On Two New Tapeworms from the Ostrich, with a Key to the Species ofDavainea

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Abstract
The material which forms the basis of the following account consists of two tubes of tapeworms collected from ostriches at the Veterinary Pathological Laboratory, Nairobi, British East Africa. One tube contained approximately 12 scolices and the anterior portions of the strobilae attached to them, together with several fragments of the more posterior portions: these are described under the nameDavainea beddardin. sp. The other tube contained one large fragment of aDavaineaand several smaller pieces but no scolices: these are described under the headingDavaineasp. For this material I am indebted to Professor G. H. F. Nuttall, F.R.S. to whom I wish here to express my thanks. I have also to acknowledge my indebtedness to the Librarian of the Royal College of Veterinary Surgeons for allowing me to consult literature unobtainable elsewhere.