﻿250 
  ACTLNOPTERYGII. 
  

  

  supplemented 
  within 
  by 
  a 
  small 
  row, 
  and 
  all 
  the 
  outer 
  teeth 
  

   showing 
  frequent 
  tendency 
  to 
  irregular 
  subdivision. 
  Neural 
  and 
  

   haemal 
  arches 
  of 
  axial 
  skeleton 
  of 
  trunk 
  not 
  expanding 
  sufficiently 
  

   to 
  encircle 
  the 
  notochord. 
  Pin-rays 
  robust, 
  closely 
  articulated, 
  and 
  

   much 
  divided 
  distally. 
  Pelvic 
  fins 
  present; 
  dorsal 
  and 
  anal 
  fins 
  

   high 
  and 
  acuminate 
  in 
  front, 
  low 
  and 
  fringe-like 
  behind, 
  the 
  former 
  

   occupying 
  at 
  least 
  the 
  hinder 
  half 
  of 
  the 
  back 
  and 
  the 
  latter 
  some- 
  

   what 
  shorter, 
  arising 
  more 
  posteriorly 
  ; 
  caudal 
  fin 
  deeply 
  forked, 
  

   with 
  a 
  convexity 
  in 
  the 
  middle. 
  Scales 
  ornamented 
  with 
  reticulating 
  

   rugae 
  and 
  punctations, 
  and 
  occupying 
  only 
  the 
  anterior 
  half 
  of 
  the 
  

   trunk 
  in 
  advance 
  of 
  the 
  median 
  fins. 
  

  

  Ccelodus 
  saturnus, 
  Heckel. 
  

  

  1856. 
  Ccelodus 
  satumus, 
  J. 
  J. 
  Heckel, 
  Denkschr. 
  k. 
  Akad. 
  Wiss., 
  

   math.-naturw. 
  CI. 
  vol. 
  xi. 
  p. 
  207, 
  pis. 
  iii., 
  iv. 
  

  

  1863. 
  Ccelodus 
  satumus, 
  R. 
  Kner, 
  Sitzungsb. 
  k. 
  Akad. 
  Wiss., 
  math.- 
  

   naturw. 
  CI. 
  vol. 
  xlviii. 
  pt. 
  i. 
  p. 
  138. 
  

  

  1867. 
  Ccelodus 
  satumus, 
  R. 
  Kner, 
  ibid. 
  vol. 
  lvi. 
  pt. 
  i. 
  p. 
  198. 
  

  

  Type. 
  Nearly 
  complete 
  fish. 
  

  

  The 
  type 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  0*5. 
  Maximum 
  

   depth 
  of 
  the 
  trunk 
  equalling 
  about 
  one-half, 
  and 
  length 
  of 
  head 
  

   with 
  opercular 
  apparatus 
  one-quarter 
  of 
  the 
  total 
  length 
  of 
  the 
  fish. 
  

   Vertebral 
  axis 
  at 
  origin 
  of 
  dorsal 
  fin 
  midway 
  between 
  the 
  dorsal 
  

   and 
  ventral 
  borders 
  of 
  the 
  fish. 
  Teeth 
  of 
  median 
  series 
  on 
  the 
  

   vomer 
  about 
  twice 
  as 
  broad 
  as 
  long, 
  those 
  of 
  the 
  first 
  lateral 
  series 
  

   little 
  elongated 
  and 
  obliquely 
  set, 
  those 
  of 
  the 
  outer 
  series 
  smaller 
  

   and 
  round 
  or 
  antero-posteriorly 
  elongated. 
  Teeth 
  of 
  the 
  principal 
  

   (inner) 
  series 
  on 
  the 
  splenial 
  bone 
  attaining 
  a 
  breadth 
  about 
  five 
  

   times 
  as 
  great 
  as 
  their 
  length, 
  all 
  nearly 
  destitute 
  of 
  apical 
  indent 
  ; 
  

   those 
  of 
  the 
  next 
  outer 
  series 
  half 
  as 
  large, 
  and 
  about 
  three 
  times 
  

   as 
  broad 
  as 
  long 
  ; 
  those 
  of 
  the 
  outermost 
  series 
  comparatively 
  small 
  

   and 
  round. 
  Dorsal 
  fin 
  with 
  65 
  rays, 
  occupying 
  more 
  than 
  half 
  of 
  

   the 
  back 
  ; 
  anal 
  fin 
  with 
  48 
  rays 
  arising 
  more 
  posteriorly. 
  14-1 
  5 
  

   vertical 
  series 
  of 
  scales. 
  

  

  Form. 
  Sf 
  Log. 
  Cretaceous 
  : 
  Goriansk, 
  Istria. 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  Ccelodus 
  suillus, 
  Heckel. 
  

  

  1856. 
  Ccelodus 
  suillus, 
  J. 
  J. 
  Heckel, 
  Denkschr. 
  k. 
  Akad. 
  Wiss., 
  math.- 
  

   naturw. 
  CI. 
  vol. 
  xi. 
  p. 
  217, 
  pis. 
  vi., 
  vii. 
  

   1882. 
  Ccelodus 
  suillus, 
  F. 
  Bassani, 
  ibid. 
  vol. 
  xlv. 
  p. 
  201. 
  

  

  Type. 
  Fish, 
  wanting 
  caudal 
  fin 
  ; 
  Museum 
  of 
  Gymnasium, 
  Zara. 
  

  

  ( 
  

  

  