﻿158 
  PROCEEDINOS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  suborbital 
  bones; 
  teeth 
  small, 
  sharp, 
  in 
  broad 
  bands 
  on 
  jaws, 
  vomer 
  

   and 
  palatmes; 
  band 
  on 
  vomer 
  similar 
  to 
  that 
  in 
  B. 
  robustus, 
  except 
  

   that 
  the 
  head 
  of 
  the 
  vomer 
  projects 
  downward 
  much 
  more 
  strongly; 
  

   tongue 
  not 
  as 
  broad 
  as 
  in 
  rohustus, 
  margins 
  rounded, 
  tip 
  pointed, 
  

   its 
  distance 
  from 
  tip 
  of 
  mandible 
  1.7 
  times 
  diameter 
  of 
  eye; 
  opercular 
  

   spine 
  feeble, 
  covered 
  with 
  skin, 
  extending 
  nearly 
  to 
  tip 
  of 
  opercular 
  

   flap; 
  preopercle 
  unarmed, 
  more 
  evenly 
  rounded 
  than 
  in 
  rohustus; 
  

   pseu 
  do 
  branchiae 
  consisting 
  of 
  2 
  short 
  filaments; 
  gill-filaments 
  very 
  

   short; 
  16 
  long, 
  well-developed 
  gill-rakers 
  on 
  lower 
  arch, 
  the 
  longest 
  

   1.7 
  times 
  diameter 
  of 
  eye; 
  pyloric 
  coeca 
  absent; 
  scales 
  large, 
  deciduous, 
  

   covering 
  head 
  and 
  body 
  and 
  fleshy 
  bases 
  of 
  dorsal 
  and 
  anal; 
  it 
  is 
  

   impossible 
  to 
  determine 
  accurately 
  their 
  number, 
  but 
  there 
  appear 
  to 
  

   have 
  been 
  between 
  16 
  and 
  20 
  between 
  origin 
  of 
  anal 
  and 
  dorsal; 
  

   lateral 
  line 
  indistinguishable. 
  

  

  Dorsal 
  and 
  anal 
  continuous 
  with 
  the 
  caudal; 
  dorsal 
  origin 
  close 
  to 
  

   head, 
  its 
  distance 
  from 
  tip 
  of 
  snout 
  5.63 
  (6.08 
  in 
  total 
  length) 
  ; 
  caudal 
  

   very 
  narrow 
  and 
  elongate; 
  origin 
  of 
  anal 
  about 
  0.7 
  length 
  of 
  head 
  

   behind 
  base 
  of 
  lower 
  pectoral 
  rays, 
  its 
  distance 
  from 
  tip 
  of 
  snout 
  3.10 
  

   (3.33 
  in 
  total 
  length) 
  ; 
  ventrals 
  simple, 
  about 
  1.90 
  in 
  head, 
  bases 
  close 
  

   together 
  behind 
  tip 
  of 
  humeral 
  symphysis; 
  pectorals 
  about 
  1.90. 
  

  

  Color 
  in 
  alcohol: 
  Body 
  hair 
  bro^vn, 
  becoming 
  blackish 
  on 
  belly; 
  

   head 
  plumbeous, 
  blackish 
  underneath, 
  darkest 
  on 
  opercles, 
  branchi- 
  

   ostegals 
  and 
  lips; 
  fins 
  dusky; 
  inside 
  of 
  mouth 
  grayish; 
  inside 
  of 
  gill- 
  

   covering 
  and 
  peritoneum 
  dark 
  chestnut 
  brown; 
  stomach 
  bro^\^lish. 
  

  

  Type.—Csit. 
  No. 
  74141, 
  U.S.N.M., 
  48 
  cm. 
  in 
  length, 
  taken 
  with, 
  a 
  

   beam 
  trawl 
  at 
  station 
  5608 
  (lat. 
  0° 
  08' 
  00'' 
  S.; 
  long. 
  121° 
  19' 
  00" 
  E.), 
  

   in 
  the 
  Gulf 
  of 
  Tomini, 
  Celebes, 
  at 
  a 
  depth 
  of 
  1,089 
  fathoms, 
  on 
  a 
  

   bottom 
  of 
  gray 
  mud. 
  

  

  This 
  species 
  differs 
  from 
  B. 
  rohustus 
  in 
  the 
  feebler 
  bony 
  structure 
  

   of 
  the 
  head, 
  the 
  slenderer, 
  more 
  elongate 
  bodj^ 
  larger 
  scales, 
  and 
  

   greater 
  prominence 
  of 
  the 
  vomer, 
  smaller 
  tongue, 
  smaller 
  eye, 
  

   shorter 
  ventrals, 
  and 
  darker 
  coloration. 
  

  

  MASTIGOPTERUS 
  Smith 
  and 
  Radeliffe, 
  new 
  genus. 
  

  

  Body 
  mixoniform, 
  tapering 
  gradually 
  into 
  the 
  long, 
  slender 
  tail; 
  

   head 
  large, 
  thick, 
  with 
  large 
  sinuses 
  and 
  pores; 
  bones 
  of 
  head 
  heavy, 
  

   firm; 
  jaws 
  nearly 
  equal; 
  teeth 
  in 
  narrow 
  villiform 
  bands 
  in 
  jaws 
  and 
  

   on 
  vomer, 
  in 
  broad 
  bands 
  on 
  palatines; 
  pseudobranchise 
  absent; 
  10 
  

   well-developed 
  gill-rakers 
  on 
  first 
  arch; 
  branchiostegals 
  8; 
  pyloric 
  

   coeca 
  rudimentary; 
  operculum 
  armed 
  with 
  a 
  thin, 
  flat, 
  triangular 
  

   spine, 
  nearly 
  concealed 
  by 
  scales; 
  dorsal 
  fin 
  higher 
  than 
  anal; 
  caudal 
  

   fin 
  elongate, 
  of 
  few 
  rays 
  on 
  a 
  very 
  narrow 
  base; 
  pectoral 
  fins 
  of 
  10 
  

   rays, 
  greatly 
  produced, 
  more 
  than 
  half 
  total 
  length, 
  basal 
  portion 
  

   narrov7, 
  constricted, 
  thickened, 
  distal 
  portion 
  filamentous, 
  the 
  rays 
  

   more 
  or 
  less 
  separated; 
  ventral 
  filaments 
  long, 
  each 
  composed 
  of 
  2 
  

  

  