During the past nine years the writer has collected many helminths from the gastro-intestinal tract of various antelopes in Northern Rhodesia.

Amongst the collected material are oesophagostomes from the Puku (Adenota vardoni), the Red Lechwe (Onotragus leche), the Duiker (Cephalophus natalensis), the Kudu (Strepsiceros strepsiceros) and the Roan Antelope (Hippotragus equinus).

Since the publication of the writer's (1932) paper on the nematode genus Anguillulina, opportunities have occurred from time to time for making further observations on the morphology and anatomy of some of the species of the genus found associated with the roots of plants. Certain of them are parasitic in roots, at least during part of their life, at other times occurring free in the soil. Others have not been found within roots but have been obtained only in water extracts of turf and their exact relation to the roots of plants is at present undetermined.

Evidence is put forward to show that eggs of helminth parasites are being constantly re-introduced to land and transferred from one pasture to another. In this way land which has not previously carried poultry for years may yet carry viable eggs which can, and do infect chickens when they are introduced to such runs. The starling and rook are probably important transmitting agents as these congregate among poultry at feeding times. Rabbits and other small rodents may also be carriers but no evidence for this has been looked for yet. Young poultry stock may also become infected with helminths which are normally parasites of wild birds but such parasites, except one Acanthocephalan, have not yet been recovered from or transmitted to older birds experimentally.

Infections with Coenurus glomeratus, which has been reported from West Africa, have been accomplished successfully in the mouse, in the rabbit and gerbille.

Such coenuri produced infections of adult cestodes in the dog but not in the cat.

The coenurus is described from each intermediate host.

The examination of Strongylus edentatus and S. vulgaris revealed that these parasites ingest the hosts' blood and that haematin is the result of the digestion of haemoglobin. The amounts of blood necessary to form the quantities recorded as being present in the parasites' intestines have been calculated.