﻿

  

  498 
  ACTINOPTERYGII. 
  

  

  Genus 
  SPATHIURUS, 
  Davis. 
  

   [Trans. 
  Boy. 
  Dublin 
  Soc. 
  (2) 
  vol. 
  iii. 
  1887, 
  p. 
  502.] 
  

   Syn. 
  Amphilaphurus, 
  J. 
  W. 
  Davis, 
  ibid. 
  1887, 
  p. 
  504. 
  

  

  Head 
  large 
  and 
  trunk 
  not 
  much 
  tapering 
  in 
  the 
  caudal 
  region 
  ; 
  

   [jaws 
  and 
  teeth 
  unknown]. 
  Vertebral 
  centra 
  usually 
  about 
  as 
  long 
  

   as 
  deep, 
  and 
  the 
  side 
  of 
  each 
  exhibiting 
  a 
  median 
  longitudinal 
  

   ridge 
  with 
  a 
  deep 
  pit 
  above 
  and 
  below. 
  Fin-rays 
  robust, 
  all 
  closely 
  

   articulated 
  and 
  divided 
  at 
  some 
  distance 
  from 
  the 
  base 
  ; 
  fulcra 
  

   present 
  on 
  both 
  median 
  and 
  paired 
  fins. 
  Paired 
  fins 
  large, 
  the 
  

   pel 
  vies 
  as 
  deep 
  as 
  the 
  anal 
  ; 
  dorsal 
  fin 
  occupying 
  the 
  greater 
  part 
  of 
  

   the 
  back, 
  and 
  anal 
  fin 
  small, 
  opposed 
  to 
  the 
  hinder 
  extremity 
  of 
  the 
  

   latter 
  ; 
  caudal 
  fin 
  slightly 
  excavated 
  at 
  its 
  hinder 
  margin. 
  Scales 
  

   large. 
  

  

  Spathiurus 
  dorsalis, 
  Davis. 
  

  

  1887. 
  Spathiurus 
  dorsalis, 
  J. 
  W. 
  Davis, 
  Trans. 
  Eoy. 
  Dublin 
  Soc. 
  [2] 
  

  

  vol. 
  iii. 
  p. 
  503, 
  pi. 
  xxxv. 
  fig. 
  1. 
  

   1887. 
  Amphilaphurus 
  major, 
  J. 
  W. 
  Davis, 
  ibid. 
  vol. 
  iii. 
  p. 
  504, 
  pi. 
  xxiv. 
  

  

  fig. 
  2. 
  [Caudal 
  region 
  ; 
  British 
  Museum.] 
  

  

  Type. 
  Imperfect 
  trunk 
  ; 
  British 
  Museum. 
  

  

  The 
  type 
  species, 
  attaining 
  a 
  length 
  of 
  not 
  less 
  than 
  0*35, 
  imper- 
  

   fectly 
  known. 
  Caudal 
  pedicle 
  apparently 
  more 
  than 
  half 
  as 
  deep 
  

   as 
  the 
  abdominal 
  region. 
  Vertebrae 
  somewhat 
  deeper 
  than 
  long. 
  

   Dorsal 
  fin 
  comprising 
  about 
  45 
  rays, 
  not 
  extending 
  quite 
  to 
  the 
  

   caudal 
  ; 
  anal 
  fin 
  with 
  10 
  rays, 
  remote 
  from 
  the 
  caudal 
  and 
  much 
  

   nearer 
  the 
  pelvic 
  fins. 
  

  

  Form. 
  6f 
  Log. 
  Upper 
  Senonian 
  : 
  Mt. 
  Lebanon. 
  

  

  P. 
  4867. 
  Type 
  specimen 
  described 
  and 
  figured 
  loc. 
  cit.; 
  Hakel. 
  

   There 
  is 
  no 
  evidence 
  of 
  the 
  extension 
  of 
  the 
  anal 
  fin 
  

   beyond 
  10 
  rays. 
  Lewis 
  Coll. 
  

  

  P. 
  4746. 
  Type 
  specimen 
  of 
  the 
  so-called 
  Amphilaphurus 
  major, 
  

   described 
  and 
  figured 
  loc. 
  cit. 
  ; 
  Hakel. 
  The 
  two 
  pelvic 
  

   fins 
  are 
  crushed 
  together, 
  and 
  apparently 
  regarded 
  as 
  one 
  

   by 
  Davis 
  ; 
  the 
  " 
  horse-shoe-shaped 
  " 
  pelvic 
  bone 
  of 
  his 
  

   description 
  is 
  a 
  misapprehension, 
  the 
  fragments 
  preserved 
  

   undoubtedly 
  indicating 
  a 
  pair 
  of 
  normal 
  pelvic 
  bones 
  

   expanded 
  at 
  each 
  extremity. 
  Lewis 
  Coll. 
  

  

  P. 
  5995-96. 
  Two 
  examples 
  of 
  the 
  middle 
  portion 
  of 
  the 
  trunk 
  ; 
  

   Hakel. 
  The 
  first 
  specimen 
  shows 
  especially 
  stout 
  neural 
  

  

  