﻿semionotid^:. 
  155 
  

  

  much 
  less 
  deep 
  than 
  the 
  suboperculum, 
  the 
  preoperculum 
  narrow 
  

   and 
  almost 
  covered 
  by 
  the 
  suborbitals 
  ; 
  the 
  external 
  bones 
  more 
  or 
  

   less 
  ornamented 
  with 
  superficial 
  tuberculations 
  of 
  ganoine. 
  Mar- 
  

   ginal 
  teeth 
  styliform, 
  in 
  close 
  regular 
  series. 
  Fin-fulcra 
  large 
  and 
  

   uniserial. 
  Pectoral 
  fins 
  large, 
  situated 
  well 
  upon 
  the 
  flank, 
  pelvic 
  

   fins 
  smaller 
  ; 
  dorsal 
  and 
  anal 
  fins 
  remote 
  and 
  opposite, 
  not 
  much 
  

   elongated 
  ; 
  caudal 
  fin 
  forked. 
  Scales 
  quadrangular, 
  robust, 
  very 
  

   deep 
  on 
  the 
  flank, 
  more 
  or 
  less 
  tuberculated, 
  and 
  the 
  anterior 
  border 
  

   strengthened 
  by 
  a 
  robust 
  inner 
  rib, 
  which 
  forms 
  the 
  peg-and-socket 
  

   articulation; 
  the 
  series 
  between 
  the 
  dorsal 
  and 
  anal 
  fins 
  sharply 
  

   turned 
  forwards 
  for 
  a 
  short 
  space 
  above 
  and 
  below 
  ; 
  dorsal 
  and 
  

   ventral 
  ridge-scales 
  conspicuous. 
  

  

  Cleithrolepis 
  granulatus, 
  Egerton. 
  

  

  1864. 
  Cleithrolepis 
  granulatus, 
  Sir 
  P. 
  Egerton, 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  

  

  vol. 
  xx. 
  p. 
  3, 
  pi. 
  i. 
  figs. 
  2, 
  3. 
  

   1890. 
  Cleithrolepis 
  granulatus, 
  A. 
  S. 
  Woodward, 
  Mem. 
  Geol. 
  Surv. 
  

  

  N. 
  S. 
  Wales, 
  Palasont. 
  no. 
  4, 
  p. 
  39, 
  pi. 
  vii., 
  pi. 
  viii. 
  figs. 
  2, 
  3. 
  

   1890. 
  Cleithrolepis 
  granulatus, 
  0. 
  Feistmantel, 
  ibid. 
  no. 
  3, 
  p. 
  75, 
  pi. 
  xxix. 
  

  

  fig. 
  8. 
  

  

  Type. 
  Nearly 
  complete 
  fish. 
  

  

  The 
  type 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  0*15. 
  Maximum 
  

   depth 
  of 
  trunk 
  about 
  equal 
  to 
  its 
  length 
  (exclusive 
  of 
  the 
  caudal 
  

   fin) 
  and 
  somewhat 
  more 
  than 
  four 
  times 
  as 
  great 
  as 
  the 
  depth 
  of 
  

   the 
  caudal 
  pedicle. 
  Head 
  with 
  opercular 
  apparatus 
  occupying 
  less 
  

   than 
  one-fifth 
  of 
  the 
  total 
  length 
  of 
  the 
  fish, 
  and 
  its 
  height 
  at 
  the 
  

   anterior 
  margin 
  of 
  the 
  operculum 
  contained 
  slightly 
  more 
  than 
  

   two-and-a-half 
  times 
  in 
  the 
  maximum 
  depth 
  of 
  the 
  trunk 
  ; 
  depth 
  

   of 
  operculum 
  only 
  half 
  that 
  of 
  the 
  suboperculum, 
  which 
  is 
  twice 
  as 
  

   deep 
  as 
  broad. 
  External 
  bones 
  and 
  scales 
  finely 
  and 
  closely 
  tuber- 
  

   culated. 
  Pelvic 
  fins 
  arising 
  midway 
  between 
  the 
  pectoral 
  and 
  anal 
  

   fins 
  ; 
  dorsal 
  fin, 
  with 
  about 
  17 
  rays, 
  arising 
  at 
  the 
  commencement 
  

   of 
  the 
  posterior 
  third 
  of 
  the 
  trunk 
  : 
  anal 
  fin 
  arising 
  more 
  posteriorly 
  

   but 
  terminating 
  at 
  the 
  same 
  point, 
  and 
  comprising 
  not 
  more 
  than 
  

   12 
  rays. 
  Flank-scales 
  very 
  deep, 
  some 
  of 
  those 
  of 
  the 
  lateral 
  line 
  

   five 
  or 
  six 
  times 
  as 
  deep 
  as 
  broad, 
  none 
  serrated 
  on 
  the 
  hinder 
  

   border 
  ; 
  the 
  vertical 
  series 
  on 
  the 
  caudal 
  region 
  rapidly 
  narrowed 
  ; 
  

   ridge-scales 
  apparently 
  not 
  crenulated. 
  

  

  Each 
  ventral 
  ridge-scale 
  is 
  shown 
  in 
  several 
  specimens 
  to 
  consist 
  

   of 
  a 
  right 
  and 
  left 
  half, 
  apparently 
  meeting 
  at 
  a 
  very 
  obtuse 
  angle 
  

   in 
  the 
  median 
  line 
  : 
  and 
  it 
  is 
  thus 
  evident 
  that 
  the 
  lower 
  portion 
  of 
  

   the 
  abdomen 
  was 
  broad 
  during 
  life. 
  The 
  fish 
  is, 
  indeed, 
  of 
  so 
  

   remarkable 
  a 
  form 
  that 
  the 
  fossilized 
  examples 
  are 
  very 
  variously 
  

  

  