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  ACTINOPTERTGII. 
  

  

  into 
  two 
  short 
  median 
  spines, 
  both 
  smooth 
  and 
  the 
  first 
  half 
  as 
  long 
  

   as 
  the 
  second. 
  

  

  Form. 
  Sf 
  Loc. 
  Upper 
  Senonian 
  : 
  Mount 
  Lebanon, 
  Syria. 
  

  

  39239. 
  The 
  type 
  specimen 
  described 
  and 
  figured 
  by 
  Davis, 
  loc. 
  cit. 
  ; 
  

   probably 
  from 
  Hakel. 
  Part 
  of 
  the 
  anterior 
  half 
  of 
  the 
  

   fish 
  is 
  wanting, 
  and 
  the 
  remainder 
  is 
  so 
  much 
  crushed 
  

   and 
  distorted 
  that 
  no 
  elements 
  are 
  distinctly 
  recognizable. 
  

   Two 
  bodies 
  in 
  the 
  abdominal 
  region 
  might 
  be 
  interpreted 
  

   as 
  ring- 
  vertebrae, 
  but 
  they 
  are 
  probably 
  only 
  the 
  expanded 
  

   haemal 
  arches 
  ; 
  and 
  there 
  are 
  no 
  traces 
  of 
  ossifications 
  in 
  

   the 
  notochordal 
  sheath 
  in 
  the 
  caudal 
  region. 
  Owing 
  to 
  

   the 
  partial 
  absence 
  of 
  the 
  squamation 
  in 
  the 
  latter 
  region, 
  

   the 
  neural 
  and 
  haemal 
  spines 
  are 
  exposed 
  ; 
  they 
  seem 
  to 
  

   bear 
  the 
  characteristic 
  laminar 
  expansion 
  on 
  their 
  anterior 
  

   border. 
  The 
  pelvic 
  fins 
  are 
  well-developed 
  and 
  comprise 
  

   considerably 
  elongated 
  stout 
  rays, 
  which 
  do 
  not 
  appear 
  

   to 
  bifurcate, 
  but 
  are 
  articulated 
  at 
  moderately 
  wide 
  

   intervals 
  in 
  their 
  distal 
  two-thirds. 
  The 
  dorsal 
  and 
  anal 
  

   fins 
  consist 
  of 
  similar 
  rays, 
  and 
  the 
  two 
  laterally-apposed 
  

   halves 
  of 
  each 
  are 
  so 
  readily 
  separable, 
  that 
  they 
  are 
  

   mostly 
  displaced 
  in 
  the 
  fossil 
  and 
  produce 
  the 
  false 
  im- 
  

   pression 
  of 
  more 
  fin-rays 
  than 
  supports. 
  Most 
  of 
  these 
  

   supports 
  are 
  widened 
  with 
  little 
  " 
  wings." 
  Of 
  the 
  caudal 
  

   fin 
  only 
  part 
  of 
  the 
  lower 
  lobe 
  is 
  preserved 
  ; 
  it 
  exhibits 
  

   three 
  or 
  four 
  slender 
  fulcral 
  rays 
  at 
  its 
  origin. 
  Some 
  of 
  

   the 
  scales 
  of 
  the 
  right 
  side 
  are 
  displayed 
  from 
  the 
  outer 
  

   aspect, 
  and 
  there 
  are 
  also 
  good 
  impressions 
  of 
  the 
  external 
  

   face 
  of 
  those 
  of 
  the 
  left 
  side. 
  Their 
  form 
  and 
  ornamen- 
  

   tation 
  are 
  noted 
  in 
  the 
  diagnosis, 
  and 
  it 
  is 
  unfortunate 
  

   that 
  the 
  nature 
  of 
  their 
  attached 
  face 
  cannot 
  be 
  deter- 
  

   mined. 
  The 
  very 
  large 
  ridge- 
  scute 
  shortly 
  in 
  advance 
  

   of 
  the 
  pelvic 
  fins 
  has 
  already 
  been 
  remarked 
  upon 
  by 
  

   Davis 
  ; 
  and 
  there 
  can 
  be 
  no 
  doubt 
  that 
  the 
  two 
  smooth 
  

   spines 
  at 
  the 
  origin 
  of 
  the 
  anal 
  fin 
  are 
  fixed 
  either 
  on 
  one 
  

   or 
  two 
  of 
  the 
  scutes 
  of 
  the 
  ventral 
  ridge-series. 
  

  

  Tristram 
  Coll. 
  

  

  Genus 
  PALiEOBALISTUM, 
  Blainville. 
  

  

  [Nouv. 
  Diet. 
  d'Hist. 
  Nat. 
  vol. 
  xxvii, 
  1818, 
  p. 
  338.] 
  

  

  Trunk 
  discoidal, 
  not 
  produced 
  at 
  the 
  caudal 
  pedicle. 
  Head 
  and 
  

  

  opercular 
  bones 
  externally 
  granulated 
  or 
  rugose 
  ; 
  teeth 
  smooth, 
  

  

  sometimes 
  feebly 
  indented 
  ; 
  vomerine 
  teeth 
  arranged 
  in 
  five 
  regular 
  

  

  