﻿just. 
  3 
  STUDIES 
  ON 
  LARVAE 
  OF 
  CRABS 
  HYMAN 
  13 
  

  

  form 
  a 
  sensory 
  palp. 
  The 
  basipodite 
  carries 
  an 
  epipodite 
  and 
  two 
  

   gills. 
  

  

  The 
  pereiopods 
  assume 
  practically 
  the 
  adult 
  condition 
  (fig. 
  149). 
  

   The 
  cheliped 
  shows 
  the 
  characteristic 
  spine 
  on 
  the 
  third 
  segment. 
  

  

  Abdomen. 
  — 
  The 
  abdomen 
  is 
  broadened 
  and 
  depressed. 
  Each 
  seg- 
  

   ment, 
  beginning 
  with 
  the 
  second, 
  bears 
  a 
  well-developed 
  appendage. 
  

   Each 
  typically 
  consists 
  of 
  a 
  proximal 
  segment 
  bearing 
  a 
  flattened 
  

   exopodite 
  and 
  a 
  minute 
  endopodite. 
  The 
  exopodite 
  carries 
  long, 
  

   plumose 
  swimming 
  hairs 
  along 
  its 
  border. 
  The 
  hairs 
  of 
  the 
  en- 
  

   dopodite 
  are 
  small 
  and 
  curled 
  inward 
  as 
  hooks. 
  The 
  appendages 
  of 
  

   the 
  hist 
  segment 
  do 
  not 
  have 
  endopodites. 
  

  

  SECOND 
  MEGALOPS 
  (fig. 
  130) 
  

  

  The 
  second 
  megalops 
  stage 
  differs 
  only 
  slightly 
  from 
  the 
  first. 
  The 
  

   front 
  of 
  the 
  carapace 
  is 
  altered 
  and 
  the 
  whole 
  carapace 
  somewhat 
  

   broadened 
  in 
  outline. 
  

  

  FIRST 
  CKAB 
  (fig. 
  131) 
  

  

  The 
  carapace 
  is 
  further 
  depressed 
  and 
  its 
  front 
  is 
  gently 
  rounded. 
  

   The 
  outline 
  of 
  the 
  carapace 
  dorsally 
  is 
  almost 
  circular. 
  The 
  appen- 
  

   dages 
  have 
  undergone 
  minor 
  changes 
  only. 
  

  

  ERIPHIA 
  SPINIFRONS 
  (Herbst) 
  

   Plate 
  12, 
  figs. 
  152-161 
  

  

  Cano 
  has 
  described 
  the 
  development 
  of 
  Eriphia 
  and 
  compared 
  it 
  

   with 
  Xantho. 
  The 
  two 
  show 
  close 
  agreement 
  in 
  many 
  particulars, 
  

   but 
  Eriphia 
  belongs 
  with 
  Menippe, 
  Trapezia, 
  and 
  Pilumnus 
  in 
  hav- 
  

   ing 
  smaller 
  antennae 
  with 
  well-developed 
  exopodites. 
  

  

  FIRST 
  ZOEA 
  (fig.. 
  152) 
  

  

  The 
  first 
  zoea 
  is 
  sharply 
  distinguished 
  from 
  those 
  of 
  Panopeus 
  

   and 
  Xantho 
  by 
  the 
  relatively 
  inconspicuous 
  antenna. 
  The 
  dorsal 
  

   spine 
  is 
  long 
  and 
  robust, 
  as 
  is 
  also 
  the 
  rostral, 
  although 
  neither 
  is 
  as 
  

   long 
  as 
  in 
  the 
  above-mentioned 
  forms. 
  The 
  lateral 
  spines 
  are 
  

   slender. 
  

  

  Cephalic 
  appendages. 
  — 
  The 
  antennule 
  (fig. 
  155) 
  is 
  typical. 
  

   The 
  antenna 
  (fig. 
  155) 
  has 
  a 
  short 
  spine 
  that 
  is 
  hairy 
  along 
  its 
  

   distal 
  three-fourths. 
  The 
  spine 
  is 
  approximately 
  half 
  as 
  long 
  as 
  

   the 
  frontal 
  spine 
  of 
  the 
  carapace. 
  The 
  exopodite 
  is 
  composed 
  of 
  a 
  

   single 
  fingerlike 
  segment 
  that 
  bears 
  two 
  or 
  three 
  hairs 
  distally. 
  It 
  

   is 
  two-thirds 
  as 
  long 
  as 
  the 
  spine. 
  The 
  other 
  cephalic 
  appendages 
  

   are 
  typical. 
  

  

  Thoracic 
  appendages. 
  — 
  These 
  all 
  have 
  the 
  typical 
  brachvuran 
  

   form. 
  

  

  Abdomen. 
  — 
  The 
  telson 
  (fig. 
  159) 
  has 
  three 
  median 
  spines 
  and 
  two 
  

   minute 
  lateral 
  spines 
  on 
  each 
  cornu. 
  

  

  