﻿5f)0 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  [72] 
  

  

  EXPLANATION 
  OF 
  PLATE 
  VIII. 
  

  

  Fig. 
  35. 
  Magnified 
  view 
  of 
  an 
  egg 
  of 
  the 
  common 
  yellow 
  perch, 
  showing 
  the 
  micro 
  - 
  

   pyle 
  m, 
  the 
  thin 
  zona 
  radiata 
  z, 
  the 
  thick, 
  elastic, 
  canaliculated 
  or 
  fibrillated 
  

   layer 
  g, 
  and 
  the 
  outer 
  adhesive 
  layer 
  a. 
  

  

  Figs. 
  36 
  and 
  37. 
  Views 
  of 
  ova 
  of 
  the 
  white 
  perch, 
  in 
  which 
  the 
  large 
  blastodisk 
  is 
  

   formed; 
  also 
  showing 
  the 
  way 
  in 
  which 
  the 
  adhesive 
  covering 
  of 
  the 
  egg 
  forms 
  

   disk-like 
  accumulations 
  where 
  they 
  come 
  in 
  contact 
  with 
  each 
  other 
  or 
  with 
  flat 
  

   surfaces. 
  

  

  Fig. 
  38. 
  A 
  more 
  advanced 
  stage 
  of 
  the 
  development 
  of 
  the 
  same 
  species, 
  showing 
  the 
  

   very 
  thick 
  blastoderm 
  in 
  optic 
  section. 
  

  

  Fig. 
  39. 
  A 
  still 
  more 
  advanced 
  stage 
  of 
  the 
  same 
  species. 
  

  

  