﻿10 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.98 
  

  

  22a. 
  Scales 
  on 
  dorsal 
  surface 
  of 
  head 
  reversed 
  in 
  imbrication 
  as 
  far 
  

   posteriorly 
  as 
  a 
  line 
  connecting 
  across 
  rear 
  of 
  orbits 
  ; 
  base 
  of 
  

   last 
  ray 
  of 
  dorsal 
  a 
  little 
  behind 
  base 
  of 
  last 
  anal 
  ray 
  ; 
  scales 
  

   small, 
  in 
  very 
  numerous 
  rows 
  ; 
  a 
  small 
  patch 
  of 
  teeth 
  at 
  head 
  

   of 
  vomer 
  sometimes 
  present 
  ; 
  teeth 
  in 
  jaws 
  in 
  a 
  band, 
  outer 
  

   row 
  slightly 
  enlarged 
  ; 
  vertebrae 
  in 
  two 
  counts 
  26 
  to 
  29+21 
  

   (Peru 
  and 
  Chile 
  in 
  streams 
  and 
  probably 
  in 
  salt 
  waters). 
  

  

  Basilichthys 
  Girard 
  

  

  226. 
  Scales, 
  if 
  present, 
  on 
  dorsal 
  surface 
  of 
  head 
  not 
  reversed 
  in 
  

  

  imbrication, 
  but 
  normal 
  ; 
  base 
  of 
  last 
  ray 
  of 
  second 
  dorsal 
  about 
  

  

  over 
  base 
  of 
  first 
  to 
  third 
  from 
  last 
  anal 
  rays. 
  

  

  23o. 
  Teeth 
  conical-pointed, 
  in 
  two 
  or 
  three 
  rows 
  on 
  jaws; 
  first 
  

  

  dorsal 
  of 
  VII 
  to 
  IX 
  spines; 
  snout 
  somewhat 
  pointed, 
  jaws 
  

  

  about 
  equal; 
  vertebrae 
  in 
  one 
  count 
  33-fl8 
  (California 
  to 
  

  

  Baja 
  California 
  in 
  salt 
  water) 
  Atherinopsls 
  Girard 
  

  

  23&. 
  Teeth 
  with 
  bifid 
  tips, 
  in 
  a 
  single 
  row 
  on 
  jaws; 
  first 
  dorsal 
  

   of 
  IV 
  to 
  VII 
  spines 
  ; 
  tip 
  of 
  snout 
  broadly 
  rounded, 
  extending 
  

   a 
  little 
  in 
  front 
  of 
  upper 
  lip, 
  so 
  that 
  tip 
  of 
  snout 
  is 
  a 
  little 
  

   anterior 
  to 
  bifid 
  teeth 
  ; 
  vertebrae 
  in 
  one 
  count 
  28+20 
  

   (coasts 
  from 
  Oregon 
  to 
  Baja 
  California 
  and 
  offshore 
  is- 
  

   lands 
  ; 
  also 
  Gulf 
  of 
  California 
  ) 
  Atherinops 
  Steindachner 
  

  

  17&. 
  Air 
  bladder 
  not 
  tapering 
  to 
  a 
  point 
  posteriorly 
  and 
  not 
  extending 
  

   into 
  five 
  or 
  more 
  of 
  the 
  haemal 
  arches, 
  the 
  latter 
  not 
  modified 
  

   as 
  above 
  [sometimes 
  extent 
  of 
  body 
  cavity 
  may 
  be 
  observed 
  by 
  

   placing 
  fish 
  in 
  front 
  of 
  a 
  very 
  bright 
  light] 
  ; 
  vertebrae 
  about 
  13 
  

  

  to 
  23+18 
  to 
  27 
  (subfamily 
  Menidiinae) 
  

  

  24a. 
  Posterior 
  end 
  of 
  body 
  cavity 
  extending 
  to 
  opposite 
  anal 
  origin 
  

   or 
  well 
  past 
  anal-fin 
  origin 
  ; 
  air 
  bladder 
  not 
  extending 
  past 
  second 
  

   haemal 
  arch. 
  

   25a. 
  Anus 
  far 
  in 
  advance 
  of 
  anal-fin 
  origin, 
  as 
  close 
  to 
  or 
  closer 
  

   to 
  pelvic 
  bases 
  than 
  to 
  anal 
  origin 
  ; 
  scales 
  not 
  lacking 
  on 
  

   head 
  or 
  on 
  body 
  ; 
  a 
  sheath 
  of 
  scales, 
  anteriorly 
  at 
  least, 
  

   along 
  base 
  of 
  anal 
  fin 
  ; 
  first 
  dorsal 
  origin 
  over 
  or 
  slightly 
  

   in 
  advance 
  of 
  anal 
  origin 
  ; 
  pelvic 
  insertions 
  equidistant 
  

   between 
  anal 
  origin 
  and 
  upper 
  angle 
  of 
  pectoral 
  fin 
  base 
  ; 
  

   maxillary 
  not 
  quite 
  extending 
  to 
  a 
  vertical 
  line 
  through 
  an- 
  

   terior 
  margin 
  of 
  eye; 
  teeth 
  of 
  outer 
  series 
  stronger 
  and 
  

   more 
  regular 
  than 
  inner 
  series 
  ; 
  when 
  mouth 
  is 
  closed 
  outer 
  

   premaxillary 
  teeth 
  somewhat 
  exposed 
  and 
  directed 
  outward 
  ; 
  

   dorsal 
  and 
  anal 
  fins 
  falcate; 
  vertebrae 
  in 
  one 
  count 
  22+18; 
  

   ascending 
  process 
  of 
  premaxillary 
  a 
  short, 
  broad-based 
  tri- 
  

   angular 
  plate, 
  meeting 
  along 
  midline; 
  no 
  glandularlike 
  de- 
  

   pressions 
  on 
  dorsal 
  surface 
  of 
  snout 
  ; 
  axillary 
  scale 
  of 
  pelvic 
  

   fins 
  well 
  developed 
  ; 
  margins 
  of 
  scales 
  entire 
  or 
  slightly 
  scal- 
  

   loped 
  ; 
  scales 
  40 
  to 
  42; 
  dorsal 
  rays 
  IV 
  or 
  V 
  — 
  I, 
  1, 
  8 
  or 
  9; 
  

   anal 
  rays 
  I, 
  i, 
  16 
  to 
  18 
  (east-coast 
  streams 
  of 
  central 
  Mexico). 
  

  

  Archomenidia 
  Jordan 
  and 
  Hubbs 
  

   256. 
  Anus 
  usually 
  just 
  in 
  front 
  of 
  anal-fin 
  origin, 
  always 
  closer 
  to 
  

   anal 
  origin 
  than 
  to 
  pelvic 
  fin 
  bases. 
  

   26a. 
  Scales 
  lacking 
  on 
  head, 
  on 
  shoulder 
  girdle 
  in 
  front 
  of 
  pec- 
  

   toral 
  fin 
  base, 
  and 
  on 
  anterior 
  part 
  of 
  body, 
  except 
  a 
  few 
  

   rows 
  may 
  extend 
  forward 
  a 
  little 
  between 
  the 
  naked 
  areas 
  ; 
  

   ascending 
  premaxillary 
  process 
  a 
  broad-based 
  triangular 
  

  

  