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  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  [62] 
  

  

  EXPLANATION 
  OF 
  PLATE 
  III. 
  

  

  Fig. 
  12. 
  Head 
  of 
  young 
  Siphostoma 
  fuseum. 
  

  

  Fig. 
  13. 
  Developing 
  egg 
  of 
  Elacate 
  Canada, 
  showing 
  the 
  spacious 
  cleavage 
  cavity 
  8 
  8, 
  

  

  Kupffer's 
  vesicle 
  lev, 
  the 
  chorda 
  ch, 
  the 
  segments 
  mm 
  of 
  the 
  embryo, 
  and 
  the 
  limbs 
  

  

  br 
  of 
  the 
  concrescing 
  blastopore, 
  the 
  oil-drop 
  o, 
  and 
  the 
  optic 
  vesicles 
  op. 
  

   Fig. 
  14. 
  An 
  earlier 
  phase 
  of 
  the 
  development 
  of 
  an 
  egg 
  of 
  the 
  same 
  species. 
  

   Fig. 
  15. 
  The 
  unimpregnated 
  ovum 
  of 
  the 
  file-fish, 
  Monacanthus 
  broccus, 
  showing 
  the 
  

  

  position 
  of 
  the 
  oil-drops 
  and 
  the 
  form 
  of 
  the 
  blastodisk. 
  

   Fig. 
  16. 
  The 
  developing 
  ovum 
  of 
  the 
  gold-fish 
  Varassius 
  aurulus, 
  showing 
  the 
  extent 
  

  

  to 
  which 
  the 
  embryo 
  embraces 
  the 
  circumference 
  of 
  the 
  vitellus. 
  x 
  32. 
  

   Figs. 
  17 
  and 
  18. 
  Other 
  views 
  of 
  a 
  similar 
  stage 
  of 
  the 
  same 
  species. 
  

  

  