﻿PROLIDOrHORID.E. 
  489 
  

  

  the 
  fish 
  ; 
  maximum 
  depth 
  of 
  trunk 
  equalling 
  nearly 
  one-half 
  of 
  the 
  

   length 
  from 
  the 
  pectoral 
  arch 
  to 
  the 
  base 
  of 
  the 
  caudal 
  fin. 
  Dorsal 
  

   fin 
  comprising 
  about 
  10 
  rays, 
  arising 
  at 
  the 
  middle 
  point 
  between 
  

   the 
  occiput 
  and 
  the 
  base 
  of 
  the 
  caudal 
  fin, 
  opposite 
  the 
  origin 
  of 
  

   the 
  anal 
  fin, 
  which 
  has 
  not 
  less 
  than 
  14 
  rays. 
  Scales 
  exhibiting 
  

   only 
  the 
  concentric 
  lines 
  of 
  growth. 
  

  

  Form, 
  fy 
  Loc. 
  Upper 
  Hawkesbury-Wianamatta 
  Series 
  : 
  Talbragar, 
  

   N. 
  S. 
  Wales. 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  Genus 
  CERAMURUS, 
  Egerton. 
  

  

  [Brodie's 
  Eoss. 
  Insects, 
  1845, 
  p. 
  17.] 
  

  

  Trunk 
  not 
  much 
  deepened 
  and 
  head 
  relatively 
  large 
  ; 
  notochord 
  

   persistent, 
  surrounded 
  with 
  spaced 
  ring-vertebrae 
  ; 
  ribs 
  short 
  and 
  

   delicate. 
  Fin-fulcra 
  few, 
  long 
  and 
  slender. 
  Pectoral 
  and 
  pelvic 
  

   fins 
  of 
  moderate 
  size 
  ; 
  dorsal 
  and 
  anal 
  fans 
  not 
  extended, 
  the 
  former 
  

   in 
  advance 
  of 
  the 
  latter. 
  [Elank 
  -scales 
  unknown, 
  but] 
  a 
  series 
  of 
  

   robust 
  ganoid 
  ridge-scales 
  on 
  both 
  borders 
  of 
  the 
  hinder 
  half 
  of 
  the 
  

   caudal 
  region. 
  

  

  Ceramurus 
  macrocephalus, 
  Egerton. 
  

  

  1845. 
  Ceramurus 
  macrocephalus, 
  Sir 
  P. 
  Egerton, 
  in 
  Brodie's 
  Foss. 
  

  

  Insects, 
  p. 
  17, 
  pi. 
  i. 
  fig. 
  2. 
  

   1895. 
  Ceramurus 
  macrocephalus, 
  A. 
  S. 
  .Woodward, 
  Geol. 
  Mag. 
  [4] 
  

  

  vol. 
  ii. 
  p. 
  401. 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  collection 
  of 
  Bev. 
  P. 
  B. 
  Brodie. 
  

  

  The 
  type 
  species, 
  known 
  only 
  by 
  a 
  unique 
  specimen 
  0*043 
  in 
  

   length. 
  Length 
  of 
  head 
  with 
  opercular 
  apparatus 
  about 
  twice 
  as 
  

   great 
  as 
  the 
  maximum 
  depth 
  of 
  the 
  trunk, 
  and 
  contained 
  about 
  

   four 
  times 
  in 
  the 
  total 
  length 
  of 
  the 
  fish. 
  Dorsal 
  fin 
  with 
  about 
  

   10 
  rays, 
  opposed 
  to 
  the 
  pelvic 
  pair 
  ; 
  anal 
  with 
  about 
  8 
  rays, 
  com- 
  

   pletely 
  behind 
  the 
  dorsal. 
  Bidge-scales 
  of 
  upper 
  caudal 
  lobe 
  

   especially 
  acuminate 
  and 
  each 
  produced 
  into 
  a 
  long 
  point. 
  

  

  Form. 
  Sf 
  Loc. 
  Purbeckian 
  : 
  Vale 
  of 
  Wardour, 
  Wiltshire. 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  Some 
  indeterminable 
  immature 
  Triassic 
  fishes, 
  not 
  represented 
  in 
  

   the 
  Collection, 
  but 
  sometimes 
  compared 
  with 
  the 
  Pholidophoridae, 
  

   sometimes 
  with 
  the 
  Leptolepidse, 
  bear 
  the 
  undefined 
  generic 
  name 
  

   of 
  Prohalecites 
  (W. 
  Deecke, 
  Palseontogr. 
  vol. 
  xxxv. 
  1889, 
  p. 
  125). 
  

   Two 
  forms 
  are 
  distinguished 
  as 
  follows 
  : 
  — 
  

  

  Prohalecites 
  microlepidotus 
  : 
  Pholidoplwrus 
  microlepidotus, 
  K. 
  

   Kner, 
  Sitzungsb. 
  k. 
  Akad, 
  Wiss., 
  math.-naturw. 
  CI. 
  vol. 
  liii. 
  

  

  