﻿Report 
  U. 
  S. 
  F. 
  C. 
  1897. 
  l,To 
  face 
  page 
  136.) 
  

  

  Plate 
  37. 
  

  

  A. 
  Freshly 
  extriuled 
  egg 
  enlarged, 
  showing 
  its 
  envelope 
  much 
  wrinkled 
  and 
  its 
  surface 
  covered 
  with 
  

   small 
  round 
  ve.sifles. 
  

  

  B. 
  Shad 
  egg, 
  showing 
  vitellus 
  and 
  distended 
  egg-niemljrane, 
  natural 
  size. 
  

  

  C 
  Shows 
  the 
  gradual 
  accninulatiou 
  cif 
  germinal 
  matter 
  at 
  one 
  jmle 
  of 
  ^'i:.'^, 
  the 
  jiolar 
  prominence 
  ex- 
  

   ternally, 
  and 
  iireseuceof 
  )ilasniic 
  jiroeesses 
  extending 
  down 
  through 
  Ilie 
  vitellus. 
  

  

  Ih 
  Eiubryo 
  shad 
  in 
  its 
  natural 
  i>osition 
  in 
  its 
  spacious 
  enveloping 
  iiieiidirane. 
  From 
  a 
  photograph. 
  

  

  E. 
  Diagrammatic 
  reiire.sentation 
  of 
  anendiryo 
  to 
  show 
  course 
  of 
  segmental 
  ducts 
  srf 
  and 
  extension 
  

   outward 
  of 
  pectoral 
  plates 
  ;);). 
  which 
  are 
  intiniatelv 
  concerned 
  in 
  the 
  development 
  of 
  pectoral 
  fins. 
  

  

  /-.Side 
  view 
  of 
  a 
  young 
  .shad 
  13 
  days 
  old, 
  viewed 
  as 
  a 
  transiiarent 
  ohiect. 
  06, 
  rudimentarv 
  air- 
  

   hladder; 
  L, 
  liver: 
  Gh, 
  gall-bladder. 
  

  

  G. 
  An 
  embryo 
  in 
  its 
  envelope, 
  on 
  the 
  third 
  day 
  of 
  development, 
  nearly 
  ready 
  to 
  hatch. 
  

  

  