. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. 256 HOOKWORMS World species the mouth (Fig. lOlA) is armed with a number of chitinous hooklike teeth, which in the American species are replaced by hard ridges or hps (Fig. lOlB). The male worms are. Am. Hookworm noh size Qld World hookworm Fig. 100. American hookworm, Necator americanus, male (6 ) and female (?); , buccal ca"ty; ph., pharynx; int., intestine; cerv. gl., cervical gland; t., testis; sp. d., sperm duct; b., bursa; ov., ovaries and oviducts; v., vulva or genital opening;

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. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. 256 HOOKWORMS World species the mouth (Fig. lOlA) is armed with a number of chitinous hooklike teeth, which in the American species are replaced by hard ridges or hps (Fig. lOlB). The male worms are. Am. Hookworm noh size Qld World hookworm Fig. 100. American hookworm, Necator americanus, male (6 ) and female (?); , buccal ca"ty; ph., pharynx; int., intestine; cerv. gl., cervical gland; t., testis; sp. d., sperm duct; b., bursa; ov., ovaries and oviducts; v., vulva or genital opening; a, anus. X 8. (Partly after Manson.) also cylindrical but instead of tapering at the tail end they possess an umbrella-like expansion known as a bursa, which is sup-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Chandler, Asa Crawford, 1891-. New York, J. Wiley

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