﻿U. 
  S. 
  NATIONAL 
  MUSEUM 
  

  

  PROCEEDINGS, 
  VOL. 
  XX 
  PL. 
  L 
  

  

  PARASITIC 
  WORMS. 
  

  

  DiSTOMUM 
  FROM 
  SUNFISH 
  (Mola). 
  

   For 
  explanation 
  of 
  plate 
  see 
  page 
  546. 
  

  

  