The parasite forming the subject of the present paper was discovered inhabiting the alimentary tract of larvae of the common rat-flea of this country, Ceratophyllus fasciatus Bosc. (see Pl. IV).

Whilst examining the contents of a number of insects from the neighbourhood of Pretoria (Transvaal), a flagellate was found occurring in the alimentary canal of a Hemipterous insect, Cletus varius Dall1. Unfortunately, no observations were made on the living parasite and the following notes on its morphology are only derived from the study of ordinary dried smears, fixed in alcohol and stained with Giemsa. In consequence of the method of preparation, the finer nuclear details have been destroyed, but nevertheless we have been able to make out the main points in the structure of this parasite, and as no further material is available we have decided to publish our results in their present form.

In my “Revision of the Genus Stilesia” I had to leave several points in the anatomy of Stilesia globipunctata (Riv.) undecided, as the material I had of the worm was too macerated to allow of any definite conclusions. At the same time I pointed out, that the topography of the male canals as described by Stiles and Hassall disagreed with the conditions obtaining in Stilesia hepatica Wolffhügel, in other respects a very closely related species. The necessity for a re-examination of Stilesia globipunctata (Riv.) in order to decide whether the differences really exist, or whether they were supposed to do so, on account of the material examined by Stiles being rather macerated (loc. cit. p. 74), was all the greater as Stilesia globipunctata (Riv.) is the type species of the genus Stilesia. Through the kindness of Mr Littlewood, Chief Inspector of the Veterinary Department, I was able to obtain living examples of Stilesia globipunctata (Riv.) at the Cairo abattoir on Jan. 27, 1912. These worms have been fixed with Zeuker's solution, hardened and cut.

The following generic names of animals reported as parasites of man have been submitted to the International Commission on Zoological Nomenclature, by the Helminthological Society of Washington, for inclusion, in the “Official List of Zoological Names”:

I have been following the valuable contributions which Hindle has recently been making to the literature of spirochaetosis and I have been specially interested in his paper on the above subject which appeared in Parasitology, vol. IV. p. 463. I wish to make a few comments upon some of his findings and conclusions.

The nomenclature of the parasitic flagellates of invertebrates is in such a state of chaos at the present time, that I have collected the history of the three more important genera Leptomonas, Herpetomonas, and Crithidia, in the hope that it will end the controversies which surround the application of any one of these names.

On clinical grounds alone sufficient evidence is available to postulate that European relapsing fever and Central African tick-fever are caused by different, though closely allied, organisms. However, as the spirochaetes of both diseases are morphologically identical (Schellack, 1908; Darling, 1909), I should like to record some experiments and observations I made during the winter of 1910–11 in Moscow, so as to give an exact impression of the difficulty or ease with which Spirochaeta recurrentis can be transmitted to mice when compared with S. duttoni under the same conditions. Moreover, I wish to describe some appearances in S. recurrentis, the exact counterpart of which have not so far been published in the case of any blood spirochaete.