22 
Fig. 10. — Dors^al view of anterior end of the Old 
World hookworm {Agchylostonm duodenale) of 
man. Greatly enlarged. (After Perroncito, 
1882, p. 339, fig. 140. i 
Figs. 11-12. — Old World 
male and female 
hookworms {Agchy- 
lo^toma duodenale) of 
man. Natural size. 
(After Stiles, 1902b, 
p. 187. tigs. 11 . 1 . 116.) 
Fig. 14. — Semidiagrammatic tigure of the caudal 
bursa of an Old World male hookworm {Agchylo- 
sto'ina duodenale) of man. (After Railliet, 1886. p. 
3-57, tig. 247.) 
Fig. 13. — Old World fe- 
male hookworm {Ag- 
chylostoma duodenale) 
of man, greatly en- 
larged diagram to 
show the anatomy: 
a., anus; h. c., buc- 
cal capsule; cul., cul 
de sac of ovary; e., 
esophagus; int., intes- 
tine; u.a. anterior ut- 
erus; u. p., posterior 
uterus; v., vulva and 
vagina. (After Schul- 
thess [copied from 
Blanchard, 1888a, p. 
761. tig. 374].) 
Habitat. — In small intestine of man {Homo sapiens) ; also alleged to occur ii 
certain apes. Africa, Europe, Asia, Philippines, introduced into America. 
