﻿SEMIONOTID^}. 
  

  

  61 
  

  

  An 
  elongated 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  0*15 
  ; 
  the 
  

   depth 
  of 
  the 
  caudal 
  pedicle 
  nearly 
  equalling 
  half 
  the 
  maximum 
  

   depth 
  of 
  the 
  abdominal 
  region. 
  Length 
  of 
  head 
  with 
  opercular 
  

   apparatus 
  slightly 
  less 
  than 
  the 
  maximum 
  depth 
  of 
  the 
  trunk, 
  and 
  

   contained 
  five 
  times 
  in 
  the 
  total 
  length 
  of 
  the 
  fish 
  ; 
  external 
  bones 
  

   coarsely 
  rugose. 
  Pelvic 
  fins 
  relatively 
  large, 
  nearer 
  to 
  the 
  anal 
  

   than 
  to 
  the 
  pectorals 
  ; 
  dorsal 
  fin 
  arising 
  behind 
  the 
  origin 
  of 
  the 
  

   pelvic 
  pair, 
  about 
  as 
  deep 
  as 
  long, 
  and 
  the 
  anal 
  arising 
  opposite 
  its 
  

   hinder 
  extremity. 
  Scales 
  smooth, 
  scarcely 
  deeper 
  than 
  broad 
  upon 
  

   the 
  flank. 
  

  

  Form. 
  Sf 
  Log. 
  Bunter 
  Sandstone 
  : 
  Wasselnheim, 
  Alsace. 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  Semionotus 
  tenuis, 
  A. 
  S. 
  Woodward. 
  

  

  1890. 
  Semionotus 
  tenuis, 
  A. 
  S. 
  Woodward, 
  Mem. 
  Geol. 
  Surv. 
  N. 
  S. 
  

   Wales, 
  Palseont. 
  no. 
  4, 
  p. 
  31, 
  pi. 
  vi. 
  fig. 
  3. 
  

  

  Type. 
  Imperfect 
  fish 
  ; 
  Geological 
  Survey 
  Museum, 
  Sydney. 
  

  

  An 
  elongated 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  0*13 
  ; 
  caudal 
  

   pedicle 
  slender, 
  its 
  depth 
  contained 
  two-and-a-half 
  times 
  in 
  the 
  

   maximum 
  depth 
  of 
  the 
  abdominal 
  region. 
  Length 
  of 
  head 
  with 
  

   opercular 
  apparatus 
  not 
  less 
  than 
  the 
  maximum 
  depth 
  of 
  the 
  trunk, 
  

   and 
  equalling 
  somewhat 
  more 
  than 
  one-fifth 
  of 
  the 
  total 
  length 
  of 
  

   the 
  fish. 
  Pin-fulcra 
  large 
  and 
  very 
  slender 
  ; 
  dorsal 
  fin 
  arising 
  

   about 
  the 
  middle 
  of 
  the 
  back, 
  the 
  length 
  of 
  the 
  first 
  ray 
  equalling 
  

   the 
  depth 
  of 
  the 
  trunk 
  at 
  its 
  insertion 
  : 
  anal 
  fin 
  arising 
  opposite 
  

   the 
  hinder 
  extremity 
  of 
  the 
  dorsal. 
  Scales 
  smooth, 
  those 
  of 
  part 
  

   of 
  the 
  flank 
  twice 
  as 
  deep 
  as 
  broad. 
  

  

  Form. 
  Sf 
  Log. 
  Lower 
  Hawkesbury-Wianamatta 
  Series 
  (Upper 
  

   Trias) 
  : 
  Gosford, 
  New 
  South 
  Wales. 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  The 
  following 
  specimens 
  are 
  not 
  specifically 
  determined 
  : 
  — 
  

  

  38659. 
  Imperfect 
  head 
  and 
  abdominal 
  region 
  of 
  a 
  comparatively 
  

   large 
  and 
  elongated 
  fish 
  with 
  smooth 
  scales 
  ; 
  Keuper, 
  

   Stuttgart. 
  Purchased, 
  1864. 
  

  

  P. 
  1546. 
  Slab 
  with 
  imperfect 
  remains 
  of 
  three 
  small 
  fishes 
  ; 
  Keuper, 
  

   Coburg. 
  Egerton 
  Coll. 
  

  

  The 
  following 
  species 
  of 
  Semionotus, 
  all 
  from 
  Europe 
  except 
  the 
  

   first, 
  have 
  been 
  founded 
  upon 
  specimens 
  which 
  are 
  mostly 
  fragmentary 
  

   and 
  are 
  not 
  represented 
  in 
  the 
  Collection 
  : 
  — 
  

  

  . 
  Semionotus 
  australis, 
  A. 
  S. 
  Woodward, 
  Mem. 
  Geol. 
  Surv. 
  N. 
  S. 
  

   Wales, 
  Paheont. 
  no. 
  4 
  (1890), 
  p. 
  31, 
  pi. 
  vi. 
  fig. 
  2.— 
  

  

  