﻿U. 
  S. 
  NATIONAL 
  MUSEUM 
  

  

  PROCEEDINGS, 
  VOL. 
  XX 
  FL. 
  XXIX 
  

  

  

  Parasitic 
  Worms 
  {Dibuthrinm) 
  from 
  Cod 
  and 
  Paddlefish. 
  

  

  For 
  explanation 
  of 
  plate 
  see 
  page 
  454. 
  

  

  