﻿394 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.96 
  

  

  44795) 
  from 
  Rangoon 
  that 
  I 
  refer 
  to 
  this 
  genus. 
  From 
  petardi 
  it 
  

   differs 
  in 
  the 
  greater 
  development 
  of 
  the 
  preorbital 
  spines. 
  

  

  HETEROMUGIL, 
  new 
  genus 
  

  

  Genotype. 
  — 
  Mugil 
  tricuspidens 
  J. 
  L. 
  B. 
  Smith. 
  

  

  This 
  new 
  genus 
  of 
  Miigihdae 
  is 
  a 
  Chelon 
  with 
  trifid 
  and 
  rarely 
  bifid 
  

   teeth 
  in 
  the 
  upper 
  lip 
  in 
  a 
  single 
  row, 
  as 
  observed 
  on 
  specimens 
  60 
  mm. 
  

   and 
  longer. 
  These 
  teeth 
  are 
  setiform, 
  incisorlike, 
  and 
  close-set. 
  

   The 
  lower 
  lip 
  is 
  moderately 
  thin 
  with 
  embedded 
  ciliform 
  teeth. 
  It 
  

   has 
  the 
  maxillary 
  exposed 
  beyond 
  and 
  belov/ 
  the 
  preorbital; 
  the 
  

   pre 
  maxillary 
  is 
  sharply 
  angular, 
  extending 
  behind 
  the 
  maxillary 
  bone 
  

   which 
  turns 
  downward; 
  the 
  upper 
  lip 
  is 
  thick 
  and 
  wide, 
  wider 
  than 
  the 
  

   distance 
  between 
  nostrils 
  ; 
  the 
  posterior 
  edge 
  of 
  the 
  preorbital 
  is 
  wider 
  

   than 
  the 
  space 
  between 
  nostrils, 
  and 
  the 
  anterior 
  nostril 
  is 
  much 
  closer 
  

   to 
  the 
  posterior 
  one 
  than 
  to 
  the 
  groove 
  separating 
  upper 
  lip 
  and 
  snout 
  ; 
  

   no 
  adipose 
  eyelid 
  is 
  developed 
  ; 
  there 
  are 
  patches 
  of 
  villiform 
  teeth 
  on 
  

   the 
  pterygoids, 
  vomer, 
  and 
  tongue; 
  other 
  characters 
  are 
  those 
  of 
  the 
  

   genotype 
  Mugil 
  tricuspidens. 
  

  

  This 
  new 
  genus 
  differs 
  from 
  all 
  other 
  genera 
  of 
  Alugilidae 
  as 
  dis- 
  

   tinguished 
  in 
  the 
  key, 
  pages 
  379 
  to 
  381. 
  

  

  I 
  have 
  examined 
  one 
  specimen, 
  a 
  paiatype 
  of 
  Mugil 
  tricuspidens 
  

   J. 
  L. 
  B. 
  Smith 
  (U. 
  S. 
  N. 
  M. 
  No. 
  93651) 
  from 
  Mazeppa 
  Bay, 
  South 
  

   Africa. 
  Specimens 
  shorter 
  than 
  60 
  mm. 
  have 
  not 
  been 
  collected 
  

   according 
  to 
  Dr. 
  J. 
  L. 
  B. 
  Smith. 
  

  

  Named 
  Heteromugil 
  in 
  reference 
  to 
  the 
  distinguishing 
  (i. 
  e., 
  different) 
  

   teeth, 
  with 
  trifid 
  or 
  bifid 
  tips. 
  

  

  