1. A six year old child living in Singapore was found to be infected with the cestode Bertiella studeri.

2. Apparent cure was affected by use of Dichlorophen.

1. A new species of Brugia (Brugiella subgen. nov.) buckleyi is described from the heart and blood vessels of the Ceylon Hare (Lepus nigricollis singhala).

2. This worm is much larger than the other species of Brugia. It lacks a distinct head bulb and has a relatively much shorter oesophagus. The vulva in the female is close to the posterior extremity of the oesophagus. In the male the caudal papillae differ in their number and arrangement and the spicule ratio is much smaller.

1. An unusual type of brood capsule is described with the cuticle on the outside and with 70 scolices which are fully developed and projecting outwards. The brood capsule is much larger than the normal brood capsule.

2. This type of brood capsule has been described earlier in cultures by Coutelen (1927) and a similar mode of origin has been suggested for this particular brood capsule.

Studies were made on the bacteriostatic action of the parasites F. giganilca and A. vilulorum against some animal micro-organisms. From the result of this work, it would appear that both parasites possessed some bacteriostatic action against certain organisms while others had none.

1. Skrjabinotaenia cricelomydis n.sp. is described from 18 specimens taken from Cricetomys gambianus Waterhouse, near Ibadan, Nigeria.

2. Apolytic proglottides are described and also some details of development of the eggs.

3. Details of the anatomy are given and their significance in deciding the relationship with other genera and species is discussed.

4. The regrouping of a number of species into the genus Skrjabinotaenia is proposed.

5. The diagnostic features of the genera Catenotaenia and Skrjabinotaenia are restated.

A new cestode, Paradilepis maieki sp.nov. is described from the intestine of a Sacred Ibis in the Sudan, and differentiated from the other nearer species.

This new species is a rare parasite of the freshwater fish Clarias lazera Cuvier and Valenciennes. Twenty-four fishes from the White Nile and the Blue Nile from Khartoum area in the Sudan were examined from October, 1957 to May, 1958. Only five fishes, all from the White Nile, were found to harbour this new species and each fish contained not more than two worms.

Several females of this new species were collected by the writer from the stomach of the Nile fish, Gymnarchus niloticus Cuvier from Khartoum in the Sudan, on June, 1958. Three males and several females were collected from the same host and locality, by Dr. Hilmy Bishai of the Zoology Department, University of Khartoum on March, 1960 and forwarded to the writer.

In an attempt to demonstrate experimentally the life cycle of Fasciola gigantica, the snails Lymnaea natalensis were exposed to newly hatched miracidia of this trematode.

Cercaria pseudocellata Szidat and Wigand, 1934; C. bilharziellae polonicae Szidat, 1929; C. kenilworthensis n.sp. and C. edgwarensis n.sp. are recorded from London. Descriptions of the two new species and a comparison with related forms is given.

1. The behaviour and development of Brugia patei has been followed in the mosquito host, Mansonia uniformis, from ingestion of the microfilariae to the development of the infective stages.

2. The microfilariae penetrated very rapidly out of the stomach into the abdomen of the mosquito; 80% of them escape from the stomach during the first 50 minutes after a blood meal.

3. The microfilariae migrate from the abdomen to the thorax through fat body cells and the heart during the first 140 minutes followed engorgement and begin to penetrate the indirect flight muscles within 15 minutes from engorgement. During this migration microfilariae were found in close association, suggesting that they follow similar pathways of migration through the body of the mosquito.

4. Most microfilariae (98%) have settled in the indirect flight muscles within 2 hours of engorgement. In these muscles the larvae digest away the muscle surrounding them but do not begin to elongate until the third or fourth day after the blood meal. The rate of development varies from one mosquito host to another, but about 80% of the larvae have developed to the infective stage by the ninth to tenth days after the infective feed. The infective stages concentrate in the head and proboscis of the mosquito vector. The development of B. patei is faster than that of B. pahangi in mosquitoes from the same colony.

5. The efficiency of M. uniformis as a vector of B. patei is compared with the similar efficiency of M. longipalpis as a vector of B. malayi. In both mosquitoes the majority of the microfilariae ingested develop to the infective stage. M. uniforms is also an efficient vector of B. pahangi.

6. The development of the parasite is discussed briefly with reference to knowledge of the physiological events within the mosquito host subsequent to the blood meal.

1. A new genus and species of Isoparorchiidae Poche, 1926, is described from the air-bladder of the marine catfish, Anus jella (Val.), caught off the coast of Waltair, India. The new fluke is named Elongoparorchis pneumatis.

2. The new genus Elongoparorchis bears a superficial resemblance to the genus Isoparorchis Southwell, 1913, but differs appreciably in the structure of the testes, the ovary and the vitellaria to warrant the separation.

Pulmoverminae is proposed as a new subfamily within the Hemiuridae Lühe, 1901, to receive the genera Pulmovermis Coil and Kuntz, 1960 and Hydrophitrema Sandars, 1960. The genera are compared, and considered to be distinct.

A modified form of the Seinhorst “Mistifie.” is described which allows the quantitative recovery of nematodes from infested material. Experimental results are given showing the high rate of recovery in a short time, the recovery from a known number of nematodes and a not excessive degree of variation between recoveries from a replicated series of mistifier units. These results are discussed and the value of the technique for replicated quantitative work is stressed.

Two out of three guineapigs received some degree of protection against an oral dose of A. suum eggs after the intraperitoneal injection of immune anti-Ascaris guineapig serum.

1. An introduction to a study of immunity against A. suum in the pig is given. A review of the literature on the life cycle, a note on terminology and a general discussion on immunity to helminths has also been included.

2. By first removing the procomplementary activity of pig serum to guineapig complement with hydrochloric acid, it was possible to apply the complement fixation test to a study of the antibody response to experimental infection with A. suum.

3. Using an alcoholic extract of uterus, oviducts and ovaries of the adult female Ascaris worm as antigen, antibodies against this nematode were first detected in two experimentally infected pigs ten days after infection. A peak of antibody concentration from the thirteenth to the seventeenth day of infection was followed by a decline in the antibody content of the serum to the forty-first day; after which no antibody was detected.

The material described in this paper consists of ten mature males and ten females obtained from the intestine of a Colobus monkey (Colobus sp.) which died on its way to London, from West Africa. The specimens were collected at the London Zoo Prosectorium. On detailed study, they proved to belong to two different, hitherto unknown, species of the genus Enterobius. These two species differ markedly in the length and shape of the spicule and number of caudal papillae. There are six males and a number of females of one species, which is named E. pesteri n.sp and two males of another species, E. inglisi n.sp.

One male and three female specimens belonging to the genus Amplicaecum were present in a collection of nematodes in the British Museum, Natural History, made available to me through the courtesy of Dr. W. G. Inglis.