Stammerinema suffodiax sp. n. is described from the dasyurid marsupial Antechinus stuartii. It differs from S. soricis, the only other member of the genus, in lacking lateral body spines, as vyell as in the spicules and characters of the anterior extremity. As well as red escribing Synfiimantus australiensis (Johnston and Mawson, 1952) now collected from the stomach of A. stuartii, a new capillariid, Capillaria rickardi from the stomach and two cestodes Hymenolepis aklei sp.n. and H. bradleyi sp.n. are described from the same host.

The fertility, mortality, and migration patterns of Heterakis gallinarum were studied in chickens with concomitant Parahistomonas wenrichi infections. H. gallinarum females were found to produce approximately 936 ova per day, when 50 days of age, and a total of 34,000 to 86,000 ova in a lifetime. There was no evidence of differential mortality between the sexes, nor of a preference for either the left or the right caecal organ of chickens. Both male and female worms are capable of migrating between caeca, and are especially prone to do so when in the absence of individuals of the opposite sex.

Experiments were conducted to assess the effect of sublethal concentrations of niclosamide on the infectivity of Schistosoma mansoni cercariae. Exposure of cercariae to 0.02 mg/1 and 0.05 mg/1 of niclosamide, respectively, for only two hours increased their mortality during penetration of mammalian host skin. The observed increase in mortality in the skin resulted in a consequent reduction of adult worm recovery from the liver and mesenteric veins of animals infected with the treated cercariae.

Observations have been made on the morphology of Bothriocephalus scorpii from littoral fishes in Britain, with particular reference to the reproductive system and the ultrastructure of the tegument. Two different kinds of microtriches, and ciliated sense organs, have been found. The shedding of proglottides by pseudoapolysis is described.

Breinlia booliati exhibited nocturnal subperiodicity in its natural host, Rattus sabanus in contrast to experimentally infected laboratory-reared albino rats which showed irregular fluctuations of microfilariae throughout the 24 hour cycle. All the infected albino rats showed a prepatent period between 11–14 weeks postinoculation. Three patterns of microfilaraemia were discerned during the course of infection. 38/49 rats displayed a single peak, 4/49 displayed 2 peaks about 12–15 weeks apart and 7/49 showed a sustained high plateau-like pattern of microfilaraemia.

Cortisone had no effect on microfilarial levels when administered to rats near postpatcncy and some at postpatency.

A detailed redescription of Gazellostrongylus lerouxi and Paracooperia serrata was given from specimenscollected from antelopes in Kenya. It was felt that there was no justification for the synonymy of the genus Gazellostrongylus with Paracooperia. Gazellostrongylus was placed in the tribe Ostertagiea.

Alkaline phosphatases from different trematodes occupying the same habitat have identical pH optima but different levels of enzyme activities. Isoparorchis hypselobagri, from the fish Wallago attu, shows four to six times more enzyme activity than Fasciolopsis buski, Gastrodiscoides hominis and Echinostoma malayanum, from the pig Sus scrofa, and Fasciola gigantica, Gigantocotyle explanatum, Cotylophoron cotylophorum and Gastrothylax crumenifer, from the buffalo Bubalus bubalis.

At least two peaks of activity at different levels of pH were obtained for each trematode examined. Both Gastrodiscoides hominis and Isoparorchis hypselobagri enzymes had three peaks of alkaline phosphatase activity.

The optimum temperature for maximum enzyme activity was 40°C, above which rapid inactivation occurred. At temperatures below 40°C, the enzymes of fish and mammalian trematodes did not behave similarly; I. hypselobagri enzyme being active over a wider range of temperature (20°–40°C.

Various concentrations of KCN and arsenate proportionately inhibited enzyme activity. NaF did not significantly influence enzyme activity, while Mg++ and CO++ acted as activators. The extent of inhibition or activation of enzyme activity of different trematodes varied, probably due to species differences. Both inhibition and activation of I. hypselobagri enzyme was higher than in the case of other trematodes.

Two cases of Nasitrema sp (Trematoda) infection of the bottlenosed dolphin, Tursiops truncatus, are reported and N. attenuata is briefly redescribed. The adults of the trernatode occurring in the nasal sinuses and posterior nasal passage of the dolphins are considered as practically harmless for the host but their eggs, aspirated deep into the bronchial tree, may initiate a foreign-body type of inflammatory reaction in the lungs and continuous aspiration of such eggs may provoke a chronic pneumonic condition.

Fresh eggs obtained from female Nematospiroides dubius were cultured at temperatures ranging from 5°C to 33°C. Hatching occurred between 5°C and 30°C; third stage larvae were obtained between 5°C and 25°C. The minimum time required from hatching to development to the third stage was 3.6 days (at 20°C) and the maximum was seven days (at 5°C). Larvae cultured at higher temperatures were smaller than those cultured at lower ones.

The effect of the sex of the intermediate host on the growth and development of the metacestodes of Taenia crassiceps has been investigated. Three different strains of mice were used, the C R S, L A C A and C F L P strains and two strains of metacestode, the Toi and the E R S strains.

The results show that metacestodes of T. crassiceps grow and multiply more rapidly in female than in male mice, although both sexes are equally susceptible to the infection. The origin of the parasite, i.e., from a rat or mouse host, affects the parasite growth.

Gould (1970) stated that “asyet,roentgenographic technics cannot demonstrate trichinae in skeletal muscle”. We have found no report of X-ray film demonstration of Trichinella cysts in muscle in the literature to date. Rogers et al. (1975) used the technique of xeroradiography to show living and calcified filarial worms (Brugia pahangi) in the infected lymphatics of cats and we have had an opportunity to use this method to examine calcified Trichinella cysts in infected muscle.