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By John M. Watson and J. B. Stenlake (Auth.)

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Hexamita meleagridis. Giardia lamblia—trophozoite in side view. —trophozoite from above. —cyst. Chilomastix mesnili—trophozoite. 13 14 15 16 17 18 19 20 Trichomonas hominis. Trichomonas vaginalis. Trichomonas foetalis. Trichomonas gallinarum. Typical trypanosome. Trypanosoma gambiense in blood of host. Leishmania donovani—aflagellate forms in an endothelial cell. Leishmania tropica—flagellate forms from culture. 12 —cyst. AN INTRODUCTION TO PARASITOLOGY severe in turkeys. Transmission is by direct contamination of food, as with other intestinal parasites, but can also occur by introduction of the parasite with the eggs of the nematode worm Heterakis gallinae.

Aquatic snails 2. Frogs and other species of snails 1. Aquatic snails 2. Frogs and tadpoles 1. Aquatic snails 2. Freshwater fish 1. Water-snails 2. Tadpoles Various species of aquatic snails Unknown Intermediate hosts TABLE 3 Enteritis Fatal enteritis in mink Enteritis Haemorrhagic enteritis in mink Enteritis Enteritis, diarrhoea, weakness Enteritis, emaciation, anaemia and weakness Enteritis, emaciation, anaemia, weakness Enteritis Pathogenic effects North Sea area Europe, Asia Comment Cats, pigs, dogs Dogs, foxes and fur-bearers Small intestine Enteritis Enteritis, debility, diarrhoea Land snails Unknown South Europe, North Africa, Indo-China North Africa China India Most serious trematode parasite of poultry in Europe and America 1 As for P.

Elongate sarcocysts (Miescher's tubes), ranging from a few microns up to several centimetres in length, are found among the muscle fibres, each divided by septa into chambers containing rounded cells that give rise to bean-shaped spores (Rainey's corpuscles), rounded at one end and pointed at the other. When the cyst is ingested by a suitable host the spores are liberated, penetrate epithelial cells of the intestinal wall, and multiply by binary fission. The daughters enter the lymph and blood corpuscles of the villi and are carried to the muscles, where they develop into new sarcocysts.

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