﻿NO. 
  1948. 
  NEW 
  BROTULID 
  AND 
  CARAPID 
  FISHES— 
  RADCLIFFE. 
  159 
  

  

  nearly 
  equal 
  rays 
  divided 
  nearly 
  to 
  base; 
  scales 
  small, 
  cycloid, 
  cover- 
  

   ing 
  head 
  and 
  body; 
  lateral 
  line 
  indistinguishable. 
  

  

  Type 
  of 
  the 
  genus. 
  — 
  Mastigopterus 
  imperator, 
  new 
  species. 
  

  

  MASTIGOPTERUS 
  IMPERATOR 
  Smith 
  and 
  Radclifie, 
  new 
  species. 
  

   Plate 
  12, 
  fig. 
  1. 
  

  

  Dorsal 
  142; 
  caudal 
  6; 
  anal 
  130; 
  ventrals 
  2; 
  pectorals 
  11. 
  

  

  Head 
  5.42 
  (6.01 
  in 
  total 
  length), 
  massive, 
  arched 
  posteriorly, 
  large 
  

   sinuses, 
  more 
  or 
  less 
  covered 
  with 
  transparent 
  membrane, 
  on 
  infra- 
  

   orbital, 
  mandible, 
  and 
  preopercle; 
  a 
  row,of 
  small 
  pores 
  extending 
  over 
  

   nape, 
  another 
  from 
  upper 
  angle 
  of 
  operculum 
  to 
  upper 
  margin 
  of 
  eye, 
  

   3 
  pores 
  on 
  posterior 
  part 
  of 
  interorbital; 
  2 
  large 
  pores 
  between 
  anterior 
  

   and 
  2 
  smaller 
  ones 
  between 
  posterior 
  nostrils; 
  greatest 
  breadth 
  of 
  

   head 
  1.4 
  in 
  its 
  depth; 
  body 
  robust, 
  compressed 
  posteriorly, 
  tapering 
  

   into 
  a 
  long, 
  filamentous 
  tail, 
  greatest 
  depth 
  5.54 
  (6.15 
  in 
  total 
  length) 
  ; 
  

   eye 
  7.42, 
  moderate, 
  elliptical-oval, 
  high, 
  directed 
  slightly 
  upward; 
  

   snout 
  3.95, 
  broad, 
  little 
  depressed, 
  evenly 
  rounded, 
  not 
  projecting 
  

   beyond 
  mouth; 
  mouth 
  large, 
  oblique, 
  lower 
  jaw 
  included; 
  maxillary 
  

   1.82, 
  strong, 
  reaching 
  an 
  ej^e-diameter 
  beyond 
  vertical 
  from 
  posterior 
  

   margin 
  of 
  eye, 
  posterior 
  end 
  expanded, 
  1.5 
  times 
  as 
  long 
  as 
  eye, 
  lower 
  

   angle 
  longer, 
  acute; 
  teeth 
  small, 
  villiform, 
  in 
  very 
  narrow 
  bonds 
  on 
  

   jaws 
  and 
  vomer, 
  the 
  vomerine 
  patch 
  crescent-shaped; 
  band 
  on 
  right 
  

   palatine 
  bone 
  nearly 
  0.5 
  as 
  broad 
  as 
  long, 
  broadest 
  at 
  the 
  middle, 
  

   anterior 
  end 
  broadly 
  truncate; 
  patch 
  on 
  left 
  palatine 
  with 
  its 
  inner 
  

   margin 
  strongly 
  convex 
  and 
  with 
  a 
  deep 
  incision 
  near 
  anterior 
  end; 
  

   interorbital 
  3.30, 
  broad 
  flattened, 
  2.25 
  times 
  eye; 
  nareal 
  apertures 
  

   large 
  ; 
  opercle 
  armed 
  with 
  a 
  thin, 
  flat 
  triangular 
  spine 
  ; 
  preoperculum 
  

   rounded, 
  angle 
  and 
  horizontal 
  margin 
  with 
  minute 
  serrations; 
  pseudo- 
  

   branchiae 
  absent; 
  gill-filaments 
  short; 
  gill-rakers 
  4+15, 
  10 
  on 
  lower 
  

   limb 
  prolonged, 
  the 
  longest 
  nearly 
  equal 
  to 
  eye; 
  traces 
  of 
  several 
  

   small, 
  rudimentar}^ 
  pyloric 
  coeca; 
  scales 
  small, 
  deciduous, 
  covering 
  

   head 
  and 
  body, 
  and 
  basal 
  portions 
  of 
  dorsal, 
  anal, 
  and 
  pectoral, 
  

   about 
  45 
  in 
  a 
  row 
  from 
  origin 
  of 
  anal 
  to 
  dorsal; 
  lateral 
  line 
  indistin- 
  

   guishable. 
  

  

  Dorsal 
  and 
  anal 
  continuous 
  with 
  the 
  caudal; 
  dorsal 
  fin 
  much 
  

   higher 
  than 
  the 
  anal, 
  the 
  longest 
  as 
  long 
  as 
  snout 
  plus 
  eye; 
  dorsal 
  

   origin 
  above 
  base 
  of 
  pectoral, 
  its 
  distance 
  from 
  tip 
  of 
  snout 
  4.68 
  

   (5.20 
  in 
  total 
  length) 
  ; 
  caudal 
  fin 
  of 
  few 
  rays 
  on 
  a 
  very 
  narrow 
  base 
  

   longest 
  rays 
  more 
  than 
  0.5 
  as 
  long 
  as 
  head; 
  origin 
  of 
  anal 
  from 
  tip 
  

   of 
  snout 
  2.65 
  (2.94 
  in 
  total 
  length), 
  its 
  rays 
  shorter 
  than 
  those 
  of 
  the 
  

   dorsal; 
  ventrals 
  bifid, 
  inner 
  ray 
  slightly 
  longer, 
  1.25 
  times 
  as 
  long 
  

   as 
  head, 
  its 
  tip 
  reaching 
  to 
  vent; 
  pectorals 
  narrow 
  at 
  base, 
  greatly 
  

   produced, 
  basal 
  portion 
  stiffened, 
  the 
  rays 
  closely 
  bound 
  together, 
  

   distal 
  portion 
  whip-like, 
  the 
  rays 
  more 
  or 
  less 
  separated, 
  the 
  longest 
  

   more 
  than 
  3.5 
  times 
  as 
  long 
  as 
  head, 
  1.48 
  (1.65 
  in 
  total 
  length). 
  

  

  