﻿72 
  Description 
  of 
  the 
  Selene 
  Argentea 
  of 
  Lacepede^ 
  

  

  and 
  I9O2 
  millimetres 
  respectively, 
  measuring 
  from 
  snout 
  to 
  

   centre 
  of 
  margin 
  of 
  caudal. 
  

  

  Locality: 
  coast 
  of 
  United 
  States 
  from 
  New- 
  York 
  southerly, 
  

   "West-Indies, 
  and 
  probably 
  eastern 
  coast 
  of 
  Brazil. 
  One 
  cap- 
  

   tured 
  near 
  New- 
  York, 
  October 
  6th, 
  1849. 
  Flesh 
  firm, 
  oily, 
  

   and 
  mackerel-like. 
  

  

  Formula 
  of 
  fin 
  rays 
  : 
  B 
  : 
  7 
  P 
  : 
  18 
  V 
  : 
  I. 
  5 
  D 
  : 
  

  

  YIII— 
  I. 
  22 
  A 
  : 
  II— 
  I. 
  19 
  C 
  : 
  ,-9 
  | 
  8-6 
  or 
  , 
  ] 
  17 
  | 
  «. 
  

  

  Particular 
  Description. 
  — 
  Head 
  recalls 
  that 
  oi 
  Argyreiosus 
  in 
  height 
  and 
  out- 
  

   line. 
  Facial 
  outline 
  very 
  slightly 
  incurved. 
  Lower 
  jaw 
  even 
  Vi^ith 
  the 
  upper. 
  

   Teeth 
  very 
  small, 
  forming 
  a 
  narrow 
  band 
  along 
  each 
  jaw 
  nearly 
  to 
  the 
  commissure. 
  

   Vomer 
  and 
  pharyngeals 
  furnished 
  with 
  small 
  teeth. 
  Tongue 
  pointed, 
  and 
  with 
  a 
  

   narrow 
  band 
  of 
  small 
  teeth 
  along 
  its 
  middle 
  line. 
  A 
  valvular 
  membrane 
  inside 
  of 
  

   the 
  anterior 
  portion 
  of 
  each 
  jaw. 
  Upper 
  jaw 
  protractile. 
  A 
  deep 
  and 
  narrow 
  

   emargination 
  between 
  the 
  first 
  suborbitals 
  above 
  the 
  tip 
  of 
  the 
  upper 
  jaw, 
  into 
  which 
  

   the 
  intermaxillary 
  processes 
  fit 
  when 
  in 
  repose. 
  Nostrils 
  as 
  usual, 
  double, 
  in 
  front 
  

   of 
  the 
  lower 
  half 
  of 
  the 
  eye, 
  the 
  upper 
  and 
  posterior 
  one 
  being 
  half 
  way 
  between 
  

   the 
  eye 
  and 
  facial 
  line. 
  Eyes 
  large, 
  round, 
  distant 
  a 
  little 
  less 
  than 
  their 
  diameter 
  

   from 
  the 
  facial 
  line, 
  two 
  and 
  a 
  half 
  times 
  the 
  same 
  from 
  the 
  tip 
  of 
  the 
  opercle, 
  and 
  

   equidistant 
  from 
  the 
  occiput 
  and 
  tip 
  of 
  lower 
  jaw. 
  First 
  suborbitals 
  very 
  much 
  

   developed, 
  extending 
  from 
  the 
  eye 
  to 
  the 
  jaw, 
  where, 
  at 
  the 
  back 
  part 
  of 
  the 
  lower 
  

   margin, 
  they 
  slightly 
  cover 
  the 
  maxillaries, 
  and 
  show 
  delicate 
  radiated 
  lines. 
  The 
  

   other 
  suborbitals 
  are 
  narrow, 
  and 
  follow 
  the 
  outline 
  of 
  the 
  eye. 
  

  

  Preopercles 
  high 
  and 
  narrow, 
  their 
  posterior 
  margin 
  rounded, 
  and 
  forming 
  an 
  

   angle 
  of 
  about 
  140°. 
  Margin 
  above 
  the 
  angle 
  slightly 
  incurved, 
  below 
  it 
  curving 
  

   outwards. 
  Opercles 
  high, 
  with 
  a 
  broadly 
  rounded 
  angle 
  about 
  equal 
  to 
  that 
  of 
  the 
  

   preopercle, 
  emarginated 
  above 
  so 
  as 
  to 
  present 
  a 
  second 
  rounded 
  point, 
  with 
  finely 
  

   radiated 
  lines 
  along 
  the 
  angle. 
  Below, 
  the 
  margin 
  is 
  nearly 
  straight. 
  Its 
  width 
  

   nearly 
  equal 
  to 
  diameter 
  of 
  eyes. 
  Interopercle 
  long 
  and 
  narrow, 
  broadest 
  below. 
  

   Subopercle 
  nearly 
  parallel 
  to 
  preopercle. 
  Besides 
  several 
  small 
  raised 
  lines 
  about 
  

   the 
  eye, 
  there 
  is 
  one, 
  well 
  marked 
  and 
  in 
  strong 
  relief, 
  rising 
  from 
  the 
  upper 
  end 
  of 
  

   the 
  preopercle 
  ; 
  this 
  extends 
  upwards 
  with 
  a 
  double 
  curve, 
  and, 
  approaching 
  the 
  

   occiput, 
  it 
  becomes 
  nearly 
  parallel 
  to 
  the 
  dorsal 
  outline, 
  giving 
  out 
  several 
  branches 
  

   on 
  its 
  way, 
  and 
  becoming 
  finer 
  until 
  lost 
  half 
  way 
  between 
  the 
  occiput 
  and 
  first 
  

   dorsal. 
  

  

  The 
  two 
  first 
  bones 
  of 
  the 
  humeral 
  arch, 
  seen 
  outside 
  behind 
  the 
  opercle, 
  form 
  

   the 
  corselet, 
  as 
  in 
  other 
  scomberoids. 
  

  

  The 
  lateral 
  line 
  starts 
  from 
  the 
  junction 
  of 
  the 
  posterior 
  edges 
  of 
  these 
  bones, 
  

   and, 
  giving 
  out 
  a 
  few 
  short 
  branches 
  on 
  each 
  side, 
  curves 
  boldly 
  upwards, 
  forming 
  

   very 
  nearly 
  the 
  segment 
  of 
  a 
  circle, 
  whose 
  radius 
  equals 
  one 
  fifth 
  of 
  the 
  height 
  of 
  

   the 
  body, 
  extending 
  thus 
  about 
  150° 
  around 
  its 
  centre, 
  and 
  in 
  its 
  course 
  making 
  

   several 
  slight 
  undulations, 
  the 
  surface 
  of 
  the 
  body 
  below 
  each 
  of 
  them 
  being 
  slightly 
  

   raised, 
  giving 
  it 
  a 
  peculiar 
  corrugated 
  appearance. 
  Having 
  formed 
  the 
  above 
  arc, 
  

  

  