﻿semiokotid^:. 
  57 
  

  

  38660. 
  Several 
  portions 
  of 
  sandstone 
  with 
  remains 
  chiefly 
  of 
  this 
  

   species 
  ; 
  Stuttgart. 
  Purchased, 
  1864. 
  

  

  2845. 
  Two 
  specimens 
  exhibiting 
  portions 
  of 
  the 
  squamation 
  and 
  

   the 
  median 
  fins 
  of 
  a 
  large 
  individual 
  ; 
  Stuttgart. 
  

  

  Van 
  Breda 
  Coll. 
  

  

  Semionotus 
  brodiei, 
  Newton. 
  

  

  1887. 
  Semionotus 
  brodiei, 
  E. 
  T. 
  Newton, 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  

   vol. 
  xliii. 
  p. 
  539, 
  pi. 
  xxii. 
  figs. 
  1-7. 
  

  

  Type. 
  Imperfect 
  fishes 
  : 
  collection 
  of 
  Eev. 
  P. 
  B. 
  Brodie. 
  

  

  A 
  small 
  imperfectly 
  known 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  

   0*1. 
  The 
  maximum 
  depth 
  of 
  the 
  trunk 
  equalling 
  nearly 
  half 
  its 
  

   length 
  from 
  the 
  pectoral 
  arch 
  to 
  the 
  base 
  of 
  the 
  caudal 
  fin, 
  and 
  the 
  

   caudal 
  pedicle 
  slender. 
  Pelvic 
  fins 
  arising 
  midway 
  between 
  the 
  

   pectorals 
  and 
  anal, 
  immediately 
  in 
  advance 
  of 
  the 
  dorsal. 
  Scales 
  

   almost 
  entirely 
  smooth, 
  a 
  few 
  with 
  feeble 
  traces 
  of 
  oblique 
  ridges 
  ; 
  

   those 
  of 
  the 
  anterior 
  part 
  of 
  the 
  flank 
  serrated 
  and 
  about 
  twice 
  as 
  

   deep 
  as 
  broad. 
  

  

  The 
  apparently 
  great 
  depth 
  of 
  the 
  principal 
  flank-scales 
  in 
  this 
  

   species 
  is 
  probably 
  exaggerated 
  by 
  crushing 
  in 
  the 
  imperfect 
  speci- 
  

   mens 
  hitherto 
  discovered. 
  

  

  Form, 
  fy 
  Loc. 
  Upper 
  Keuper 
  : 
  Warwickshire. 
  

  

  P. 
  5207. 
  Imperfect 
  distorted 
  trunk, 
  noticed 
  and 
  scales 
  figured 
  loc. 
  

   cit. 
  p. 
  537, 
  pi. 
  xxii. 
  fig. 
  7 
  ; 
  Shrewley. 
  

  

  Presented 
  by 
  Rev. 
  P. 
  B. 
  Brodie, 
  1886. 
  

  

  Semionotus 
  altolepis, 
  Deecke. 
  

  

  1889. 
  Semionotus 
  altolepis, 
  W. 
  Deecke, 
  Palseontogr. 
  vol. 
  xxxv. 
  p. 
  120, 
  

   pi. 
  vi. 
  fig. 
  10. 
  

  

  Type. 
  Nearly 
  complete 
  fish. 
  

  

  A 
  species 
  attaining 
  a 
  length 
  of 
  about 
  0-12. 
  Trunk 
  regularly 
  

   fusiform, 
  the 
  depth 
  of 
  the 
  caudal 
  pedicle 
  about 
  one-third 
  the 
  

   maximum 
  depth 
  of 
  the 
  abdominal 
  region. 
  Length 
  of 
  head 
  with 
  

   opercular 
  apparatus 
  nearly 
  equal 
  to 
  the 
  maximum 
  depth 
  of 
  the 
  

   trunk, 
  and 
  somewhat 
  exceeding 
  one-quarter 
  of 
  the 
  total 
  length 
  of 
  

   the 
  fish; 
  external 
  bones 
  ornamented 
  with 
  tubercles 
  and 
  rugae. 
  

   Dorsal 
  fin 
  arising 
  about 
  the 
  middle 
  of 
  the 
  back, 
  and 
  the 
  anal 
  fin 
  

   arising 
  opposite 
  its 
  hinder 
  extremity. 
  Scales 
  smooth, 
  those 
  of 
  the 
  

   flank 
  in 
  part 
  about 
  twice 
  as 
  deep 
  as 
  broad, 
  and 
  all 
  the 
  principal 
  

   scales 
  serrated. 
  

  

  Form. 
  <$," 
  Loc. 
  Muschelkalk 
  : 
  Perledo, 
  Como, 
  Italy. 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  