﻿332 
  Mr. 
  C. 
  T. 
  Regan 
  on 
  the 
  

  

  parapopliyses 
  to 
  which 
  the 
  ribs 
  are 
  attached. 
  Both 
  jaws 
  

   strongly 
  produced, 
  furnished 
  with 
  bands 
  of 
  small 
  teeth 
  and 
  

   with 
  a 
  single 
  series 
  of 
  more 
  or 
  less 
  strongly 
  enlarged, 
  erect, 
  

   conical, 
  pointed 
  teeth. 
  No 
  finlets. 
  

  

  Synopsis 
  of 
  the 
  Genera. 
  

  

  I. 
  Gill-rakers 
  developed 
  ; 
  jaws 
  comparatively 
  slender 
  ; 
  enlarged 
  teeth 
  

  

  of 
  upper 
  jaw 
  moderate, 
  of 
  lower 
  comparatively 
  small 
  and 
  close- 
  

   set 
  ; 
  lower 
  pharyngeal 
  triangular 
  ; 
  second 
  and 
  third 
  upper 
  pha- 
  

   ryngeals 
  dentigerous 
  ; 
  fourth 
  usually 
  distinct, 
  dentigerous. 
  

  

  Body 
  scarcely 
  or 
  moderately 
  compressed 
  . 
  1. 
  Belone, 
  Cuv., 
  1817 
  *. 
  

  

  Body 
  very 
  strongly 
  compressed 
  2. 
  Petalichthys, 
  Regan, 
  1904. 
  

  

  II. 
  Gill-rakers 
  absent 
  or 
  vestigial; 
  jaws 
  comparatively 
  stout 
  ; 
  enlarged 
  

  

  teeth 
  of 
  botli 
  jaws 
  strong, 
  spaced 
  canines. 
  

  

  A. 
  Dorsal 
  rays 
  suhequal 
  ; 
  lower 
  pharyngeal 
  triangular; 
  second, 
  

  

  third, 
  and 
  fourth 
  upper 
  pharyngeals 
  separate, 
  dentigerous. 
  

  

  3. 
  Botamorrhaphis, 
  Giinth., 
  

   [1866. 
  

  

  B. 
  Anterior 
  dorsal 
  rays 
  forming 
  a 
  lobe 
  ; 
  lower 
  pharyngeal 
  elon- 
  

  

  gate, 
  narrow, 
  the 
  dentigerous 
  plate 
  scarcely 
  expanded 
  poste- 
  

   riorly 
  ; 
  second 
  and 
  third 
  upper 
  pharyngeals 
  dentigerous 
  ; 
  fourth 
  

   usually 
  distinct, 
  dentigerous. 
  

  

  Body 
  scarcely 
  or 
  moderately 
  compressed 
  . 
  4. 
  Tylosurils, 
  Cocco, 
  1829. 
  

  

  Body 
  strongly 
  compressed 
  5. 
  Athle/mes, 
  Jord., 
  1886. 
  

  

  C. 
  Anterior 
  dorsal 
  rays 
  forming 
  a 
  lobe 
  ; 
  lower 
  pharyngeal 
  small, 
  

  

  narrow, 
  pointed 
  or 
  rounded 
  at 
  both 
  ends 
  ; 
  only 
  one 
  pair 
  of 
  

   dentigerous 
  upper 
  pharyngeals, 
  the 
  third. 
  

  

  6. 
  Xenentoclon, 
  gen. 
  nov. 
  

  

  I 
  have 
  examined 
  the 
  pharyngeal 
  dentition 
  in 
  the 
  following 
  

   species 
  : 
  — 
  Be/one 
  belone, 
  Linn., 
  acus, 
  Risso, 
  trachura, 
  Cuv. 
  & 
  

   Val., 
  platura, 
  Benn., 
  gracilis, 
  Lowe 
  ; 
  Petalichthys 
  capensis, 
  

   Regan 
  ; 
  Tylosurus 
  acus, 
  Lacep., 
  marinus, 
  Walb., 
  annulatus, 
  

   Cuv. 
  & 
  Val., 
  robustus, 
  Giinth., 
  caudimaculatus, 
  Cuv., 
  strongy- 
  

   lurus, 
  Bleek., 
  anastomella 
  , 
  Cuv. 
  & 
  Val. 
  ; 
  Athlennes 
  hians, 
  

   Cuv. 
  & 
  Val. 
  ; 
  Xenentoclon 
  cancila, 
  Buch. 
  Ham., 
  ca?iciloides 
  } 
  

   Bleek. 
  

  

  The 
  lower 
  pharyngeal 
  plate 
  of 
  Xenentodon 
  seems 
  to 
  be 
  

   derived 
  from 
  that 
  of 
  Tylosurus 
  by 
  the 
  constriction 
  off 
  of 
  the 
  

   anterior 
  part 
  and 
  disappearance 
  of 
  the 
  remainder. 
  

  

  * 
  According 
  to 
  the 
  synonymy 
  given 
  by 
  Dr. 
  Gill, 
  RapMstoma, 
  Rafinesque, 
  

   1815, 
  has 
  priority 
  over 
  Belone, 
  Cuv., 
  1817. 
  Rafinesque 
  (' 
  Analyse 
  de 
  la 
  

   Nature,' 
  p. 
  89j 
  placed 
  Mitphistoma 
  after 
  Esox 
  in 
  the 
  subfamily 
  Esoxidia 
  

   ("Une 
  seule 
  nageoire 
  dorsale; 
  dos 
  non 
  aguillonne") 
  of 
  the 
  family 
  Siagonia 
  

   (" 
  Machoirea 
  tres-prolongees, 
  dentees") 
  of 
  the 
  order 
  Gastripia 
  (" 
  Les 
  

   abdominaux 
  "). 
  The 
  only 
  generic 
  diagnosis 
  is 
  a 
  reference 
  to 
  Belone, 
  Gr. 
  

   [Gronovius]. 
  As 
  the 
  name 
  Belone 
  apparently 
  does 
  not 
  occur 
  in 
  the 
  

   writings 
  of 
  Gronovius, 
  Raphistoma 
  may 
  be 
  regarded 
  as 
  a 
  nomen 
  nudum. 
  

  

  