PLATE V1I1 



PLATE VIII 



Fig. 1. Anterior end of Necator americanus. From Looss. 



Fig. 2. Anterior end of Ancylostoma duodenale. From Looss. 



Fig. 3. Bursa of Necator americanus. From Looss. 



Fig. 4. Bursa of Ancylostoma duodenale. From Looss. 



Fig. 5. Adult male of Enter obius vermicularis (Oxyuris vermicu- 

 laris). From Leuckart. 



Fig. 6. Adult female of Enterobius vermicularis (Oxyuris vermi- 

 cularis). From Leuckart. Letters used: a, anus; es, esophagus; 

 i, intestine; ov, ovary; u, uterus; v, vulva; vg, vagina. 



Fig. 7. Adult male of Trichuris trichiura. From Castellani and 

 Chalmers after Glaus. Letters used: s, spicule; sv, seminal vesicle; 

 t, testis. 



Fig. 8. Adult female of Trichuris trichiura. From Castellani and 

 Chalmers after Glaus. 



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