﻿558 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  [70] 
  

  

  EXPLANATION 
  OF 
  PLATE 
  VII. 
  

   (Species 
  No. 
  1.) 
  

  

  Fig. 
  30. 
  Showing 
  developing 
  egg 
  removed 
  from 
  its 
  membrane. 
  The 
  spreading 
  blas- 
  

   toderm 
  has 
  greatly 
  constricted 
  the 
  yelk. 
  

  

  Fig. 
  31. 
  A 
  somewhat 
  earlier 
  stage 
  of 
  the 
  same 
  in 
  its 
  membrane, 
  over 
  a 
  part 
  of 
  which 
  

   the 
  adhesive 
  covering 
  of 
  the 
  latter 
  has 
  collected 
  and 
  formed 
  a 
  disk 
  -like 
  mass, 
  by 
  

   which 
  it 
  adhered 
  to 
  a 
  piece 
  of 
  leather. 
  

  

  Fig. 
  32. 
  A 
  more 
  advanced 
  stage 
  of 
  the 
  same. 
  

  

  Fig. 
  33. 
  A 
  still 
  more 
  advanced 
  stage, 
  in 
  which 
  the 
  distribution 
  of 
  the 
  oil-drops 
  is 
  evi- 
  

   dent 
  and 
  Kupffer's 
  vesicle 
  is 
  developed 
  under 
  the 
  posterior 
  end 
  of 
  the 
  embryo. 
  

  

  Fig. 
  34. 
  A 
  larva 
  which 
  was 
  developed 
  from 
  this 
  same 
  lot 
  of 
  eggs, 
  three 
  days 
  after 
  

   hatching, 
  showing 
  the 
  distribution 
  of 
  the 
  pigment 
  on 
  the 
  body, 
  tail, 
  and 
  at 
  the 
  

   junctions 
  of 
  the 
  vessels 
  of 
  the 
  yelk-sack. 
  

  

  