﻿352 
  

  

  ACTIN0PTERYG1I. 
  

  

  Genus 
  EURYCORMUS, 
  Wagner. 
  

  

  [Abh. 
  k. 
  bay. 
  Akad. 
  Wiss., 
  math.-phys. 
  CI. 
  vol. 
  ix. 
  1863, 
  p. 
  707.] 
  

  

  Syn. 
  Eurypoma, 
  T. 
  H. 
  Huxley, 
  Figs. 
  & 
  Descript. 
  Brit. 
  Organic 
  

   Kemains, 
  dec. 
  xii. 
  (Mem. 
  Geol. 
  Surv. 
  1866), 
  p. 
  32. 
  

  

  Trunk 
  elongate-fusiform. 
  External 
  head-bones 
  and 
  opercular 
  

   bones 
  very 
  feebly 
  ornamented 
  with 
  rugae 
  and 
  tuberculations, 
  all 
  

   moderately 
  robust 
  : 
  snout 
  obtusely 
  pointed, 
  and 
  maxilla 
  laterally 
  

   compressed, 
  gradually 
  deepened 
  behind, 
  with 
  a 
  convexly 
  arched 
  

   dentigerous 
  border 
  ; 
  teeth 
  small 
  and 
  arranged 
  in 
  a 
  regular 
  close 
  

   series 
  on 
  the 
  maxilla 
  and 
  splenial, 
  similarly 
  small 
  and 
  closely 
  

   arranged 
  on 
  the 
  other 
  inner 
  bones, 
  comparatively 
  large 
  in 
  the 
  

   single 
  series 
  occupying 
  the 
  anterior 
  half 
  of 
  the 
  dentary 
  bone. 
  

   Ossifications 
  in 
  the 
  sheath 
  of 
  the 
  notochord 
  well 
  developed, 
  the 
  

   hypocentra 
  and 
  pleurocentra 
  in 
  part 
  of 
  the 
  caudal 
  region 
  forming 
  

   completed 
  alternating 
  rings 
  ; 
  ossified 
  ribs 
  slender. 
  Fulcra 
  com- 
  

   paratively 
  small 
  on 
  the 
  median 
  fins 
  [unknown 
  on 
  the 
  paired 
  fins]. 
  

   Pectoral 
  much 
  exceeding 
  the 
  pelvic 
  fins 
  in 
  size, 
  but 
  the 
  latter 
  well 
  

   developed 
  ; 
  dorsal 
  fin 
  small 
  and 
  triangular, 
  opposed 
  to 
  the 
  pelvic 
  

   pair 
  ; 
  anal 
  fin 
  with 
  somewhat 
  extended 
  base 
  ; 
  caudal 
  fin 
  deeply 
  

   forked. 
  Scales 
  delicate, 
  smooth 
  or 
  very 
  finely 
  tuberculated, 
  deeply 
  

   overlapping, 
  none 
  much 
  deeper 
  than 
  broad, 
  and 
  apparently 
  none 
  

   with 
  peg-and-socket 
  articulation. 
  Lateral 
  line 
  inconspicuous. 
  

  

  Eurycormus 
  speciosus, 
  Wagner. 
  

  

  1863. 
  Eurycormus 
  speciosus, 
  A. 
  Wagner, 
  Abh. 
  k. 
  bay. 
  Akad. 
  Wiss., 
  

  

  math.-phys. 
  CI. 
  vol. 
  ix. 
  p. 
  709, 
  pi. 
  iv. 
  

   1863. 
  " 
  Pholidophorus 
  obscurus, 
  Minister, 
  MS.," 
  A. 
  Wagner, 
  ibid. 
  p. 
  659. 
  

  

  [Imperfect 
  axial 
  skeleton; 
  Palseontological 
  Museum, 
  Munich.] 
  

   1887. 
  Eurycormus 
  speciosus, 
  K. 
  A. 
  von 
  Zittel, 
  Handb. 
  Palseont. 
  vol. 
  iii. 
  

  

  p. 
  230, 
  fig. 
  242. 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  Palseontological 
  Museum, 
  Munich. 
  

  

  The 
  type 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  0*35. 
  Length 
  of 
  

   head 
  with 
  opercular 
  apparatus 
  about 
  equal 
  to 
  the 
  maximum 
  depth 
  

   of 
  the 
  trunk 
  and 
  occupying 
  somewhat 
  less 
  than 
  one-quarter 
  of 
  the 
  

   total 
  length 
  of 
  the 
  fish 
  ; 
  caudal 
  pedicle 
  less 
  than 
  half 
  as 
  deep 
  as 
  the 
  

   abdominal 
  region. 
  External 
  bones 
  smooth. 
  Pelvic 
  fins 
  arising 
  far 
  

   behind 
  the 
  middle 
  point 
  between 
  the 
  pectorals 
  and 
  the 
  anal, 
  opposite 
  

   the 
  origin 
  of 
  the 
  dorsal, 
  which 
  occupies 
  the 
  middle 
  of 
  the 
  back 
  and 
  

   comprises 
  about 
  16 
  rays 
  ; 
  anal 
  fin 
  with 
  about 
  17 
  rays, 
  arising 
  

   immediately 
  behind 
  the 
  termination 
  of 
  the 
  dorsal 
  ; 
  length 
  of 
  each 
  

   lobe 
  of 
  the 
  caudal 
  fin 
  equalling 
  three 
  times 
  the 
  depth 
  of 
  the 
  pedicle 
  

   at 
  its 
  origin. 
  

  

  