This survey is a continuation of that carried out by Morgan (1924–25). The area covered, however, is more extensive, and the investigation extends over a period of four years (October, 1924 to October, 1928).

A preliminary publication recording the discovery of mustard as a factor influencing the cyst formation of Heterodera schachtii, and describing various experiments to demonstrate the effects of this factor, has already been made. Mustard seedlings grown to a height of about three inches and then broken down in soil in which a potato plant was immediately thereafter grown, were found to exert some influence on the development of the nematode, which partially inhibited the formation of cysts on the roots of the potato plant. The reduction in the number of cysts developed on the roots of a plant so treated, as compared with a plant grown in infected soil without mustard, was found to average over 60 per cent.

The genus Subulura was established in 1860 by Molin for a nematode from Scops brasiliannus and at the present day includes some forty species, mostly in birds. Five species have been reported from primates. Three of these are little known and are still only provisionally retained within this genus. These are S. sarasinorum (from Loris), S. otolicni (from Galago) and S. perarmata (from Tarsius). They are discussed below. The remaining species S. distans (from Cercopithecidæ) and S. jacchi (from Cebidæ and Hapalidæ) are of sufficient importance to merit fuller consideration. The first-mentioned is only incompletely known although the second has been recently re-described by Barreto (1919). During an expedition in 1928 to the Lesser Antilles, I was able to collect a large number of specimens of Subulura from the African Monkeys in St. Kitts. These, together with specimens of S. distans and S. jacchi in the collections of the Department of Helminthology of the London School of Hygiene and Tropical Medicine, provided the material on which this paper is based.

The following collection of Cestodes has been brought together by Prof. A. S. Pearse, of the Duke University, Durham, N.C., during a sojourn in Nigeria for the purpose of studying the parasites of rodents and insectivores.