﻿6 
  ACTINOPTEEYGII. 
  

  

  iin 
  ; 
  dorsal 
  and 
  anal 
  fins 
  arising 
  almost 
  directly 
  opposite 
  to 
  each 
  

   other, 
  nearly 
  equal 
  in 
  size, 
  and 
  the 
  latter 
  well 
  separated 
  from 
  the 
  

   caudal. 
  [Scales 
  not 
  satisfactorily 
  known, 
  but 
  apparently 
  serrated.] 
  

   Form. 
  <Sf 
  Loc. 
  Upper 
  Keuper 
  : 
  Coburg. 
  

  

  P. 
  7395. 
  Large 
  slab 
  of 
  sandstone, 
  with 
  remains 
  of 
  several 
  indi- 
  

   viduals; 
  Coburg. 
  Purchased. 
  

  

  P. 
  3488. 
  Smaller 
  slab 
  with 
  three 
  specimens 
  in 
  an 
  imperfect 
  state 
  of 
  

   preservation 
  ; 
  Coburg. 
  Enniskillen 
  Coll. 
  

  

  Dictyopyge 
  catoptera 
  (Agassiz). 
  

  

  1835. 
  Palceoniscus 
  catopterus, 
  L. 
  Agassiz, 
  Edinb. 
  Phil. 
  Journ. 
  vol. 
  xix. 
  

   p. 
  388. 
  

  

  1836. 
  Palceoniscus 
  catopterus, 
  R. 
  I. 
  Murchison, 
  Proc. 
  Geol. 
  Soc. 
  vol. 
  ii. 
  

   p. 
  206. 
  

  

  1844. 
  Palceoniscus 
  catopterus, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  

  

  p. 
  303 
  (name 
  only). 
  

   1850. 
  Palceoniscus 
  catopterus, 
  W. 
  King, 
  Permian 
  Foss. 
  (Mon. 
  Pal. 
  Soc.) 
  

  

  p. 
  226. 
  

   1850. 
  Palceoniscus 
  catopterus, 
  Sir 
  P. 
  Egerton, 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  

  

  vol. 
  vi, 
  p. 
  4. 
  

   1858. 
  Palceoniscus 
  catopterus, 
  Sir 
  P. 
  Egerton, 
  ibid. 
  vol. 
  xiv. 
  p. 
  165, 
  

  

  pi. 
  xi. 
  fig. 
  4. 
  

   1877. 
  Dictyopyge 
  catoptera, 
  R. 
  H. 
  Traquair, 
  ibid. 
  vol. 
  xxxiii. 
  p. 
  567. 
  j 
  

  

  Type. 
  Imperfect 
  fishes 
  ; 
  British 
  Museum 
  and 
  Museum 
  of 
  Prac- 
  

   tical 
  Geology. 
  

  

  A 
  small 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  0*07. 
  Length 
  of 
  

   head 
  with 
  opercular 
  apparatus 
  at 
  least 
  equalling 
  the 
  maximum 
  

   depth 
  of 
  the 
  trunk 
  and 
  contained 
  about 
  five 
  times 
  in 
  the 
  total 
  

   length 
  of 
  the 
  fish 
  ; 
  depth 
  of 
  caudal 
  pedicle 
  at 
  least 
  half 
  that 
  of 
  the 
  

   abdominal 
  region. 
  Pelvic 
  fins 
  arising 
  midway 
  between 
  the 
  pectoral 
  

   arch 
  and 
  the 
  anal 
  fin 
  ; 
  dorsal 
  fin 
  arising 
  considerably 
  in 
  advance 
  of 
  

   the 
  anal, 
  and 
  apparently 
  nearly 
  as 
  large 
  as 
  the 
  latter. 
  Scales 
  not 
  

   satisfactorily 
  known, 
  but 
  probably 
  smooth 
  and 
  without 
  serrations 
  ; 
  

   many 
  of 
  those 
  of 
  the 
  flank 
  somewhat 
  deeper 
  than 
  broad. 
  [Narrow 
  

   ventral 
  scales 
  not 
  hitherto 
  observed.] 
  

  

  Form. 
  Sf 
  Loc. 
  Keuper 
  : 
  Tyrone, 
  Ireland. 
  

  

  P. 
  1033. 
  Two 
  small 
  slabs 
  of 
  red 
  sandstone, 
  each 
  with 
  two 
  imperfect 
  

   fishes 
  ; 
  Roan 
  Hill, 
  Tyrone. 
  Egerton 
  Coll. 
  

  

  P. 
  3489-91. 
  A 
  large 
  slab 
  and 
  four 
  smaller 
  pieces 
  of 
  similar 
  sand- 
  

   stone 
  with 
  numerous 
  specimens, 
  one 
  labelled 
  by 
  Agassiz 
  ; 
  

   Roan 
  Hill, 
  Tyrone. 
  Enniskillen 
  Coll 
  

  

  