﻿U. 
  S. 
  NATIONAL 
  MUSEUM 
  

  

  PROCEEDINGS, 
  VOL. 
  XX 
  PL. 
  XLI 
  

  

  

  

  PARASITIC 
  WORMS. 
  

  

  OCTOPLECTANUM 
  FROM 
  FLOUNDER; 
  DiPLOSTOMUM 
  FROM 
  BREAM, 
  ETC. 
  

   For 
  explanation 
  of 
  plate 
  see 
  page 
  543. 
  

  

  