﻿amiidj:. 
  367 
  

  

  P. 
  564. 
  Type 
  specimen, 
  evidently 
  owing 
  the 
  relatively 
  great 
  depth 
  

   of 
  the 
  abdominal 
  region 
  to 
  distortion 
  ; 
  Swan 
  age. 
  Some 
  

   of 
  the 
  scales 
  are 
  well 
  preserved 
  in 
  the 
  dorsal 
  part 
  of 
  the 
  

   abdominal 
  region. 
  Egerton 
  Coll. 
  

  

  The 
  following 
  species 
  have 
  also 
  been 
  named 
  and 
  inadequately 
  

   defined, 
  but 
  there 
  are 
  no 
  examples 
  in 
  the 
  Collection 
  : 
  — 
  

  

  Megalurus 
  altivelis, 
  A. 
  Wagner, 
  Abh. 
  k. 
  bay. 
  Akad. 
  AViss., 
  math.- 
  

   phys. 
  CI. 
  vol. 
  ix. 
  (1863), 
  p. 
  716. 
  — 
  Lower 
  Kimmeridgian 
  

   (Lithographic 
  Stone) 
  ; 
  Bavaria. 
  [Imperfect 
  skeleton 
  ; 
  

   Palaeontological 
  Museum, 
  Munich.] 
  

  

  Megalurus 
  idanicus, 
  V. 
  Thiolliere, 
  Ann. 
  Sci. 
  Phys. 
  & 
  Xat. 
  Lyon, 
  

   [2] 
  vol. 
  iii. 
  (1850), 
  p. 
  158, 
  and 
  Poiss. 
  Foss. 
  Pugey, 
  pt. 
  ii. 
  

   (1873), 
  p. 
  22. 
  — 
  Lower 
  Kimmeridgian 
  (Lithographic 
  

   Stone) 
  ; 
  Cirin, 
  Ain, 
  France. 
  [Imperfect 
  fish 
  ; 
  Lyons 
  

   Museum.] 
  

  

  Genus 
  AMIA, 
  Linnaeus. 
  

  

  [Syst. 
  Nat. 
  ed. 
  12, 
  1766, 
  p. 
  500.] 
  

  

  Syn. 
  Cyclurus, 
  L. 
  Agastiz, 
  Poiss. 
  Foss. 
  vol. 
  v. 
  pt. 
  i. 
  1844, 
  p. 
  12. 
  

   Notceus, 
  L. 
  Agassiz, 
  ibid. 
  1844, 
  p. 
  15. 
  

  

  Trunk 
  elongate 
  and 
  laterally 
  compressed. 
  Head 
  large 
  ; 
  supra- 
  

   maxillary 
  bone 
  relatively 
  large 
  ; 
  maxilla, 
  premaxilla, 
  palatine, 
  and 
  

   dentary 
  with 
  a 
  single 
  series 
  of 
  large 
  conical 
  teeth 
  ; 
  the 
  complex 
  

   splenial 
  and 
  other 
  inner 
  elements 
  with 
  minute 
  teeth 
  ; 
  gular 
  plate 
  

   present. 
  Vertebral 
  centra 
  completely 
  ossified 
  in 
  the 
  adult, 
  short 
  

   and 
  biconcave, 
  the 
  hypocentra 
  and 
  pleurocentra 
  forming 
  distinct 
  

   alternating 
  discs 
  in 
  part 
  of 
  the 
  caudal 
  region 
  ; 
  each 
  neural 
  arch 
  

   articulating 
  with 
  two 
  centra, 
  and 
  the 
  abdominal 
  vertebra 
  with 
  

   prominent 
  transverse 
  processes 
  ; 
  ribs 
  at 
  least 
  as 
  long 
  as 
  the 
  neural 
  

   arches 
  in 
  the 
  abdominal 
  region. 
  Fin-fulcra 
  wanting. 
  Dorsal 
  fin 
  

   much 
  extended, 
  occupying 
  more 
  than 
  half 
  the 
  length 
  of 
  the 
  back 
  ; 
  

   anal 
  fin 
  small 
  and 
  short-based 
  : 
  caudal 
  fin 
  with 
  convex 
  hinder 
  

   border. 
  

  

  Amia 
  valenciennesi 
  (Agassiz). 
  

  

  1839-44. 
  Cyclurus 
  valenciennesii, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  v. 
  pt. 
  i. 
  

  

  p. 
  12 
  ; 
  pt. 
  ii. 
  p. 
  44, 
  pi. 
  liii. 
  figs. 
  2, 
  '3. 
  

   1851. 
  Amia, 
  J. 
  J. 
  Heckel, 
  Sitzungsb. 
  k. 
  Akad. 
  Wiss., 
  math.-naturw. 
  

  

  CI. 
  vol. 
  vi. 
  p. 
  223. 
  

   1858. 
  Noteus 
  laticaudus, 
  M. 
  de 
  Series 
  (errore), 
  Comptes 
  Rendus, 
  

  

  vol. 
  xlvi. 
  p. 
  751. 
  

  

  