﻿abt. 
  3 
  STUDIES 
  ON 
  LARVAE 
  OF 
  CRABS 
  HYMAN 
  17 
  

  

  appendages 
  become 
  the 
  organs 
  of 
  locomotion, 
  each 
  appendage 
  being 
  

   equipped 
  with 
  numerous 
  long 
  swimming 
  hairs. 
  

  

  Cephalic 
  appendages. 
  — 
  These 
  are 
  typical 
  for 
  the 
  megalops. 
  

  

  Thoracic 
  appendages. 
  — 
  The 
  first 
  maxilliped 
  is 
  relatively 
  smaller 
  

   and 
  its 
  endopodite 
  and 
  exopodite 
  are 
  degenerated 
  (fig. 
  186). 
  It 
  car- 
  

   ries 
  a 
  large 
  epipodite. 
  The 
  second 
  maxilliped 
  (fig. 
  188) 
  is 
  small. 
  Its 
  

   exopodite 
  is 
  degenerated 
  and 
  its 
  exopodite 
  has 
  become 
  a 
  palp 
  of 
  five 
  

   segments. 
  It 
  carries 
  a 
  small 
  epipodite 
  and 
  a 
  small 
  gill 
  bud. 
  The 
  

   third 
  maxilliped 
  (fig. 
  189) 
  is 
  quite 
  large. 
  Its 
  endopodite 
  is 
  com- 
  

   posed 
  of 
  six 
  segments. 
  It 
  carries 
  an 
  epipodite 
  and 
  two 
  gills. 
  The 
  

   cheliped 
  (fig. 
  191) 
  shows 
  the 
  typical 
  spine 
  on 
  its 
  third 
  segment 
  and 
  

   has 
  two 
  gills 
  on 
  the 
  coxopodite. 
  

  

  SECOND 
  MHGAL0PS 
  (fig. 
  182) 
  

  

  The 
  carapace 
  is 
  further 
  broadened 
  and 
  depressed. 
  The 
  frontal 
  

   margin 
  is 
  broadened 
  and 
  somewhat 
  bulbous. 
  The 
  abdomen 
  is 
  per- 
  

   manently 
  flexed 
  under 
  the 
  sternum. 
  

  

  The 
  first 
  maxilliped 
  (fig. 
  187) 
  is 
  somewhat 
  enlarged 
  and 
  has 
  ac- 
  

   quired 
  its 
  adult 
  form. 
  The 
  third 
  maxilliped 
  (fig. 
  190) 
  has 
  reached 
  

   its 
  adult 
  form. 
  Both 
  exopodite 
  and 
  endopodite 
  terminate 
  in 
  palps. 
  

   The 
  proximal 
  segments 
  of 
  the 
  endopodite 
  form 
  an 
  operculum 
  for 
  the 
  

   other 
  mouth 
  parts. 
  

  

  BIBLIOGRAPHY 
  

  

  1879. 
  Bate, 
  C. 
  Spence. 
  Report 
  on 
  the 
  present 
  state 
  of 
  our 
  knowledge 
  of 
  the 
  

  

  Crustacea. 
  Part 
  4. 
  On 
  development. 
  Report 
  Brit. 
  Assoc. 
  Adv. 
  Sci., 
  

   48th 
  Meeting. 
  1878, 
  pp. 
  193-209, 
  pis. 
  5-7. 
  

  

  1882. 
  Birge, 
  E. 
  A. 
  Notes 
  on 
  the 
  development 
  of 
  Panopseus 
  sayi 
  (Smith). 
  

  

  Johns 
  Hopkins 
  University 
  Studies, 
  Biol. 
  Lab., 
  vol. 
  2, 
  no. 
  4, 
  pp. 
  411-426, 
  

  

  pis. 
  30-33. 
  

   1891. 
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  G. 
  Sviluppo 
  postembrionale 
  dei 
  Caneridi. 
  Bull. 
  Soc. 
  Entomol. 
  

  

  Ital., 
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  vol. 
  23, 
  pp. 
  146-158, 
  pis. 
  3, 
  4. 
  

   1843. 
  Couch, 
  R. 
  Q. 
  On 
  the 
  metamorphosis 
  of 
  the 
  Decapod 
  Crustaceans. 
  11th 
  

  

  Ann. 
  Rept. 
  Roy. 
  Cornwall 
  Polytechnic 
  Soc, 
  pp. 
  28-43, 
  pi. 
  1. 
  

  

  1880. 
  Faxon, 
  W. 
  On 
  some 
  points 
  in 
  the 
  structure 
  of 
  the 
  embryonic 
  zoea. 
  

  

  Bull. 
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  6, 
  no. 
  10, 
  pp. 
  1-8, 
  pis. 
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  1883. 
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  P. 
  Considerations 
  sur 
  la 
  faune 
  pelaglque 
  du 
  Golfe 
  de 
  Mar- 
  

  

  seille. 
  Ann. 
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  Hist. 
  Nat. 
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  Zool., 
  vol. 
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  mem. 
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  1, 
  

  

  pp. 
  14-24, 
  pis. 
  1, 
  2, 
  Marseille, 
  1882. 
  

   1920. 
  Hyman, 
  O. 
  W. 
  On 
  the 
  development 
  of 
  Gelasimus 
  after 
  hatching. 
  Journ. 
  

  

  Morphology, 
  vol. 
  23, 
  no. 
  2, 
  pp. 
  485-524, 
  pis. 
  1-12. 
  

   1922. 
  Adventures 
  in 
  the 
  life 
  of 
  a 
  Fiddler 
  Crab. 
  Smithsonian 
  Rept. 
  for 
  

  

  1920 
  (1922), 
  pp. 
  443^00, 
  pis. 
  1-6. 
  

  

  