﻿178 
  ACTINOPTEKYGII. 
  

  

  P. 
  7177. 
  Another 
  fine 
  specimen 
  0-165 
  in 
  length, 
  displaying 
  ribs 
  

   and 
  all 
  the 
  fins, 
  as 
  shown 
  in 
  PI. 
  III. 
  fig. 
  4 
  ; 
  Eichstadt. 
  

   The 
  pelvic 
  fin-supports 
  are 
  seen 
  in 
  impression, 
  much 
  con- 
  

   stricted 
  near 
  the 
  distal 
  end, 
  much 
  expanded 
  proximally. 
  

  

  Purchased, 
  1894. 
  

  

  37094. 
  Distorted 
  fish, 
  imperfectly 
  preserved 
  but 
  showing 
  the 
  

   pectinated 
  squamation 
  ; 
  Solenhofeu. 
  Haberlein 
  Coll. 
  

  

  P. 
  956. 
  Imperfect 
  head 
  and 
  abdominal 
  region, 
  showing 
  the 
  paired 
  

   fins 
  ; 
  Kelheim. 
  Egerton 
  Coll. 
  

  

  P. 
  955, 
  P. 
  3616. 
  Imperfect 
  trunk 
  0*07 
  in 
  length, 
  in 
  counterpart, 
  

   with 
  displaced 
  squamation, 
  showing 
  ossified 
  ribs 
  and 
  dorsal 
  

   fin 
  -supports 
  with 
  expanded 
  distal 
  ends 
  ; 
  Kelheim. 
  The 
  

   scales 
  are 
  finely 
  serrated. 
  

  

  Egerton 
  and 
  Ennishillen 
  Colls. 
  

  

  Macrosemius 
  dumortieri 
  (Thiolliere). 
  

  

  1858. 
  Disticholepis 
  dumortieri, 
  V. 
  Thiolliere, 
  Bull. 
  Soc. 
  G6ol. 
  France, 
  

  

  [2] 
  vol. 
  xv. 
  p. 
  783 
  (name 
  only). 
  

   1873. 
  Disticholepis 
  dumortieri, 
  V. 
  Thiolliere, 
  Poiss. 
  Foss. 
  Bugey, 
  pt. 
  ii. 
  

  

  p. 
  15, 
  pi. 
  vi. 
  fig. 
  1. 
  

   1883. 
  Disticholepis 
  dumortieri, 
  H. 
  E. 
  Sauvage, 
  Bull. 
  Soc. 
  Geol. 
  France, 
  

  

  [3] 
  vol. 
  xi. 
  p. 
  479. 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  Lyons 
  Museum. 
  

  

  A 
  species 
  of 
  moderate 
  size. 
  Head 
  with 
  opercular 
  apparatus 
  

   somewhat 
  longer 
  than 
  its 
  maximum 
  depth, 
  and 
  occupying 
  about 
  

   one-quarter 
  of 
  the 
  total 
  length 
  of 
  the 
  fish 
  ; 
  the 
  maximum 
  depth 
  of 
  

   the 
  trunk 
  nearly 
  three 
  times 
  as 
  great 
  as 
  the 
  width 
  of 
  the 
  caudal 
  

   pedicle. 
  Rays 
  of 
  dorsal 
  fin 
  about 
  32 
  in 
  number, 
  denticulated 
  on 
  

   their 
  posterior 
  border 
  and 
  stout 
  but 
  not 
  expanded 
  ; 
  the 
  length 
  of 
  

   those 
  of 
  the 
  caudal 
  region 
  scarcely 
  if 
  at 
  all 
  exceeding 
  the 
  depth 
  of 
  

   that 
  part 
  of 
  the 
  trunk. 
  Pelvic 
  fins 
  arising 
  slightly 
  in 
  advance 
  of 
  

   the 
  middle 
  point 
  between 
  the 
  pectoral 
  and 
  caudal 
  fins, 
  and 
  the 
  anal 
  

   arising 
  shortly 
  behind. 
  Scales 
  conspicuously 
  pectinated. 
  

  

  Form. 
  Sf 
  Log. 
  Lower 
  Kimmeridgian 
  (Lithographic 
  Stone) 
  : 
  Ain, 
  

   France. 
  

  

  P. 
  4684. 
  Imperfect 
  impression 
  of 
  a 
  typical 
  fish 
  ; 
  Cirin. 
  

  

  Purchased, 
  1884. 
  

  

  Macrosemius 
  fourneti 
  (Thiolliere). 
  

  

  1850. 
  Disticholepis 
  fourneti, 
  Ann. 
  Soc. 
  Sci. 
  Phys. 
  & 
  Nat. 
  Lyon, 
  [2] 
  

   vol. 
  iii. 
  p. 
  136. 
  

  

  