﻿AMIID.E. 
  

  

  301 
  

  

  L. 
  Schmidt, 
  " 
  Untersuchungen 
  zur 
  Kenntniss 
  des 
  Wlrbelbaues 
  

   von 
  Amia 
  calva 
  " 
  (Zeitschr. 
  f*. 
  wiss. 
  Zool. 
  vol. 
  liv. 
  1892, 
  

   pp. 
  748-764, 
  pi. 
  xxxiv.). 
  

  

  Synopsis 
  of 
  Genera. 
  

  

  I. 
  Vertebral 
  elements 
  rudimentaiw 
  or 
  absent 
  ; 
  

  

  dorsal 
  fin 
  short-based. 
  

   Trunk 
  elongate, 
  scarcely 
  tapering 
  ; 
  fulcra 
  

   wanting; 
  caudal 
  fin 
  rounded 
  or 
  only 
  

   slightly 
  forked 
  Liodesmus 
  (p. 
  361). 
  

  

  II. 
  Vertebral 
  elements 
  forming 
  complete 
  discs 
  ; 
  

  

  dorsal 
  fin 
  more 
  or 
  less 
  extended. 
  

   Dorsal 
  fin 
  not 
  occupying 
  more 
  than 
  the 
  middle 
  

  

  third 
  of 
  the 
  back 
  Megalurus 
  (p. 
  363). 
  

  

  Dorsal 
  fin 
  occupying 
  more 
  than 
  half 
  the 
  

  

  length 
  of 
  the 
  back 
  Amia 
  (p. 
  367). 
  

  

  Genus 
  LIODESMUS, 
  Wagner. 
  

  

  [Abh. 
  k. 
  bay. 
  Akad. 
  Wiss., 
  math.-phys. 
  CI. 
  vol. 
  ix. 
  1863, 
  p. 
  709.] 
  

  

  Syn. 
  Lophiurus, 
  B. 
  Vetter, 
  Mittheil. 
  k. 
  mineral.-geol. 
  Mus. 
  Dresden, 
  

   pt. 
  iv. 
  1881, 
  p. 
  116. 
  

  

  Trunk 
  elongate, 
  scarcely 
  tapering 
  to 
  the 
  caudal 
  pedicle. 
  Head 
  

   relatively 
  large, 
  with 
  obtuse 
  snout 
  ; 
  marginal 
  teeth 
  all 
  large 
  and 
  

   ■well-spaced. 
  Notochord 
  persistent, 
  without 
  ossifications 
  in 
  the 
  

   sheath. 
  Fin-fulcra 
  wanting. 
  Dorsal 
  fin 
  short-based, 
  opposed 
  to 
  

   the 
  pelvic 
  pair 
  ; 
  caudal 
  fin 
  fan 
  -shaped 
  or 
  slightly 
  bifurcated. 
  Scales 
  

   very 
  small. 
  

  

  Liodesmus 
  gracilis 
  (Agassiz). 
  

  

  1838-44. 
  Pholidophorus 
  gracilis, 
  L. 
  Agassiz 
  {ex 
  Minister, 
  MS.), 
  Poiss. 
  

   Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  p. 
  285, 
  pi. 
  xlii. 
  fig. 
  2. 
  

  

  1839-44. 
  Megalurus 
  parvus, 
  L. 
  Agassiz 
  {ex 
  Minister, 
  MS.), 
  ibid. 
  vol. 
  ii. 
  

   pt. 
  ii. 
  p. 
  149, 
  pi. 
  Ii. 
  fig. 
  4. 
  [Nearly 
  complete 
  fish 
  ; 
  Palseontological 
  

   Museum, 
  Munich.] 
  

  

  1851. 
  Megalurus 
  parvus, 
  A.Wagner, 
  Abh. 
  k. 
  bay. 
  Akad. 
  Wiss., 
  math.- 
  

   phys. 
  CI. 
  vol. 
  vi. 
  p. 
  70. 
  

  

  1851. 
  Megalurus 
  intermedius, 
  A. 
  Wagner 
  {ex 
  Minister, 
  MS.), 
  ibid. 
  

   p. 
  71. 
  [Nearly 
  complete 
  fish; 
  Palseontological 
  Museum, 
  Mu- 
  

   nich.] 
  

  

  1863. 
  Liodesmus 
  gracilis, 
  A. 
  Wagner, 
  ibid. 
  vol. 
  ix. 
  p. 
  711. 
  

  

  Type. 
  Vertically 
  crushed 
  fish 
  ; 
  Palseontological 
  Museum, 
  Munich. 
  

  

  The 
  type 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  0"06. 
  Head 
  with 
  

  

  opercular 
  apparatus 
  occupying 
  somewhat 
  less 
  than 
  one-quarter 
  of 
  

  

  