﻿pholidophorid^:. 
  463 
  

  

  trunk 
  with 
  the 
  dorsal, 
  anal, 
  and 
  part 
  of 
  the 
  caudal 
  fins 
  ; 
  

   and 
  a 
  caudal 
  pedicle 
  with 
  some 
  well-preserved 
  scales 
  and 
  

   the 
  greater 
  portion 
  of 
  the 
  caudal 
  fin. 
  

  

  Presented 
  by 
  Edivarcl 
  Wilson, 
  Esq., 
  1889. 
  

  

  The 
  following 
  specimen 
  indicates 
  either 
  an 
  unusually 
  large 
  indi- 
  

   vidual 
  of 
  Pholidophorus 
  higginsi 
  or 
  an 
  allied 
  species 
  : 
  — 
  

  

  41281. 
  Portion 
  of 
  abdominal 
  squamation 
  with 
  fragments 
  of 
  the 
  

   paired 
  fins; 
  Rhsetic 
  (Cotham 
  Marble), 
  Aust 
  Cliff, 
  near 
  

   Bristol. 
  Purchased* 
  1869. 
  

  

  Pholidophorus 
  crenulatus, 
  Egerton. 
  

   [Plate 
  XII. 
  fig. 
  6.] 
  

  

  1843. 
  Pholidophorus 
  crenulatus, 
  Sir 
  P. 
  Egerton, 
  Proc. 
  Geol. 
  Soc. 
  

  

  vol. 
  iv. 
  p. 
  184. 
  

   1852. 
  Pholidophorus 
  crenulatus, 
  Sir 
  P. 
  Egerton, 
  Figs. 
  & 
  Descript, 
  

  

  Brit. 
  Organic 
  Remains, 
  dec. 
  vi. 
  (Mem. 
  Geol. 
  Surv.), 
  no. 
  5, 
  pi. 
  v. 
  

   1887. 
  Isopholis 
  crenulatus, 
  K. 
  A. 
  von 
  Zittel, 
  Handb. 
  Palasont. 
  vol. 
  iii. 
  

  

  p. 
  216. 
  

   1890. 
  Pholidophorus 
  crenulatus, 
  Woodward 
  & 
  Sherborn, 
  Catal. 
  Brit. 
  

  

  Foss. 
  Vertebrata, 
  p. 
  146. 
  

  

  Type. 
  Two 
  imperfect 
  fishes 
  ; 
  British 
  Museum. 
  

  

  A 
  species 
  of 
  slender 
  proportions, 
  attaining 
  a 
  length 
  of 
  about 
  0*15. 
  

   Length 
  of 
  head 
  with 
  opercular 
  apparatus 
  equalling 
  the 
  maximum 
  

   depth 
  of 
  the 
  trunk 
  and 
  one-fifth 
  of 
  the 
  total 
  length 
  of 
  the 
  fish. 
  The 
  

   rugose 
  ornament 
  of 
  the 
  head 
  and 
  opercular 
  bones 
  very 
  feeble 
  or 
  

   absent 
  ; 
  maxilla 
  comparatively 
  robust 
  — 
  this, 
  the 
  dentary, 
  and 
  sub- 
  

   orbitals 
  marked 
  with 
  delicate 
  longitudinal 
  striations 
  ; 
  angle 
  of 
  the 
  

   preoperculum 
  with 
  sparse, 
  short, 
  radiating 
  ridges. 
  Pelvic 
  fins 
  

   arising 
  at 
  a 
  point 
  twice 
  as 
  far 
  from 
  the 
  caudal 
  as 
  from 
  the 
  pectoral 
  

   extremity 
  of 
  the 
  trunk 
  ; 
  dorsal 
  fin 
  opposed 
  to 
  the 
  space 
  between 
  the 
  

   pelvic 
  and 
  anal 
  fins. 
  Scales 
  of 
  moderate 
  size, 
  the 
  hinder 
  margin 
  

   coarsely 
  crenulated, 
  the 
  anterior, 
  inferior, 
  and 
  superior 
  borders 
  with 
  

   a 
  few 
  fine 
  parallel 
  ridges 
  of 
  ganoine 
  corresponding 
  to 
  the 
  lines 
  of 
  

   growth 
  ; 
  flank-scales 
  little 
  deeper 
  than 
  broad. 
  

  

  Form. 
  Sf 
  hoc. 
  Lower 
  Lias 
  : 
  Dorsetshire. 
  

  

  P. 
  572-3. 
  The 
  two 
  type 
  specimens, 
  described 
  and 
  figured 
  loc. 
  cit. 
  

   1 
  852 
  ; 
  Lyme 
  Regis. 
  Egerton 
  Coll. 
  

  

  P. 
  1046 
  a. 
  Fine 
  specimen 
  0*15 
  in 
  length, 
  shown 
  of 
  the 
  natural 
  size 
  

   in 
  PI. 
  XII. 
  fig. 
  6 
  ; 
  Lyme 
  Regis. 
  Traces 
  of 
  ring-vertebra) 
  

   (v.) 
  occur 
  in 
  the 
  abdominal 
  region. 
  Egerton 
  Coll. 
  

  

  