This thesis is concerned with a collection of nematode parasites collected from Egyptian birds which was sent to the Institute of Parasitology, Macdonald College, by United States Navy Medical Unit 3, Cairo, Egypt. Recently, this unit was carrying on research in the distribution of schistosomiasis and other parasitic diseases infectious to man in the Middle Eastern countries of Yemen, Egypt and the Sudan. It was decided that it would be of considerable value to Science to make a study of the ecto- and endoparasites of these areas, and ultimately to publish a host-parasite list of the findings.

The present paper was started as an investigation into the parallel variability of two species of Entodinium related to E. caudatum. It has shown, that all these species produce sets of forms with the "caudatum", "loboso-spinosum" and "dubardi" types of the caudal spination. It became obvious, that in the literature the specific names of E. caudatum, E. loboso-spinosum and E. dubardi were used to designate assemblages of parallel forms belonging to different species of Entodinium.

In 1949 Bird and Whalen (5) noted the presence of a microsporidian in field populations of the spruce budworm Choristoneura fumiferana (Clem.). As studies of the mortality factors affecting the spruce budworm were intensified and attempts were made to work out life tables for this insect, it became increasingly important to know more about this protozoan. Although the Microsporidia have been known since the time of Pasteur and wall over 100 species have been described, little attention has been paid to the affects of these parasites on their hosts. This thesis is an attempt to identify this organism, elucidate its biology, and determine its affect upon the host.

Hydatid disease has been known since the early days of medicine and is widely distributed throughout the world. It is prevalent in South America, Iceland, Australia, New Zealand and is frequently encountered in regions along the Mediterranean Sea, in Central Europe, Russia and South Africa. Infection in the native-born population of North America has been considered to occur rarely.

The genus Strongyloides is a common genus of nematodes parasitic in numerous animals, including man. It is unusual in its life cycle in that it is parthenogenetic in its parasitic phase and normally has a bisexual generation outside of the host, thereby increasing the number of potential infective larvae. In addition, however, the bisexual generation may be omitted when the larvae developing from the eggs of the parthenogenetic female develop directly into infective larvae instead of free living adults. The conditions causing these changes, in spite of extensive investigations by various workers are still largely unknown, and many problems still exist.

In eastern Canada, the marine fishing industry is based upon the capture, processing, and distribution of groundfish stocks. The areas fished are ideal for the reproduction of the economically important species such as the gadids and the pleuronectids. The presence of a partially enclosed body of water, such as the Gulf of St. Lawrence is also ideal for the capture of the mature fish. The ice factor encountered in a climate of such extremes forms an interesting, enforced, natural means of conserving the younger stock by limiting the duration of the fishing season. [...]

This study embodies the taxonomic aspects of the Thelaziidae (Eye worms) from a collection of Brazilian birds. These small threadlike worms approximately half an inch long, inhabit various sites of the eye. Some were found in the orbit of the eye, under the nictitating membrane, in the conjunctional sac or free in the eye. The pathogenic effect of these nematodes in game birds has not yet been studied; the number of worms vary from few to many in each eye, and apparently their presence in the host's eyes cause no inconvenience. However, it seems that considerable irritation of the ocular membranes would be produced by the movements of these worms.

Thesis (M.S.)--University of Wisconsin--Madison. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 115-119).

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