﻿136 
  PROCEEDINGS 
  OF 
  THE 
  SATIOS'AL 
  MUSEUM. 
  vol.44. 
  

  

  Heretofore 
  practically 
  no 
  attempt 
  at 
  a 
  natural 
  classification 
  of 
  the 
  

   brotulid 
  genera 
  has 
  been 
  attempted, 
  and 
  many 
  of 
  the 
  generic 
  and 
  

   specific 
  descriptions 
  are 
  lacking 
  in 
  details. 
  These 
  and 
  other 
  factors 
  

   make 
  the 
  identification 
  of 
  species 
  and 
  their 
  arrangement 
  unusually 
  

   difficult. 
  This 
  is 
  especially 
  true 
  of 
  the 
  viviparous 
  forms 
  which 
  

   possess 
  many 
  characters 
  in 
  common 
  and 
  yet 
  have 
  differences 
  which 
  

   are 
  bewildering 
  if 
  one 
  attempts 
  any 
  reduction 
  in 
  the 
  number 
  of 
  

   described 
  genera. 
  

  

  In 
  the 
  following 
  key 
  an 
  attempt 
  has 
  been 
  made 
  to 
  arrange 
  the 
  

   genera 
  according 
  to 
  relationship, 
  as 
  far 
  as 
  could 
  be 
  ascertained: 
  

  

  KEY 
  TO 
  THE 
  GENERA 
  OP 
  BROTULIDS 
  TAKEN 
  ON 
  THE 
  " 
  ALBATROSS 
  " 
  PHILIPPINE 
  

  

  EXPEDITION. 
  

  

  a}. 
  SiREMBiNiE. 
  Clavicular 
  bones 
  greatly 
  produced, 
  meeting 
  below 
  eye; 
  ventral 
  fina 
  

   inserted 
  under 
  eyes, 
  behind 
  tip 
  of 
  humeral 
  symphysis. 
  

   b^. 
  Preopercle 
  unarmed; 
  snout 
  without 
  sharp 
  spine 
  at 
  tip; 
  head 
  entirely 
  scaled; 
  

  

  ventrals 
  simple 
  Sirembo. 
  

  

  h^. 
  Preopercle 
  with 
  three 
  spines; 
  snout 
  with 
  a 
  sharp 
  spine 
  as 
  in 
  species 
  of 
  Lepo- 
  

  

  phidium; 
  head 
  partially 
  naked 
  ; 
  ventrals 
  bifid 
  Hoplobrotula. 
  

  

  a^. 
  Position 
  of 
  humeral 
  symphysis 
  normal, 
  behind 
  eyes; 
  ventral 
  fins 
  inserted 
  behind 
  

   tip 
  of 
  humeral 
  symphysis, 
  

   e^ 
  BROTULIN.E. 
  Snout 
  and 
  lower 
  jaw 
  with 
  barbels; 
  ventral 
  filaments 
  bifid 
  

  

  Brotula. 
  

  

  <?. 
  Head 
  without 
  barbels. 
  

   <P. 
  Nbobythitin.^. 
  Head 
  (normally) 
  entirely 
  scaled. 
  Species 
  as 
  far 
  as 
  known 
  

   oviparous, 
  

   e^ 
  Lateral 
  line 
  when 
  present 
  naiTow, 
  less 
  than 
  one-third 
  diameter 
  of 
  eye 
  in 
  

   width, 
  not 
  unusually 
  modified, 
  without 
  an 
  inner 
  series 
  of 
  enlarged 
  

   plate-like 
  scales 
  covered 
  by 
  band 
  of 
  small 
  scales; 
  no 
  fang-like 
  canines 
  

   present; 
  ventrals 
  present. 
  

   /^ 
  Lateral 
  line 
  distinct 
  anteriorly, 
  disappearing 
  mesially 
  or 
  posteriorly; 
  

   preopercle 
  armed. 
  

   g^. 
  Ventral 
  filaments 
  bifid. 
  

   h^. 
  Pectorals 
  simple; 
  preopercle 
  with 
  one 
  or 
  two 
  spines; 
  pyloric 
  coeca 
  

   large, 
  finger-like, 
  forming 
  a 
  ring 
  around 
  the 
  pylorus 
  and 
  extend- 
  

   ing 
  onto 
  neighboring 
  part 
  of 
  gut. 
  (Coloration 
  bright) 
  . 
  . 
  Neobythites. 
  

   h^. 
  Lower 
  pectoral 
  rays 
  detached; 
  angle 
  of 
  preopercle 
  with 
  three 
  small 
  

  

  spines; 
  pyloric 
  coeca 
  small 
  or 
  rudimentary 
  Dicrolene. 
  

  

  g^. 
  Ventral 
  filaments 
  entire. 
  

  

  •i*. 
  Lateral 
  line 
  terminating 
  posteriorly; 
  pyloric 
  coeca 
  10 
  to 
  12, 
  

   arranged 
  as 
  in 
  Neobythites. 
  

   j^. 
  Teeth 
  in 
  narrow 
  bands; 
  ventrals 
  longer 
  than 
  head 
  ; 
  pectorals 
  

   narrow, 
  of 
  about 
  21 
  rays; 
  preopercle 
  truncate, 
  without 
  a 
  

  

  distinct 
  incision 
  at 
  angle 
  Homostolus. 
  

  

  j^. 
  Teeth 
  in 
  broad 
  bands; 
  ventrals 
  reduced; 
  pectorals 
  with 
  25 
  

   to 
  28 
  rays; 
  preopercle 
  rounded, 
  Neobythites-\ike, 
  with 
  a 
  

  

  distinct 
  incision 
  on 
  upper 
  angle 
  Monomitopus. 
  

  

  i"^. 
  Lateral 
  line 
  terminating 
  mesially; 
  pyloric 
  coeca 
  more 
  rudi- 
  

   mentary, 
  about 
  five 
  Monomeropus. 
  

  

  p. 
  Lateral 
  line 
  indistinct, 
  rudimentary 
  or 
  absent. 
  

  

  B. 
  Head 
  with 
  prominent, 
  outstanding 
  crests, 
  which 
  are 
  

   almost 
  membranaceous 
  in 
  character; 
  preopercle 
  un- 
  

   armed, 
  rounded; 
  pseudobranchiae 
  rudimentary. 
  

  

  