Coll. 
  

  

  39858. 
  A 
  similar 
  fish, 
  vertically 
  cleft 
  and 
  displaying 
  the 
  well- 
  

   preserved 
  squamation 
  of 
  both 
  sides. 
  The 
  right 
  side 
  of 
  

   the 
  specimen 
  is 
  shown, 
  of 
  the 
  natural 
  size, 
  in 
  PI. 
  XII. 
  

  

  