﻿392 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.96 
  

  

  The 
  genus 
  Chelon 
  Rose 
  is 
  characterized 
  by 
  the 
  thiii-edged 
  lower 
  

   lip 
  projecting 
  forward 
  horizontally, 
  not 
  cui'ved 
  or 
  folded 
  downward; 
  

   the 
  lower 
  lip 
  is 
  made 
  up 
  of 
  ciliform 
  teeth 
  embedded 
  in 
  the 
  lip, 
  none 
  

   of 
  which 
  project 
  beyond 
  the 
  flesh 
  of 
  the 
  lip; 
  in 
  the 
  upper 
  lip 
  the 
  

   setiform 
  teeth 
  project 
  beyond 
  the 
  lip; 
  tips 
  of 
  all 
  teeth 
  simple, 
  none 
  

   bifid 
  or 
  trifid 
  even 
  in 
  large 
  adults 
  ; 
  behind 
  outer 
  row 
  of 
  setiform 
  teeth 
  

   in 
  upper 
  lip 
  occm* 
  minute 
  teeth 
  in 
  one 
  or 
  more 
  rows, 
  all 
  with 
  simple 
  

   tips; 
  a 
  symphyseal 
  knob 
  at 
  tip 
  of 
  lower 
  jaw; 
  scales 
  cycloid; 
  the 
  pre- 
  

   orbital 
  has 
  a 
  concave 
  notch 
  or 
  shallow 
  concavity 
  in 
  its 
  front 
  margin 
  

   to 
  accommodate 
  the 
  exposed 
  maxillary, 
  which 
  is 
  hooked 
  or 
  bent 
  down- 
  

   ward 
  ; 
  the 
  premaxillary 
  is 
  also 
  bent 
  posteriorly 
  at 
  a 
  more 
  or 
  less 
  sharp 
  

   angle, 
  the 
  posterior 
  part 
  of 
  this 
  bone 
  lying 
  behind 
  the 
  maxillary; 
  

   the 
  nostrils 
  are 
  on 
  the 
  level 
  of 
  the 
  upper 
  edge 
  of 
  the 
  orbit 
  and 
  are 
  

   close 
  together, 
  usually 
  closer 
  to 
  each 
  other 
  than 
  anterior 
  is 
  from 
  

   groove 
  behind 
  upper 
  lip; 
  no 
  adipose 
  eyelid 
  present; 
  upper 
  lip 
  wider 
  

   than 
  distance 
  between 
  nostrils; 
  teeth 
  on 
  vomer, 
  palatines, 
  and 
  tongue 
  

   present 
  or 
  absent; 
  the 
  posterior 
  edge 
  of 
  the 
  preorbital 
  is 
  wider 
  than 
  

   the 
  space 
  between 
  the 
  nostrils; 
  margin 
  of 
  lower 
  jaw 
  angular; 
  gill 
  

   membranes 
  extending 
  far 
  forward, 
  not 
  broadly 
  connected 
  across 
  

   isthmus. 
  

  

  The 
  collections 
  referred 
  to 
  this 
  genus 
  are 
  too 
  numerous 
  in 
  the 
  Na- 
  

   tional 
  Museum 
  to 
  list 
  here, 
  but 
  they 
  came 
  from 
  the 
  following 
  localities 
  

   in 
  the 
  Pacific: 
  Marquesas 
  Islands, 
  PhoenLx 
  Islands, 
  New 
  Hebrides, 
  

   Sumatra, 
  Java, 
  Roual, 
  Samoan 
  Islands, 
  Tahiti, 
  New 
  Guinea, 
  Christ- 
  

   mas 
  Island, 
  Marshall 
  Islands, 
  Solomon 
  Islands, 
  Celebes, 
  and 
  Phil- 
  

   ippine 
  Islands, 
  China 
  coast, 
  Japan, 
  Korea, 
  Peter 
  the 
  Great 
  Bay, 
  and 
  

   New 
  South 
  Wales, 
  Australia. 
  In 
  the 
  Atlantic: 
  Europe, 
  British 
  Isles, 
  

   Norway, 
  Azores, 
  and 
  Canjiry 
  Islands. 
  Other 
  localities: 
  Mediter- 
  

   ranean 
  Sea, 
  Island 
  of 
  Mauritius, 
  Burma 
  and 
  India, 
  British 
  East 
  

   Africa, 
  British 
  South 
  Africa, 
  and 
  French 
  Congo, 
  Africa. 
  

  

  I 
  did 
  not 
  find 
  any 
  specimen 
  from 
  the 
  New 
  World 
  that 
  was 
  referable 
  

   to 
  this 
  apparently 
  Old 
  World 
  genus. 
  

  

  Genus 
  TRACHYSTOMA 
  Ogilby 
  

  

  Figure 
  31, 
  a-c 
  

  

  Trachysloma 
  Ogilby, 
  Proc. 
  Zool. 
  Soc, 
  London, 
  1887, 
  p. 
  614 
  (genotype, 
  Trachy- 
  

   sioma 
  multidens 
  Ogilby) 
  (Port 
  Stevens 
  at 
  mouth 
  of 
  Keruah 
  River) 
  ( 
  = 
  Mtigil 
  

   breviceps 
  Steindachner=MwgfiZ 
  petardi 
  Castelnau). 
  

  

  Sicamugil 
  Fowler, 
  Not. 
  Nat., 
  No. 
  17, 
  p. 
  9, 
  fig. 
  1, 
  1939 
  (genotype, 
  Mugil 
  hamiltoni 
  

   Day) 
  (fresh 
  waters 
  of 
  Burma). 
  

  

  Gracilimugil 
  Whitley, 
  Australian 
  Zool., 
  vol. 
  10, 
  pt. 
  1, 
  p. 
  19, 
  fig. 
  14, 
  1941 
  (geno- 
  

   type, 
  Grac.ilimugil 
  ramsayi 
  (Macleay) 
  = 
  Mwgri7 
  ramsayi 
  Macleay, 
  1883) 
  

   (Burdekin 
  River, 
  Queensland). 
  

  

  Although 
  I 
  have 
  not 
  seen 
  a 
  specimen 
  of 
  Gracilimugil 
  ramsayi 
  

   (Macleay) 
  I 
  am 
  unable 
  to 
  find 
  any 
  statement 
  in 
  Whitley's 
  diagnosis 
  

   that 
  definitely 
  separates 
  it 
  from 
  Trachy 
  stoma. 
  

  

  