﻿44 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.98 
  

  

  Tentatively, 
  at 
  least, 
  I 
  refer 
  Atherina 
  jachsoniana 
  to 
  the 
  genus 
  

   A:u,stromenidia, 
  but 
  to 
  know 
  whicli 
  species 
  it 
  must 
  replace 
  in 
  that 
  

   genus 
  must 
  await 
  a 
  revision 
  of 
  Austrmnenidia 
  and 
  further 
  comparisons 
  

   of 
  the 
  types 
  of 
  A. 
  jacJcsoniaTia. 
  

  

  Genus 
  LEURESTHES 
  Jordan 
  and 
  Gilbert 
  

  

  Figures 
  M, 
  5a 
  

  

  Leuresthes 
  Jordan 
  and 
  Gilbeet, 
  Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  vol. 
  3, 
  p. 
  29, 
  1S80 
  (geno- 
  

   type: 
  Atherinopsis 
  tenuis 
  Ayres). 
  

  

  The 
  generic 
  description 
  in 
  the 
  key 
  is 
  based 
  on 
  numerous 
  specimens 
  

   of 
  the 
  genotype 
  from 
  California. 
  

  

  I 
  have 
  examined 
  the 
  two 
  types 
  of 
  Leuresthes 
  crameri 
  Jordan 
  and 
  

   Evermann, 
  U. 
  S. 
  N. 
  M. 
  No. 
  47583, 
  and 
  they 
  belong 
  in 
  this 
  genus 
  and 
  

   undoubtedly 
  are 
  the 
  same 
  species 
  as 
  L. 
  tenuis. 
  

  

  It 
  would 
  be 
  interesting 
  to 
  know 
  if 
  the 
  remarkable 
  development 
  of 
  

   the 
  air 
  bladder 
  in 
  this 
  genus 
  has 
  some 
  connection 
  to 
  the 
  close 
  correla- 
  

   tion 
  of 
  the 
  tidal 
  cycle 
  with 
  the 
  highly 
  specialized 
  spawning 
  habits 
  of 
  

   L. 
  tenuis, 
  so 
  fully 
  described 
  by 
  Dr. 
  W. 
  F. 
  Thompson 
  and 
  others. 
  

  

  Genus 
  ODONTESTHES 
  Evermann 
  and 
  Kendall 
  

  

  Figures 
  8, 
  9 
  

  

  Odontesthes 
  Evermann 
  and 
  Kendall, 
  Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  vol. 
  31, 
  p. 
  94, 
  fig. 
  3, 
  

   1906 
  (genotype: 
  Odontesthes 
  perugiae 
  Evermann 
  and 
  Kendall). 
  

  

  Kronia 
  Ribeiro, 
  Arch. 
  Mus. 
  Nac. 
  Rio 
  de 
  Janeiro, 
  vol. 
  17, 
  Trematolepides, 
  p. 
  9, 
  

   1915 
  (genotype: 
  Kronia 
  iguapensis 
  Ribeiro). 
  

  

  Pseudotliyrina 
  Ribeiro, 
  Arch. 
  Mus. 
  Nac. 
  Rio 
  de 
  Janeiro, 
  vol. 
  17, 
  Trematolepides, 
  

   p. 
  11, 
  1915 
  (genotype: 
  Pseudotliyrina 
  iheringi 
  Ribeiro). 
  

  

  The 
  generic 
  diagnosis 
  is 
  based 
  upon 
  numerous 
  specimens 
  in 
  the 
  

   following 
  lots 
  in 
  the 
  National 
  collections 
  : 
  The 
  holotype 
  of 
  Odontesthes 
  

   perugiae, 
  U. 
  S. 
  N. 
  M. 
  No. 
  55572 
  ; 
  U. 
  S. 
  N. 
  M. 
  No. 
  126660, 
  another 
  speci- 
  

   men 
  of 
  perugiae; 
  and 
  U. 
  S. 
  N. 
  M. 
  Nos. 
  1706, 
  55581, 
  77297, 
  84468, 
  122862, 
  

   which 
  probably 
  are 
  specimens 
  of 
  honarlensis 
  or 
  of 
  a 
  closely 
  related 
  

   species. 
  Certain 
  specimens 
  of 
  the 
  last-named 
  species 
  have 
  the 
  denti- 
  

   tion 
  variable 
  on 
  the 
  vomer, 
  either 
  present 
  or 
  absent, 
  and 
  I 
  can 
  find 
  no 
  

   good 
  reason 
  why 
  Kronia 
  igtiapensis 
  Ribeiro 
  is 
  not 
  honariensis 
  or 
  at 
  

   least 
  a 
  closely 
  related 
  species, 
  the 
  status 
  of 
  which 
  cannot 
  be 
  determined 
  

   until 
  the 
  types 
  of 
  Ribeiro's 
  species 
  are 
  reexamined. 
  The 
  dentition 
  of 
  

   the 
  jaws 
  in 
  O. 
  perugiae 
  consists 
  of 
  two 
  widely 
  spaced 
  rows 
  of 
  teeth, 
  

   but 
  in 
  the 
  material 
  listed 
  above 
  and 
  referred 
  to 
  honariensis 
  the 
  teeth 
  

   are 
  variable, 
  the 
  two 
  rows 
  in 
  some 
  specimens 
  as 
  in 
  perugiae 
  but 
  in 
  

   others 
  irregular, 
  and 
  even 
  a 
  third 
  irregular 
  row 
  occurs 
  between 
  the 
  

   two 
  outer 
  rows. 
  The 
  pikelike 
  or 
  pointed 
  snout 
  of 
  perugiae 
  is 
  less 
  

   pointed 
  in 
  honariensis, 
  even 
  somewhat 
  rounded 
  in 
  some 
  specimens. 
  

   Because 
  of 
  the 
  overlapping 
  of 
  characters 
  between 
  the 
  two 
  kinds 
  of 
  

  

  