LIST OF TTJJTS^r-RA;rTOFiS. 
Page. 
Fig. 1. Caudal Imrsa of a male strongyle ( rE'.s'o;>//a 7 o.s-/omo (hutatnm) to nerve 
as diagram for the family 13 
2-9. New World hookworm ( Uncinaria americaita ) . 
2. New World male hookworm 18 
8. New World female hookworm 18 
4. The same enlarged to show the position of the anus and vulva 18 
5. Dorsal view of anterior end of New World hookworm 18 
6. Lateral view of anterior end of New World hookworm 18 
7. Lateral view of caudal bursa of New World male hookworm 18 
8. Caudal end of New World male hookworm 19 
9. Four eggs of New World hookworm 20 
10—41. Old World hookworm {Agchylofttoma duodenale). 
10. Dorsal view of anterior end of Old World hookworm 22 
11. Old World male hookworm 22 
12. Old World female hookworm 22, 
18. The same (diagrammatic) enlarged to show the position of the anus 
and vulva 22 
14. Semidiagrammatic figure of caudal bursa of same 22 /■ 
15. Lateral view of Old World male hookworm enlarged to show the 
anatomy 28 
16. Fggs of Old World hookworm 24 
17-29. Embryology of Old World hookworm 24 
80-81. Larva) at the end of the, second stage (encysted larva') 25 
82. A young hookworm of man, without buccal capsule, four <lays after 
infection 26 
88. Anterior end of larval hookworm during formation of provisional 
buccal capsule 26 
84. Head of larval hookworm before entering the fourth stage, five davs 
after infection 26 
85. Young hookworm in fourth stage, with provisional buccal capsule — 27 
86. Provisional buccal capsule (fourth stage) of larval hookworm, about 
nine days after infection -7 
37. Young male hookworm, about nine days after infection 27 
38-89. Develoiiment of definite buccal capsule -8 
40-41. Male and female hookworms before the fourth casting of skin, fourttn'ii 
to fifteen days after infection 
42. A severe case of hookworm disease observed in Florida 46 
48-85. Eggs and embryos of other parasitic worms. 
43. Egg of common eel worm or ascaris {Aacurix lutuhricoiden) of man 82 
44. The same, optical section, seen with median focus 82 
45-54. Embryology of common ascaris of man after the egg is discharge<l in 
the feces 
55. Embryo of the common ascaris of man, in its eggshell 82 
i 
