Although the following Notes may appear elementary to practised writers, over thirty years' experience as an editor has convinced me that many authors need guidance in the preparation of their manuscripts and illustrations for publication and in dealing with their proofs.

1. Malaria parasites of the Plasmodium ovale type are recorded from Mauritius.

2. The chief differential characters between P. vivax and P. ovale are given.

3. Stress is laid on the difficulty of correctly diagnosing such an infection using the thick smear method.

1. During the period November 1936 to February 1937, eighty rabbits were examined, whilst from August 1937 to July 1938 another 446 were examined for nematodes. The following nematodes were found: Graphidium strigosum, Passalurus ambiguus, Trichostrongylus retortaeformis.

2. The incidence of the above three nematodes is given, and their seasonal incidence is discussed, with special reference to its ecological implication.

3. Evidence of host and age resistance is also demonstrated in infections with Graphidium strigosum, Passalarus ambiguus and Trichostrongylus retortaeformis.

4. The proportion of the sexes in Graphidium strigosum was found to be constant during both periods. The percentage of males in 1936–7 was 45·6 and 45·96 in 1937–8. In Passalurus ambiguus, however, the proportion of the sexes varied to a large extent.

1. Between November 1936 and February 1937, ninety-six rabbits were examined, whilst between August 1937 and July 1938, 446 rabbits were examined for cestode parasites. The rabbits were obtained from the same area.

2. The rabbits were infected with the following cestodes to the extent given, for the two periods respectively:

3. Two species of the genus Hymenolepis are recorded for the first time from the rabbit, and they are briefly described.

4. The seasonal fluctuations in the incidence of the above cestodes are discussed.

5. The span of life of both Cittotaenia pectinata and C. denticulata is seen to be not greater than 10 months, and evidence is given to show that the intermediate host of C. denticulata is available between April and December, and that of C. pectinata from August to April.

6. Evidence of host and age resistance is demonstrated in Cysticercus pisiformis.

In the present paper I have pleasure in describing three new species of mites of the genus Myobia, three new species of Listrophoroides, a new species of Listrophorus, and a new genus of Laelaptinae. Also there is the description of the female of Stanley Hirst's species Listrophorus bothae.

In view of the morphological similarity of T. evansi and T. brucei, including the sporadic occurrence of marked polymorphism in the first-named species, the hypothesis is advanced that T. evansi may have originated from T. brucei, by the introduction of the last-named species into localities free of Glossina and its subsequent propagation by direct passages.

The possibility of contact between the mammalian host of T. evansi, on the one hand, and Glossina and tsetse-borne trypanosomiases, on the other, is shown to exist in the Anglo-Egyptian Sudan, thus pointing to the source from which T. evansi in that country may have originated and providing circumstantial evidence in support of the hypothesis.

Attempts were made to discover whether T. evansi is capable of developing in Glossina. A total of 568 flies were fed on infected mice and examined at periods from 6 hr. to a fortnight following the infective feed. The results were entirely negative: not only is the trypanosome incapable of establishing an infection in the fly, but the majority of flagellates perish and are digested during the first hours after ingestion by the insect.

The behaviour of T. evansi in tsetse is shown to be similar to that of non-transmissible strains of trypanosomes of the Brucei group after prolonged maintenance by direct passages in the mammalian hosts, and is therefore also in keeping with the hypothesis.

Very little appears to be known—at least by students of intestinal protozoa, and general parasitologists—about the man whose name now lies entombed in the familiar flagellate genus Lamblia. We all know, of course, the organism to which this name was given by Blanchard in 1888, and we are all aware that it was dedicated to a person called Lambl, who is popularly supposed to have discovered it. We all know also that Blanchard's genus had been forestalled by Kunstler's Giardia (1882), though many of us continue to use the first name in everyday speech; while some of our less cautious writers, even now, continue to ascribe to Lambl the discovery of the intestinal amoebae of man.