﻿386 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.96 
  

  

  Genus 
  NEOMYXUS 
  Steindachner 
  

  

  Neomyxus 
  Steindachner, 
  Ichthyologische 
  Beitrage 
  (VII), 
  Sitz. 
  Akad. 
  Wiss. 
  

   Wien, 
  vol. 
  78, 
  p. 
  384, 
  1878 
  (genotype, 
  Myxus 
  {Neomyxus) 
  sclateri 
  Steindach- 
  

   ner) 
  (Kingsmill 
  and 
  Sandwich 
  Islands). 
  

  

  This 
  genus 
  is 
  characterized 
  by 
  the 
  thick 
  phable 
  hps 
  bearing 
  exter- 
  

   nally 
  two 
  or 
  three 
  rows 
  of 
  characteristically 
  shaped, 
  3-pointed 
  or 
  

   trifid 
  setiform 
  teeth 
  on 
  both 
  jaws; 
  lower 
  lip 
  with 
  teeth 
  and 
  folded 
  

   downward 
  and 
  fitting 
  snugly 
  behind 
  the 
  upper 
  lip 
  when 
  mouth 
  is 
  

   closed; 
  tip 
  of 
  lower 
  jaw 
  bluntly 
  pointed 
  with 
  symphyseal 
  knob 
  small 
  

   and 
  located 
  internally 
  ; 
  scales 
  cycloid 
  ; 
  front 
  edge 
  of 
  preorbital 
  straight 
  

   without 
  convacity, 
  serrated 
  anteriorly; 
  maxillary 
  and 
  premaxillary 
  

   not 
  bent 
  downward 
  posteriorly; 
  nostrils 
  in 
  line 
  with 
  upper 
  edge 
  of 
  

   orbit, 
  moderately 
  close 
  together, 
  the 
  anterior 
  nostril 
  remote 
  from 
  

   groove 
  behind 
  upper 
  lip 
  ; 
  adipose 
  eyelid 
  absent 
  ; 
  no 
  teeth 
  on 
  vomer 
  or 
  

   palatines 
  but 
  probably 
  some 
  on 
  the 
  tongue; 
  posterior 
  edge 
  of 
  preor- 
  

   bital 
  wide, 
  and 
  serrated; 
  margin 
  of 
  lower 
  jaw 
  acutely 
  angular; 
  gill 
  

   membranes 
  extending 
  far 
  forward, 
  not 
  broadly 
  connected 
  across 
  the 
  

   isthmus. 
  

  

  I 
  have 
  studied 
  the 
  followmg 
  collections 
  in 
  the 
  United 
  States 
  Na- 
  

   tional 
  Museum: 
  Niuafau 
  Island, 
  U. 
  S. 
  N. 
  M. 
  Nos. 
  91854-6, 
  91858-9, 
  

   and 
  91983; 
  Phoenix 
  Islands, 
  Nos. 
  115629 
  and 
  115632; 
  Swains 
  Island, 
  

   Nos. 
  115627-8 
  and 
  115631; 
  Wake 
  Island, 
  No. 
  82893; 
  Makemo 
  Island, 
  

   No. 
  65969; 
  Baker 
  Island, 
  No. 
  88153; 
  Guam 
  Island, 
  No. 
  65968; 
  Ellis 
  

   Island, 
  No. 
  65967; 
  Tongareva 
  Island, 
  No. 
  88152; 
  Manga 
  Riva 
  Island, 
  

   No. 
  65596; 
  Marquesas 
  Islands, 
  Nos. 
  89744-5; 
  Hawaiian 
  Islands, 
  

   Nos. 
  52772, 
  55433, 
  55434, 
  55439, 
  55475, 
  55488, 
  55525, 
  82867, 
  89532, 
  

   115630, 
  and 
  126540. 
  These 
  specimens 
  all 
  came 
  from 
  the 
  central 
  

   tropical 
  Pacific 
  Ocean 
  or 
  Oceania. 
  

  

  XENOMUGIL, 
  new 
  genus 
  

  

  Genotype. 
  — 
  Mugil 
  thoburvi 
  Jordan 
  and 
  Starks, 
  in 
  Jordan 
  and 
  Ever- 
  

   mann, 
  U. 
  S. 
  Nat. 
  Mus. 
  Bull. 
  47, 
  pt. 
  1, 
  p. 
  812, 
  1896 
  (types, 
  U. 
  S. 
  N. 
  M. 
  

   No. 
  47576, 
  Galapagos 
  Islands). 
  

  

  This 
  genus 
  is 
  characterized 
  by 
  thick 
  lips 
  in 
  both 
  jaws, 
  each 
  bearing, 
  

   externally, 
  a 
  uniserial 
  row 
  or 
  in 
  two 
  rows 
  anteriorly 
  of 
  setiform 
  teeth 
  

   with 
  unbranched 
  tips; 
  lower 
  lip 
  folded 
  downward 
  and 
  fitting 
  snugly 
  

   behind 
  the 
  upper 
  lip 
  when 
  mouth 
  is 
  closed, 
  tip 
  of 
  lower 
  jaw 
  bluntly 
  

   pointed, 
  with 
  a 
  small 
  symphyseal 
  laiob 
  somewhat 
  developed 
  behind 
  

   tip 
  of 
  jaw; 
  scales 
  cycloid; 
  front 
  edge 
  of 
  preorbital 
  straight 
  without 
  

   concavity 
  and 
  serrated; 
  maxillary 
  and 
  premaxillary 
  not 
  bent 
  down- 
  

   ward 
  posteriorly; 
  nostrils 
  in 
  line 
  with 
  upper 
  edge 
  of 
  orbit 
  widely 
  

   separated, 
  the 
  anterior 
  one 
  as 
  close 
  to 
  groove 
  behind 
  upper 
  lip 
  as 
  to 
  

   posterior 
  nostril; 
  adipose 
  eyelid 
  present, 
  well 
  developed 
  on 
  adult; 
  no 
  

   teeth 
  on 
  vomer 
  or 
  palatines 
  but 
  probably 
  a 
  few 
  on 
  the 
  tongue; 
  pos- 
  

  

  