At the beginning of 1917 Professor V. Dogiel kindly handed over to me, for scientific treatment, a series of blood-films taken from different Amphibia, Reptilia, and Mammalia by the Expedition of Professors V. Dogiel and I. Sokolov to British East Africa in 1914. The films were examined by me for blood parasites, with the result that, of 27 animals, two different species of Bufo and two snakes proved to be infected. The blood parasites were represented by haemogregarines exclusively. The blood-films had been fixed on cover-slips by the dry method, and preserved in that condition for nearly three years. Altogether, I had at my disposal only 24 slips with blood-films taken from the peripheral blood of the infected animals.

During the summer of 1914 and during the months January to April, 1920, I have been able to investigate the Myxosporidian parasites of fish occurring at Plymouth, and I am glad to take this opportunity of thanking the Ray Lankester Trustees for their grant in aid of this research, and also to express my gratitude for the very valuable and kind assistance afforded me by the Director, Dr E. J. Allen, and staff of the Marine Biological Station at Plymouth, where the researches were carried out. The assistant Mr Smith helped me very considerably in the identification of the fish examined.

This short account of the capitulum and mouth-parts of Psoroptes has been prepared as a preliminary to investigations which are being made upon the bionomics of the Itch Mites. None of the published figures or descriptions are complete. The best is that of Mégnin.

In August, 1920, Dr Andrew Balfour, C.B., C.M.G., Director of the Wellcome Bureau of Scientific Research, received from Mr A. Pomeroy, F.E.S., Official Entomologist in South Nigeria, a tube containing some parasites from the “fore-gut” of a Cobra (Naia nigricollis Reinh.) from Ilaro, South Nigeria. Dr Balfour kindly handed these specimens to me for examination. The specimens were few in number, comprising only ten Nematodes and the two examples of Porocephalus described in the present Note. One of these examples at once attracted my attention by reason of its remarkable external form (Text-figure 1, A). I have consulted most of the available literature dealing with Porocephalus and the figure which, so far as I have discovered, most nearly approaches that of the present specimen is that of P. annulatus Baird, supplied by Shipley (his Text-figure 5, p. 59) in his memoir on the Linguatulidae. From my reproduction of Shipley's figure (Text-figure 1, C) it will be seen that Porocephalus annulatus, like the new species nowto be described, has a very narrow “neck,” but whereas in P. annulatus this neck is very short, in the new species it is comparatively very long; moreover, whereas in P. annulatus the cephalo-thorax (prosoma) is not longer than broad (or only slightly so in some specimens) and the first annulus of the “abdomen” (opisthosoma) is certainly no larger than succeeding annuli, in the new species the prosoma is roughly three times longer than it is broad and the first annulus is at least twice the size of the third at any succeeding annulus.

This memoir presents the results of the study of a number of specimens of Filariid worms from Cattle and other Ruminants which had accumulated during the last few years from various collections of Nematodes, sent to me for identification and laid aside for further investigation.

While I was in Egypt conducting investigations into the etiology of dysentery with. Captain F. W. O'Connor at Alexandria in 1916 I was able to make some observations on the intestinal protozoa of three species of lizard. The occurrence of an Entamoeba and a Chilomastix (Tetramitus) in one of these, Agama stellio, was mentioned in our publication on the Human Intestinal Protozoa in the Near East, p. 147 (1917). The other lizards investigated were Chamaeleon vulgaris and Lacerta agilis. I will describe the observations on the protozoa under their respective hosts.

Most of the observations recorded in this paper would have been published in 1915, if my duties as a doctor and as an officer had not called me to the Army.

This amoeba was found in the large intestine of a Macacus cynomolgus, that was killed because it suffered from paralysis of the hind legs and emaciation. The autopsy showed these symptoms to be dependent on a general tuberculosis, in which, besides many other organs, the spinal matter was involved. Microscopic examination of the intestinal contents revealed the presence of motile amoebae and cysts. Except some small tubercular foci in the serosa no pathological lesions could be detected in the intestine. Close examination of the mucosa failed to reveal any ulceration; blood and mucus were totally absent.

The present paper is the outcome of my examination of a collection of trematodes from various parts of Japan (including Formosa). The species of monostome came from a turtle caught in Singapore. Of the material certain species are left unidentified chiefly owing to the paucity of specimens. It may be mentioned that in the following description the parasites are arranged according to their hosts.

The Ascarids parasitic in snakes present considerable difficulties from the systematic point of view, owing to the incomplete character of many of the descriptions, and to the state of confusion which has long existed in the nomenclature. The writer has made an attempt, by examining such material as was available, and by comparing a number of the existing descriptions, to clear up some of this confusion. It was hoped also that such a comparative treatment would throw some light on the systematic value of the modifications of the female genital apparatus, which occur in some of these forms.

Mr C., who has lived for ten years in the tropics, was under the care of Dr de Jong and myself for chronic amoebic dysentery. Some five years ago he suffered from an abscess of the liver, readily cured after operation. Before this abscess he had never noticed any dysenteric symptoms, but afterwards he often had mild, or sometimes more severe, attacks of recurring dysentery, most times without fever. During the attacks, the bloody slime contained a great number of amoebae, principally of Entamoeba histolytica and containing erythrocytes. With an “emetine cure” the attacks regularly subsided; but between two attacks the patient produced constantly a great quantity of so-called “minuta forms” and 4-nucleate (“tetragena”) cysts of this species in the faeculent parts of the stools. After an emetine treatment I often found a rather sudden increase in the number of cysts (always measuring from 11·5–13·5μ), sometimes to a tremendous amount. Several times we tried to get rid of the amoebae by a cure with emetine bismuthous iodide, but without success, so the patient stayed under observation and regularly sent us his stools for control.

In the foregoing paper Dr E. P. Snijders has described the oöcysts of a species of Eimeria which he found in the stools of a patient under his care in Medan (Sumatra). The manuscript of this paper, together with a preparation containing the cysts in question, was kindly sent to me by the author with the request that I would “be so kind as to add my opinion, and give to the species its right name.” I shall do my best to comply with both these requests in the present note.