Abstract
Four species of the genus Capillaria—C. anatis, C. bursata, C. caudinflata and C. obsignata—are described from the domestic fowl. C. bursata constitutes a new species record for Britain. Taxonomic problems concerning these species in particular, and of Capillaria species in general, are discussed in the light of experience gained from the present study.This work was carried out during the tenure of a British Egg Marketing Board research studentship and is part of a thesis accepted by the University of London for the Ph.D. degree. My thanks are due to the director of the Houghton Poultry Research Station for granting facilities for work and to the staff for their help and encouragement. Mr R. A. Avery kindly supplied me with material collected from the Wildfowl Trust, Slimbridge.

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