PLATE I. 
Figs. 1-4. Ascaris simplex, 
Fig. 1. Animal; natural size. 
Fig. 2. Upper lip, from dorsal aspect. 
Fig. 3. Lips, viewed from the anterior aspect, a, Upper lip ; 
c, lower lip. 
Fig. 4. Ovum. 
Figs. 5-7. Ascaris spiculigera, 
Fig. 5. Animal ; natural size. 
Fig. 6. Head end, with upper lip and accessory lips (a). 
Fig. 7. Tail end of male. 
Figs. 8, 9. Ascaris biloba, 
Fig. 8. Animal ; natural size. 
Fig. 9. Head end, from dorsal surface. 
Figs. 10, 11. Ascaris macruri, 
Fig. 10. Animal ; natural size. 
Fig. 11. Head end, from dorsal surface. 
Figs. 12, 13. Ascaris diomedese , 
Fig. 12. Animal ; natural size. 
Fig. 13. Head end, from dorsal surface, a, Neck papillae. 
Figs. 14-16. Filaria cirrohamata, 
Fig. 14. Animal; natural size. 
Fig. 15. Head end. a, Neck papillae. 
Fig. 16. Tail end of the male, from the ventral surface. 
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, mouth aperture; 
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7 
6 
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