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  ACTINOPTERYGII. 
  

  

  (jyrna;.) 
  are 
  preserved, 
  one 
  at 
  the 
  rostral 
  end 
  of 
  the 
  cranial 
  

   roof, 
  the 
  other 
  just 
  to 
  the 
  right 
  of 
  the 
  right 
  frontal 
  ; 
  each 
  

   with 
  an 
  extended 
  oral 
  margin 
  and 
  exhibiting 
  a 
  broad 
  

   ascending 
  process 
  at 
  the 
  middle 
  of 
  its 
  upper 
  edge. 
  The 
  left 
  

   maxilla 
  (mcc.) 
  occurs 
  in 
  position, 
  much 
  deepened 
  behind 
  and 
  

   bearing 
  very 
  slender 
  teeth 
  ; 
  above 
  it 
  is 
  a 
  relatively 
  large 
  

   supramaxilla 
  (s.mx.). 
  The 
  right 
  mandibular 
  ramus 
  (md.), 
  

   imperfectly 
  preserved 
  and 
  wanting 
  its 
  hinder 
  end, 
  is 
  

   displaced 
  beneath 
  the 
  head, 
  and 
  shows 
  traces 
  of 
  small, 
  

   stout 
  conical 
  teeth. 
  The 
  hyomandibular 
  (hm.) 
  is 
  partly 
  

   exposed 
  in 
  position, 
  but 
  the 
  remainder 
  of 
  the 
  suspensorium 
  

   is 
  very 
  fragmentary, 
  the 
  metapterygoid 
  only 
  being 
  dis- 
  

   played 
  on 
  the 
  counterpart, 
  and 
  two 
  isolated 
  bones 
  (sym.) 
  

   being 
  perhaps 
  the 
  sympleetics 
  ; 
  the 
  large 
  posterior 
  sub- 
  

   orbitals 
  (5.0.) 
  are 
  obscurely 
  indicated, 
  and 
  there 
  are 
  

   remains 
  also 
  of 
  a 
  smaller 
  circumorbital 
  ring 
  (c.o.). 
  The 
  

   epihyal 
  (ep.li.) 
  and 
  ceratohyal 
  (c.h.) 
  elements 
  are 
  shown, 
  

   the 
  former 
  triangular 
  and 
  equilateral, 
  the 
  latter 
  much 
  

   contracted 
  in 
  front. 
  All 
  the 
  opercular 
  bones 
  of 
  the 
  

   right 
  side 
  are 
  shown 
  from 
  the 
  inner 
  aspect, 
  the 
  operculum 
  

   (op.) 
  being 
  about 
  as 
  broad 
  as 
  deep 
  with 
  truncated 
  postero- 
  

   superior 
  angle, 
  the 
  suboperculum 
  (s.op.) 
  with 
  a 
  large 
  

   anterior 
  ascending 
  process, 
  the 
  interoperculum 
  (i.op.) 
  

   elongate-triangular, 
  and 
  the 
  preoperculum 
  (p.op.) 
  narrow 
  

   and 
  arched. 
  There 
  are 
  branchiostegal 
  rays 
  below 
  (br.). 
  

   Nothing 
  can 
  be 
  ascertained 
  as 
  to 
  the 
  ornamentation 
  of 
  

   the 
  external 
  bones. 
  The 
  right 
  supratemporal 
  (st.) 
  is 
  

   exposed 
  from 
  the 
  inner 
  aspect, 
  and 
  there 
  are 
  traces 
  of 
  the 
  

   enlarged 
  postclavicular 
  scales 
  (p.cl.). 
  One 
  of 
  the 
  clavicles 
  

   and 
  both 
  the 
  pelvic 
  fin-supports 
  are 
  displaced 
  beneath 
  

   the 
  trunk 
  ; 
  and, 
  as 
  shown 
  by 
  Winkler's 
  figure, 
  both 
  the 
  

   fins 
  and 
  squamation 
  are 
  much 
  disturbed. 
  The 
  anterior 
  

   margin 
  of 
  the 
  dorsal 
  fin 
  displays 
  conspicuous 
  fulcra, 
  as 
  

   also 
  does 
  that 
  of 
  the 
  lower 
  lobe 
  of 
  the 
  caudal 
  fin, 
  but 
  it 
  is 
  

   not 
  clear 
  whether 
  they 
  are 
  uniserial; 
  one 
  of 
  these 
  elements 
  

   displayed 
  below 
  the 
  caudal 
  fin 
  is 
  distinctly 
  so, 
  but 
  it 
  may 
  

   have 
  been 
  basal. 
  The 
  scales 
  are 
  not 
  so 
  much 
  deepened 
  on 
  

   the 
  flank 
  as 
  is 
  suggested 
  by 
  Winkler's 
  figure, 
  and 
  a 
  large 
  

   group 
  of 
  the 
  much 
  narrowed 
  ventral 
  scales 
  is 
  displaced 
  

   beneath 
  the 
  head. 
  All 
  are 
  thick, 
  and 
  whenever 
  well 
  

   displayed 
  in 
  the 
  abdominal 
  region 
  they 
  exhibit 
  delicate 
  

   serrations 
  on 
  the 
  posterior 
  margin 
  ; 
  many 
  are 
  also 
  finely 
  

   pectinated. 
  Fan 
  Breda 
  Coll. 
  

  

  