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A LIST OF NEMATODE PARASITES OBSERVED 
IN THE ALIMENTARY CANAL OF SHEEP IN 
ENGLAND. 
By CHARLES L. BOULENGER, M.A., D.Sc. 
Reader in Helminthology, the University of Birmingharn. 
{From the Research Laboratory in Agricultural Zoology, University 
of Birmingham.) 
(With Plate XIX and 4 Text-figures.) 
Whilst engaged in the study of the life-histories of certain 
Nematode parasites of domestic animals, I have had the opportunity 
of examining the alimentary tracts of a number of sheep and lambs 
obtained from various localities in England during the last 12 months, 
and have thus been able to collect and identify a considerable number 
of the parasitic Nematodes which are found so abundantly in this 
situation. 
Owing chiefly to the researches of Ransom in the United States, 
Railliet and Henry in France and Looss in Egypt, our knowledge of 
the round-worm parasites of sheep and other ruminants has increased 
considerably during recent years ; little work has, however, been done 
on this subject in England, the larger and more conspicuous forms have 
received some attention, yet very few records exist of the smaller 
species or of those which require careful microscopical examination for 
their identification. 
The object of the present paper is to furnish a complete list of the 
parasitic Nematodes observed in the digestive tract of sheep during 
the past year. Thanks to Ransom’s very complete monograph (1911) 
the identification of these parasites no longer presents great difficul¬ 
ties ; about 28 species of Nematodes, belonging to 13 genera, have been 
recorded from different parts of the world, of these I have met vdth 
