﻿PROCEEDINGS 
  OF 
  THE 
  NATIONAL, 
  MUSEUM 
  

  

  vol. 
  67 
  

  

  KEY 
  TO 
  KNOWN 
  ZOEAS 
  

  

  a. 
  1 
  Exopodite 
  of 
  antenna 
  minute. 
  

  

  b. 
  1 
  Distal 
  third 
  of 
  antenna 
  smooth 
  Neopanope 
  texana 
  sayi. 
  

  

  ft. 
  2 
  Distal 
  third 
  of 
  antenna 
  hairy. 
  

  

  c. 
  1 
  Antennule 
  bearing 
  pigment 
  spot 
  distally. 
  

  

  Eurypanopeus 
  depressus. 
  

   c. 
  2 
  Antennule 
  without 
  pigment. 
  

  

  d. 
  1 
  Third 
  maxilliped 
  distally 
  bifurcated 
  Xantho. 
  

  

  d. 
  2 
  Third 
  maxilliped 
  not 
  distally 
  bifurcated. 
  

  

  Panopeus 
  herbstii. 
  

   a. 
  2 
  Exopodite 
  of 
  antenna 
  a 
  distinct 
  segment. 
  

  

  b. 
  1 
  Antenna 
  longer 
  than 
  rostral 
  spine 
  Pilumnus. 
  

  

  b. 
  2 
  Antenna 
  shorter 
  than 
  rostral 
  spine. 
  

  

  c. 
  1 
  Tip 
  of 
  rostral 
  spine 
  hairy 
  Trapezia. 
  

  

  c 
  2 
  Tip 
  of 
  rostral 
  spine 
  smooth. 
  

  

  d. 
  1 
  Antenna 
  one-half 
  as 
  long 
  as 
  rostral 
  spine 
  

  

  Menippe 
  mercenaria. 
  

   d? 
  Antenna 
  two-thirds 
  as 
  long 
  as 
  rostral 
  spine. 
  

  

  Eriphia 
  spinifrons. 
  

  

  PIGMENTATION 
  

  

  Although 
  the 
  pigmentation 
  of 
  the 
  zoeas 
  of 
  each 
  species 
  is 
  a 
  con- 
  

   stant 
  feature 
  and 
  is 
  often 
  of 
  diagnostic 
  value, 
  the 
  older 
  papers 
  do 
  

   not 
  describe 
  it 
  except 
  in 
  the 
  most 
  general 
  terms. 
  The 
  following 
  

   table 
  is 
  based 
  upon 
  the 
  material 
  collected 
  at 
  Beaufort. 
  The 
  pig- 
  

   ment 
  color 
  varies 
  from 
  black 
  to 
  brown. 
  

  

  Table 
  shotting 
  position 
  of 
  chromatophores 
  of 
  zoeas 
  

  

  Neopa- 
  

   nope 
  

  

  Eurypa- 
  

   nopeus 
  

  

  Panopeus 
  

  

  Hexapa- 
  

   nopeus 
  

  

  Menippe 
  

  

  Anterior 
  rostral 
  

  

  Interorbit.nl.. 
  -- 
  

  

  Supracardiae 
  

  

  Dorsal 
  carapace 
  spine 
  

  

  Lateral 
  to 
  first 
  abdominal 
  segment 
  

  

  Postero-ventral 
  lobe. 
  

  

  La 
  brum 
  - 
  

  

  Mandible. 
  

  

  Antennule 
  - 
  

  

  Sternal 
  

  

  Base 
  of 
  antenna 
  

  

  Basipodite 
  first 
  maxilliped 
  

  

  Basipodite 
  second 
  maxilliped 
  

  

  Dorso-lateral 
  first 
  abdominal 
  segment 
  

  

  Ventral 
  firs 
  labdominal 
  segment 
  

  

  Ventro-lateral 
  second 
  abdominal 
  segment. 
  

   Ventrolateral 
  third 
  abdominal 
  segment... 
  

   Ventro-lateral 
  fourth 
  abdominal 
  segment. 
  

   Ventro-lateral 
  fifth 
  abdominal 
  segment... 
  

   Telson 
  - 
  

  

  + 
  

  

  ++ 
  

  

  ++ 
  

  

  ++ 
  

  

  + 
  

  

  ++ 
  

   ++ 
  

  

  + 
  

  

  ++ 
  

   + 
  

  

  METAMORPHOSIS 
  

  

  The 
  complete 
  larval 
  history 
  of 
  Neopanope 
  has 
  been 
  described 
  

   while 
  a 
  nearly 
  complete 
  description 
  has 
  been 
  given 
  for 
  Xantho, 
  

   Pilumnus, 
  and 
  Eriphia. 
  Only 
  the 
  prezoeal 
  and 
  first 
  zoeal 
  forms 
  

   are 
  known 
  for 
  the 
  other 
  genera. 
  

  

  