﻿120 
  ACTINOPTEKYGII. 
  

  

  the 
  pectorals 
  and 
  the 
  anal 
  ; 
  anal 
  fin 
  arising 
  opposite 
  the 
  hinder 
  

   portion 
  of 
  the 
  dorsal. 
  Scales 
  smooth, 
  those 
  of 
  the 
  flank 
  with 
  long, 
  

   slender 
  posterior 
  denticulations, 
  which 
  are 
  numerous 
  and 
  closely- 
  

   arranged 
  on 
  the 
  anterior 
  part 
  of 
  the 
  abdominal 
  region, 
  fewer 
  be- 
  

   hind 
  ; 
  principal 
  flank-scales 
  considerably 
  deeper 
  than 
  broad 
  ; 
  dorsal 
  

   ridge-scales 
  acuminate 
  and 
  conspicuous. 
  

  

  Branco 
  recognizes 
  a 
  variety 
  of 
  this 
  species 
  in 
  which 
  the 
  most 
  

   anterior 
  scales 
  exhibit 
  only 
  sparse 
  denticulations, 
  named 
  L. 
  hauche- 
  

   cornei 
  var. 
  paucidentata 
  (Joe. 
  cit. 
  p. 
  356, 
  pi. 
  v. 
  fig. 
  1). 
  To 
  the 
  same 
  

   variety 
  he 
  also 
  doubtfully 
  assigns 
  some 
  fragments 
  determined 
  as 
  

   L.Jlttonibj 
  W. 
  Dunker, 
  Monogr. 
  Norddeutsch. 
  Wealdenbild. 
  (1846), 
  

   p. 
  63, 
  pi. 
  xiv., 
  pi. 
  xv. 
  fig. 
  8. 
  

  

  Form. 
  Sf 
  Log. 
  Wealden 
  : 
  Obernkirchen, 
  Prussia. 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  The 
  following 
  specifically 
  indeterminable 
  specimen 
  exhibits 
  scales 
  

   much 
  resembling 
  those 
  of 
  L. 
  hauchecornei 
  : 
  — 
  

  

  28622. 
  Opercular 
  and 
  pectoral 
  region 
  of 
  a 
  very 
  large 
  fish, 
  with 
  part 
  

   of 
  the 
  abdominal 
  squamation; 
  Purbeck 
  Beds, 
  Swanage. 
  

   The 
  operculum 
  measures 
  0*1 
  in 
  maximum 
  depth 
  and 
  0*055 
  

   in 
  maximum 
  width, 
  and 
  is 
  rugose 
  though 
  very 
  sparsely 
  

   tuberculated. 
  It 
  is 
  more 
  than 
  four 
  times 
  as 
  deep 
  as 
  the 
  

   suboperculum, 
  which 
  is 
  similarly 
  rugose 
  and 
  exhibits 
  the 
  

   usual 
  antero-superior 
  ascending 
  process. 
  The 
  serrations 
  

   on 
  the 
  flank-scales 
  are 
  probably 
  enlarged 
  by 
  imperfect 
  

   preservation, 
  but 
  they 
  must 
  nevertheless 
  have 
  been 
  origi- 
  

   nally 
  very 
  conspicuous. 
  Purchased, 
  1853. 
  

  

  Lepidotus 
  mawsoni, 
  A. 
  S. 
  Woodward. 
  

  

  1860. 
  Lepidotus, 
  Sir 
  P. 
  Egerton, 
  in 
  S. 
  Airport, 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  

  

  vol. 
  xvi. 
  p. 
  265, 
  pi. 
  xiv. 
  figs. 
  5-13, 
  pi. 
  xv. 
  figs. 
  1-4, 
  pi. 
  xvi. 
  

  

  figs. 
  10-12. 
  

   1888. 
  Lepidotus 
  mawsoni, 
  A. 
  S. 
  Woodward, 
  Ann. 
  Mag. 
  Nat. 
  Hist. 
  [6] 
  

  

  vol. 
  ii. 
  p. 
  135. 
  

  

  Type. 
  Detached 
  scales 
  ; 
  British 
  Museum. 
  

  

  A 
  large 
  species 
  known 
  only 
  from 
  detached 
  scales, 
  teeth, 
  and 
  

   fragments. 
  Scales 
  much 
  thickened 
  and 
  deeply 
  overlapping; 
  prin- 
  

   cipal 
  flank-scales 
  with 
  frequently 
  discontinuous 
  enamel, 
  marked 
  

   with 
  a 
  few 
  broad 
  ridges 
  and 
  furrows 
  radiating 
  from 
  the 
  centre 
  to 
  

   the 
  hinder 
  border, 
  where 
  they 
  form 
  feeble 
  indentations 
  ; 
  none 
  of 
  

   the 
  scales 
  serrated. 
  Teeth, 
  apparently 
  of 
  the 
  same 
  fish, 
  rounded 
  

   and 
  comparatively 
  small. 
  

  

  Form. 
  6f 
  Loc. 
  Cretaceous 
  : 
  Bahia, 
  Brazil. 
  

  

  