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adult anal swab anthelmintic anus Ascaris Ascaris lumbricoides birds bobwhite quail boys Bozicevich Bureau bursa Capillaria cause ceca cent Cheilospirura chickens chicks coccidia coccidiosis colini color contorta Cram cresol crop culture developed disinfectants dorsal dose ducks embryos enemas esophagus external leaf crown feathers feeding female flock fowls geese genital cone gizzard hamulosa hatched head end hexylresorcinol illus incidence inflammation intermediate hosts intestine large numbers larvae later lice male method mites mouth capsule mucosa negative Negroes nematodes number of eggs occur organs ovary papillae parasite percent positive persons pigeons pinworm pinworm infestation positive for pinworms posterior end poultry present pullorum disease Railliet roundworm ruffed grouse showed skin solution species specimens spicule spicule sheath spines spiralis stage Studies on oxyuriasis surface swab examinations symptoms tail end tapeworms tion tissues total number Travassos treatment turkeys uteri ventral vulva wall Washington worms young