﻿yEW 
  BROTULID 
  AND 
  CARAPID 
  FISHES— 
  RADCLIFFE. 
  137 
  

  

  IK 
  Pyloric 
  coeca 
  absent; 
  bones 
  of 
  head 
  soft 
  and 
  cavernous 
  

   without 
  large, 
  distinct 
  mucous 
  cavities 
  or 
  pores 
  with 
  

   a 
  heavy 
  covering 
  of 
  skin 
  which 
  covers 
  and 
  obscures 
  

   the 
  angles 
  of 
  the 
  skull; 
  pectorals 
  without 
  free 
  rays, 
  

   less 
  than 
  one-half 
  total 
  length. 
  

   m'. 
  Ventral 
  filaments 
  bifid. 
  

  

  n'. 
  Snout 
  much 
  produced 
  and 
  dilated 
  ; 
  body 
  very 
  short, 
  

  

  deep 
  and 
  compressed 
  Baraihrodemus. 
  

  

  n^. 
  Snout 
  not 
  gi-eatly 
  produced 
  and 
  dilated; 
  body 
  

   elongate. 
  

   0^ 
  Teeth 
  in 
  villiform 
  bands; 
  eye 
  distinct, 
  not 
  deep- 
  

   set; 
  body 
  not 
  anguilliform 
  Bassogigas. 
  

  

  0^. 
  Teeth 
  in 
  a 
  single 
  row; 
  eye 
  deep-set; 
  body 
  anguilli- 
  

   form 
  Enchelyhrotula 
  . 
  

  

  m^. 
  Ventral 
  filaments 
  simple. 
  

  

  pK 
  Head 
  relatively 
  low, 
  bones 
  of 
  skull 
  obscure; 
  

   lower 
  half 
  of 
  pectoral 
  produced, 
  rigid, 
  oar- 
  

   like 
  Eretmichthys. 
  

  

  p-. 
  Head 
  strongly 
  arched 
  posteriorly, 
  bones 
  of 
  

   skull 
  quite 
  distinct, 
  the 
  scales 
  covering 
  it 
  

   deciduous; 
  pectorals 
  unmodified. 
  

  

  ■ 
  Bassozetus. 
  

  

  P. 
  Rudimentary 
  pyloric 
  coeca 
  present; 
  head 
  massive 
  with 
  

   distinct 
  mucous 
  cavities 
  or 
  pores; 
  angles 
  of 
  skull 
  not 
  

   obscured 
  by 
  thick, 
  heavy 
  skin. 
  

  

  q^. 
  Ventral 
  filaments 
  simple; 
  two 
  lower 
  pectoral 
  

   rays 
  differentiated; 
  pseudo 
  branchiae 
  small, 
  

  

  rudimentary 
  Mixonus. 
  

  

  q-. 
  Ventral 
  filaments 
  bifid; 
  pectorals 
  produced 
  

   into 
  a 
  long, 
  whip-like 
  organ, 
  without 
  de- 
  

   tached 
  rays; 
  pseudobranchise 
  absent, 
  

  

  Mastigopterus. 
  

  

  P. 
  Head 
  with 
  prominent 
  outstanding 
  crests, 
  covered 
  with 
  

   deciduous 
  scales; 
  pseudobranchi^ 
  well 
  developed 
  ; 
  ven- 
  

   tral 
  filaments 
  simple 
  or 
  bifid 
  Glyptophidium. 
  

  

  ^. 
  Lateral 
  line 
  very 
  broad, 
  with 
  an 
  inner 
  series 
  of 
  enlarged 
  plate-like 
  scales 
  

   covered 
  by 
  a 
  band 
  of 
  smaller 
  scales. 
  

  

  rK 
  Ventrals 
  absent; 
  head 
  with 
  outstanding 
  

   crests; 
  no 
  fang-like 
  canines; 
  parapophy- 
  

  

  ses 
  normal 
  Lamprogrammus. 
  

  

  r^. 
  Ventral 
  filaments 
  simple; 
  bones 
  of 
  head 
  

   firm; 
  fang-like 
  teeth 
  present; 
  parapophy- 
  

  

  ses 
  greatly 
  enlarged 
  Hypopleuron. 
  

  

  Bythitin^. 
  Head 
  naked 
  or 
  only 
  partially 
  scaled; 
  ventrals 
  present 
  or 
  

   absent; 
  small 
  cilia 
  often 
  present 
  on 
  naked 
  portion 
  of 
  head. 
  Species 
  as 
  

   far 
  as 
  known 
  viviparous. 
  

  

  s*. 
  Caudal 
  differentiated, 
  with 
  a 
  distinct 
  

  

  stem; 
  cheeks 
  scaly 
  Dinematichthys. 
  

  

  s^. 
  Caudal 
  not 
  differentiated. 
  

   V-. 
  Ventral 
  filaments 
  present; 
  preopercle 
  

   without 
  well-developed 
  spines; 
  three 
  

   developed 
  gill-rakers 
  on 
  first 
  arch. 
  

   it^. 
  Head 
  naked; 
  lateral 
  line 
  incomplete 
  

   or 
  absent; 
  body 
  elongate. 
  

  

  Diplacanthopoma 
  (Sarcocara)^ 
  

  

  