ILLUSTRATION 
PLATE 1 
Figs. 1 to 10. Eggs of Ascaris vitolorum in different stages of develop- 
ment, showing variations in shape and size. 
11 and 12. Embryonated eggs of Ascaris vitolorum. 
Fic. 13. Undeveloped egg of Ascaris vitolorum from feces of rat twenty- 
four hours after artificial infection. 
14. Empty eggshell of Ascaris vitolorum from feces of rat twenty- 
four hours after artificial infection. 
669 
