﻿272 
  ACTINOPTERYGII. 
  

  

  Palseobalistum 
  ponsorti, 
  Heckel. 
  

  

  1856. 
  Palceobalistum 
  ponsortii, 
  J. 
  J. 
  Heckel, 
  Denkschr. 
  k. 
  Akad. 
  

   Wiss., 
  math.-naturw. 
  01. 
  vol. 
  xi. 
  p. 
  236, 
  pi. 
  xi. 
  figs. 
  1-15. 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  Court 
  Museum, 
  Vienna. 
  

  

  A 
  small 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  0*2. 
  Maximum 
  depth 
  

   of 
  trunk 
  equalling 
  about 
  three-quarters 
  of 
  the 
  length 
  of 
  the 
  head 
  and 
  

   trunk 
  without 
  caudal 
  fin 
  ; 
  head 
  with 
  opercular 
  apparatus 
  occupying 
  

   about 
  one-quarter 
  of 
  the 
  total 
  length 
  of 
  the 
  fish. 
  Vertebral 
  axis 
  

   at 
  origin 
  of 
  dorsal 
  fin 
  slightly 
  above 
  the 
  middle 
  of 
  the 
  trunk. 
  

   Teeth 
  of 
  inner 
  or 
  principal 
  series 
  of 
  mandible 
  much 
  broader 
  than 
  

   long 
  ; 
  those 
  of 
  the 
  second 
  series 
  scarcely 
  broader 
  than 
  long 
  ; 
  those 
  

   of 
  the 
  outer 
  series 
  smaller 
  and 
  antero-posteriorly 
  elongated. 
  Dorsal 
  

   and 
  anal 
  fins 
  not 
  acuminate 
  in 
  front, 
  but 
  gradually 
  diminishing 
  in 
  

   height 
  backwards 
  ; 
  the 
  dorsal 
  fin 
  with 
  65 
  rays, 
  occupying 
  about 
  

   two-thirds 
  of 
  the 
  back, 
  the 
  anal 
  fin 
  with 
  over 
  50 
  rays. 
  Hinder 
  

   margin 
  of 
  caudal 
  fin 
  slightly 
  sinuous. 
  Scales 
  confined 
  to 
  the 
  

   anterior 
  half 
  of 
  the 
  trunk 
  in 
  advance 
  of 
  the 
  median 
  fins. 
  

  

  Form. 
  Sf 
  Loc. 
  Upper 
  Cretaceous 
  : 
  Marne, 
  France. 
  

  

  All 
  the 
  following 
  specimens 
  were 
  obtained 
  from 
  the 
  uppermost 
  

   chalk 
  of 
  Mont 
  Aime, 
  near 
  Chalons-sur-Marne, 
  in 
  association 
  with 
  

   " 
  Lates 
  hebertiP 
  

  

  28292 
  a. 
  Tine 
  specimen 
  0-107 
  in 
  length, 
  apparently 
  not 
  distorted, 
  

   showing 
  the 
  paired 
  fins. 
  Purchased, 
  1851. 
  

  

  28292. 
  Twelve 
  specimens 
  variously 
  preserved, 
  the 
  large 
  ones 
  frag- 
  

   mentary 
  and 
  one 
  small 
  example 
  much 
  distorted. 
  

  

  Purchased, 
  1851. 
  

  

  P. 
  1638. 
  Well-preserved 
  fish 
  0-125 
  in 
  length. 
  Egerton 
  Coll. 
  

  

  Palseobalistum 
  goedeli, 
  Heckel. 
  

  

  1856. 
  Palceobalistum 
  goedelii, 
  J. 
  J. 
  Heckel, 
  Denkschr. 
  k. 
  Akad. 
  

  

  Wiss., 
  math.-naturw. 
  CI. 
  vol. 
  xi. 
  p. 
  234, 
  pi. 
  ii. 
  figs. 
  3-8. 
  

   1887. 
  Palceobalistum 
  gaidelli, 
  J. 
  W. 
  Davis, 
  Trans. 
  Roy. 
  Dublin 
  Soc. 
  [2] 
  

  

  vol. 
  iii. 
  p. 
  496, 
  pi. 
  xxii. 
  

   1887. 
  Palceobalistum 
  ventralis, 
  J. 
  W. 
  Davis, 
  ibid. 
  p. 
  499, 
  pi. 
  xxiii. 
  

  

  [Distorted 
  fish 
  ; 
  British 
  Museum.] 
  

  

  Type. 
  Caudal 
  portion 
  of 
  a 
  fish 
  ; 
  Court 
  Museum, 
  Vienna. 
  

   . 
  A 
  large 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  0'3. 
  Maximum 
  

   depth 
  of 
  trunk 
  equalling 
  about 
  three-quarters 
  of 
  the 
  length 
  of 
  the 
  

   head 
  and 
  trunk 
  without 
  caudal 
  fin 
  ; 
  head 
  with 
  opercular 
  apparatus 
  

   occupying 
  considerably 
  more 
  than 
  one-quarter 
  of 
  the 
  total 
  length 
  of 
  

  

  