Onchotyle appendiculata from a dog-fish, [464]
Opossum, Echinorhynchus in a Brazilian, [434]
Opossums, flukes infesting American, [432]
" much infested by nematodes, [433]
Orcella brevirostris, fluke found by Dr Anderson in, [417]
Orthagoriscus mola as a “host”, [471]
Ostrich, entozoa from the American, [447]
Otters, flukes and other entozoa of, [298]
Ox, insect parasites and tormentors of the, [351]
" species of Strongylus infesting the, [347]
Oxyuridæ, a family of round worms, [5]
Oxyurides, sanitary precautions in respect of, [232]
" source and mode of development of, [230]
" voluntary swallowing of human, [72]