﻿600 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  [112] 
  

  

  EXPLANATION 
  OF 
  PLATE 
  XXVIII. 
  

   Ictalurus 
  axjjidus. 
  {White 
  Cat-fi8h.) 
  

  

  Fig. 
  169. 
  Young 
  cat-fish, 
  twelve 
  days 
  old, 
  viewed 
  as 
  an 
  opaque 
  object, 
  x 
  10. 
  

   Fig. 
  170. 
  Young 
  cat-fish, 
  twenty 
  days 
  old, 
  viewed 
  as 
  an 
  opaque 
  object, 
  x 
  10, 
  

  

  