﻿618 
  

  

  EEPOET 
  OF 
  COMMISSIONER 
  OP 
  ElSft 
  AND 
  FISlTEElES. 
  

  

  [14] 
  

  

  individuals; 
  and 
  the 
  number 
  of 
  eggs 
  is 
  the 
  estimate 
  for 
  a 
  single 
  indi- 
  

   vidual 
  of 
  medium 
  or 
  large 
  size, 
  or 
  the 
  extremes 
  of 
  variation 
  in 
  two 
  or 
  

   more 
  individuals. 
  The 
  measurements 
  given 
  have 
  all 
  been 
  made 
  from 
  

   alcoholic 
  specimens, 
  and 
  in 
  some 
  cases, 
  where 
  the 
  eggs 
  were 
  not 
  very 
  

   well 
  preserved, 
  may 
  not 
  agree 
  perfectly 
  with 
  measurements 
  of 
  fresh 
  

   eggs, 
  though 
  all 
  the 
  measurements 
  are 
  probably 
  vithin 
  the 
  range 
  of 
  

   variation 
  for 
  the 
  species. 
  Measurements 
  of 
  fresh 
  eggs 
  of 
  Romarus 
  

   Americmius 
  and 
  Palcemonetes 
  vulgaris, 
  and 
  of 
  the 
  same 
  eggs 
  after 
  pres- 
  

   ervation 
  in 
  alcohol, 
  show 
  no 
  marked 
  shrinkage 
  in 
  the 
  diameter 
  of 
  the 
  

   chorion, 
  and 
  this 
  probably 
  holds 
  good 
  for 
  other 
  Decapod 
  eggs 
  when 
  well 
  

   preserved. 
  In 
  many 
  cases 
  the 
  form 
  of 
  the 
  egg, 
  and 
  possibly 
  the 
  size 
  

   also, 
  changes 
  slightly 
  during 
  the 
  development 
  of 
  the 
  embryo, 
  there 
  

   being 
  a 
  tendency 
  for 
  the 
  egg 
  to 
  elongate 
  as 
  development 
  proceeds. 
  For 
  

   this 
  reason, 
  as 
  well 
  as 
  for 
  greater 
  ease 
  of 
  comparison, 
  the 
  average 
  of 
  

   the 
  longer 
  and 
  shorter 
  diameters 
  is 
  given. 
  

  

  Diameter 
  and 
  number 
  of 
  Decapod 
  eggs. 
  

  

  Speeies 
  and 
  bathymetrical 
  habitat. 
  

  

  BRACHYURA. 
  

  

  Maioidea. 
  

  

  Hyas 
  araneus 
  

  

  Hyas 
  coarctatus 
  

  

  Lispognathua 
  Thomsoni 
  

  

  Collodes 
  depressus 
  

  

  < 
  Jollodes 
  robnstus 
  

  

  Eupiognatha 
  rastellifera 
  

  

  jSletoporhapis 
  calcaratna 
  

  

  Leptopodia 
  sagittaria 
  

  

  Podochela 
  Riisei 
  

  

  Canceoidea. 
  

  

  Callinectes 
  ha 
  status 
  

  

  Neptnnus 
  Sayi 
  

  

  A 
  ehelous 
  anceps 
  . 
  .' 
  

  

  ( 
  leivoii 
  quinqnedena 
  

  

  OCYPODOIBEA. 
  

  

  TTantilograpsus 
  minutns 
  

  

  Pinnixa 
  cbactopterana.... 
  

  

  ANOMURA. 
  

  

  Latukii.uoidea. 
  

  

  Lafreillia 
  elogans 
  

  

  nOMOLOIDEA. 
  

  

  Homola 
  barbata 
  

  

  LlTHODOIHEA 
  

  

  Li 
  th 
  odes 
  Agassizii 
  

  

  PAOUUOniEA, 
  

  

  Eupagurus 
  I 
  lernhardus 
  

  

  Eupagurus 
  politus 
  

  

  Eupagurus 
  pubescens 
  ... 
  

  

  Eupagurus 
  Kroyei'i 
  

  

  • 
  latapagurua 
  Sharrcri 
  

  

  i 
  latapagurus 
  gracilis 
  

  

  Parapagurna 
  pilosimanus 
  

  

  Fathoms. 
  

  

  200 
  

   300 
  

  

  400 
  

   200 
  

  

  -100 
  

   -100 
  to 
  

   200 
  to 
  

   -100 
  

   -100 
  to 
  

   -100 
  to 
  

   -100 
  

   -100 
  

   -100 
  

  

  —100 
  

   -100 
  

   —100 
  

   —100 
  to 
  1,100 
  

  

  —100 
  

   —100 
  

  

  Diameter. 
  

  

  Millim. 
  

   0.67 
  

   0.60 
  

   0.7 
  

   0.48 
  

   0.80 
  

   0. 
  05 
  

   0.57 
  

   0.50 
  

   0.57 
  

  

  0.28 
  

   0.33 
  

   0.26 
  

   0.74 
  

  

  0. 
  35 
  

   0.26 
  

  

  Number. 
  

  

  4, 
  500, 
  000 
  

   47, 
  000 
  

  

  2,000 
  

  

  