﻿160 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  tol. 
  44. 
  

  

  Color 
  in 
  alcohol: 
  Body 
  light 
  clay, 
  grayish 
  white 
  beneath 
  scales; 
  

   top 
  of 
  head 
  pearl 
  gray, 
  cheeks 
  and 
  lips 
  6cru 
  drab; 
  opercle 
  with 
  

   blackish 
  shades 
  underneath; 
  branchiostegals, 
  inside 
  of 
  gill-cavity, 
  and 
  

   peritoneum 
  dark 
  seal 
  brown; 
  caudal, 
  posterior 
  rays 
  and 
  margin 
  of 
  

   anterior 
  rays 
  of 
  dorsal 
  and 
  anal 
  clove 
  brown, 
  outer 
  pectoral 
  rays 
  

   dusky, 
  remainder 
  of 
  fins 
  body 
  color. 
  

  

  Type.— 
  Cat. 
  No. 
  74142, 
  U.S.N.M., 
  53.5 
  cm. 
  in 
  length, 
  taken 
  with 
  

   a 
  beam 
  trawl 
  at 
  station 
  5495 
  (lat. 
  9° 
  06' 
  30" 
  N.; 
  long. 
  125° 
  00' 
  

   20" 
  E.), 
  between 
  Leyte 
  and 
  Mindanao, 
  at 
  a 
  depth 
  of 
  976 
  fathoms, 
  

   on 
  a 
  bottom 
  of 
  gray 
  mud. 
  

  

  MASTIGOPTERUS 
  PR^TOR 
  Smith 
  and 
  RadcHfie, 
  new 
  species. 
  

   Plate 
  12, 
  fig. 
  2. 
  

  

  Dorsal 
  131; 
  caudal 
  6; 
  anal 
  115; 
  vcntrals 
  2; 
  pectorals 
  11. 
  

  

  Head 
  5.85 
  (6.51 
  in 
  total 
  length), 
  dorsal 
  outline 
  relatively 
  straight, 
  

   very 
  large 
  sinuses 
  on 
  infraorbital, 
  preopercle, 
  and 
  mandible; 
  pores 
  

   on 
  top 
  of 
  head 
  small, 
  arranged 
  as 
  in 
  imj^erator; 
  greatest 
  breadth 
  of 
  

   head 
  two-thirds 
  of 
  its 
  depth; 
  body 
  compressed, 
  tapering 
  into 
  a 
  

   long, 
  slender 
  tail, 
  greatest 
  depth 
  6.51 
  (7.24 
  in 
  total 
  length); 
  eye 
  

   5.36, 
  large, 
  elliptical-oval, 
  lateral; 
  snout 
  3.93, 
  low, 
  rather 
  pointed, 
  

   not 
  projecting 
  beyond 
  mouth; 
  mouth 
  large, 
  slightly 
  oblique; 
  maxil- 
  

   lary 
  1 
  .73 
  extending 
  0.5 
  an 
  eye 
  diameter 
  beyond 
  vertical 
  from 
  posterior 
  

   margin 
  of 
  eye, 
  posterior 
  end 
  somewhat 
  expanded, 
  its 
  breadth 
  equal 
  

   to 
  diameter 
  of 
  eye; 
  teeth 
  small, 
  villiform, 
  in 
  narrow 
  bands 
  on 
  jaws 
  

   and 
  vomer, 
  vomerine 
  patch 
  f|-shaped; 
  palatine 
  bands 
  broad, 
  as 
  in 
  

   imperator, 
  inner 
  margin 
  anteriorly 
  incised; 
  tongue 
  thick 
  and 
  fleshy; 
  

   interorbital 
  3.28, 
  flattened, 
  about 
  1.6 
  times 
  eye; 
  opercle 
  armed 
  with 
  

   a 
  very 
  thin 
  flat 
  spine, 
  concealed 
  by 
  scales 
  covering 
  opercle; 
  pre- 
  

   operculum 
  unarmed; 
  pseudobranchise 
  absent; 
  gill-filaments 
  very- 
  

   short; 
  gill-rakers 
  5 
  + 
  15, 
  10 
  on 
  lower 
  arch 
  prolonged, 
  slender, 
  the 
  

   longest 
  about 
  three-fourths 
  diameter 
  of 
  eye; 
  pjdoric 
  coeca 
  small, 
  

   rudimentary; 
  scales 
  small, 
  somewhat 
  deciduous, 
  covering 
  head 
  and 
  

   body, 
  and 
  basal 
  portions 
  of 
  dorsal, 
  anal 
  and 
  pectoral, 
  between 
  40 
  and 
  

   45 
  in 
  a 
  row 
  from 
  origin 
  of 
  anal 
  to 
  dorsal; 
  lateral 
  line 
  indistinguishable. 
  

  

  Dorsal 
  and 
  anal 
  continuous 
  with 
  the 
  caudal; 
  dorsal 
  high, 
  the 
  

   longest 
  rays 
  slightly 
  greater 
  than 
  snout 
  plus 
  e^'-e; 
  origin 
  of 
  dorsal 
  

   above 
  base 
  of 
  pectoral, 
  its 
  distance 
  from 
  tip 
  of 
  snout 
  5.48 
  (6.10 
  in 
  

   total 
  length); 
  ventrals 
  bifid, 
  tips 
  filamentous, 
  the 
  inner 
  longer, 
  1.25 
  

   times 
  as 
  long 
  as 
  head, 
  its 
  tip 
  reaching 
  vent 
  ; 
  pectorals 
  narrow, 
  similar 
  

   in 
  form 
  to 
  those 
  of 
  imperator, 
  longest 
  ray 
  about 
  4,5 
  times 
  as 
  long 
  as 
  

   head. 
  

  

  Color 
  in 
  alcohol: 
  Clay, 
  grayish-white 
  underneath 
  scales; 
  cheeks, 
  

   lips 
  and 
  pectorals 
  ^cru 
  drab; 
  opercle 
  with 
  blackish 
  shades 
  under- 
  

   neath; 
  caudal, 
  posterior 
  rays 
  and 
  margin 
  of 
  anterior 
  rays 
  of 
  dorsal 
  

   and 
  anal 
  clove 
  brown; 
  peritoneum 
  dark 
  seal 
  brown. 
  

  

  