1. A new Caryophyllaeid cestode Adenoscolex oreini n.g., n.sp., from fresh-water fish, Oreinus sinuatus, is described.

2. Genus Bothrioscolex Szidat, 1937 is regarded as a synonym of the genus Khawia Hsü, 1935. The existing species of Khawia are listed and are briefly described.

In a critical review of the genus, the authors after studying ample material arrived at the conclusion that only four of the twenty-one species are valid. The shape of the testes is shown to vary from smooth to deeply lobed, and minor differences in the sucker ratios are considered invalid.

Of a total of sixteen Jackdaws examined, four were found to be infected with Trematodes. These yielded a total of five species, two of which are new to the British fauna, namely Urotocus thalonetensis and Tamerlania zarudnyi. The other parasites found were Platynosomum petiolaium, Lyperosomum longicauda and Prosthogonimus ovatus. With the exception of P. ovatus all the species are described in the text.

Chicken pens previously infested with eggs of Ascaridia lineata were sprayed with formulations containing sodium pentachlorophenate, an alkyl polyamine, and 2-benzyl-4-chlorophenol.

Six-week-old chickens were placed in the treated pens for eight days, then sacrificed. The larval ascarids recovered from the intestines were counted.

The ovicidal activity of sodium pentachlorophenate was manifest by almost 65% reduction of worm burden which developed in susceptible young chickens. The other compounds investigated appeared to be relatively ineffective.

Re-descriptions are given of the following species :—

1. Lyperosomum longicauda (Rudolphi, 1809) Looss, 1899.

2. Lutztrema monenteron (Price and Mclntosh, 1935) Travassos, 1941.

3. Dicrocoelioides petiolatum (Railliet, 1900) Dollfus, 1954.

4. Brachylaemus fuscatus (Rudolphi, 1819) var. nicolli (Witenberg 1925).

Previous host records for these trematodes are given.

A list is given of the host records made during the survey.

A new genus Morgascaridia is proposed for Paraspidodera sellsi Morgan, 1927, which is redescribed.

The systematic position of the new genus, and of the genus Schneidernema, is discussed and it is suggested that both should be referred to the family Ascaridiidae.

The systematic position of the family Ascaridiidae is considered and it is believed to show greatest resemblances to the families placed by Chabaud in the superfamily Ascaridoidea, and is accordingly referred to that superfamily.

1. A new species of Wuchereria is described, from the lymphatic systems of dogs, cats and Genet Cats (Genetta tigrina) on Pate Island off the Kenya coast. It is named W. patei after the island on which it was first discovered.

2. The new species belongs to the “W. malayi” group which are characterized in the microfilarial stage by the presence of one terminal and one sub-terminal nucleus in the tail; and in the adults by the presence of only 5 pairs of adanal papillae in the male and by the well-developed centre section in the left spicule.

Euparadistomum heischi n.sp., the sixth species in the genus, was recovered from a domestic cat on Pate Island, Kenya. In the Dicrocoeliidae, a new subfamily Euparadistominae is proposed for two genera, Euparadistomum Tubangui, 1931 and Stromitrema Skrjabin and Evranova, 1944.

One male and four females were recovered from the anterior part of the intestine of the house rat, Rattus rattus kijabius in Kenya. They were found to belong to an undescribed species of trichostrongyloid for which the name Longistriata (Brevispiculoides) kenyae is proposed. I wish to thank my friend Mr. W. F. J. McClelland for the material, and Professor J. J. C. Buckley for his interest in the work.

A brief redescription is given of Pulmostrongylus herpestis (Khera, 1956) recovered from the pleural cavity of a mongoose, Herpestes sp. from Suva, Fiji. The genus Herpestostrongylns Khera, 1956 is shown to be untenable and placed as a synonym of Puhnostrongylus Hsu, 1935. The genus Acanthoxynema Khera, 1956 is shown to be a synonym of Skrjabinema Vereshchagin, 1926; and the genus Papillosclerus Khera, 1956, a synonym of Metathelazia Skinker, 1931. and its subfamily Osleriinae Khera, 1956 is supressed.

In a review of the genus Encyclometra, only three species are considered to be valid : the genotype Encyclometra colubrimurorum (Rudolphi, 1819) Dollfus, 1929 ; E. japonica Yoshida and Ozaki, 1929 with synonyms E. microrchis Yamaguti, 1933, E. koreana Park, 1940 and E. vitellata N. K. Gupta, 1954 ; and E. asymmetrica Wallace, 1936. The intestinal caeca are shown to be a constant, useful and reliable character to differentiate the various species in the genus. In the light of some new information, the genus is slightly amended.