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  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  [68] 
  

  

  EXPLANATION 
  OF 
  PLATE 
  VI. 
  

  

  FlG. 
  27. 
  Young 
  Apeltes 
  one 
  week 
  old, 
  with 
  the 
  lower 
  lobe 
  of 
  the 
  caudal 
  developing 
  

   and 
  becoming 
  heterocercal. 
  

  

  Fig. 
  28. 
  Recently 
  hatched 
  embryo 
  of 
  Esox 
  reticulatus, 
  showing 
  the 
  wide 
  median 
  fin- 
  

   folds, 
  the 
  distribution 
  of 
  vitelline 
  vessels, 
  and 
  the 
  course 
  of 
  the 
  caudal 
  and 
  subin- 
  

   testinal 
  veins. 
  

  

  Fig. 
  29. 
  A 
  much 
  older 
  stage 
  of 
  Esox 
  reticulatus, 
  in 
  which 
  the 
  flat 
  snout 
  is 
  becoming 
  ap- 
  

   parent 
  and 
  the 
  rudiments 
  of 
  the 
  caudal, 
  anal, 
  and 
  dorsal 
  fins 
  are 
  becoming 
  evi- 
  

   dent. 
  

  

  