Six species of Trichostrongylidæ are described in this paper. Four are previously recorded species which were insufficiently known and described.

It has long been held—and rightly so—that Calabar swellings are caused in some way or other by adult Loa loa moving about in the subcutaneous tissues.

During the month of July, 1921, I had the opportunity of working with Dr. Annandale on the molluscs of Loch Lubnaig and Loch Vennachar in Perthshire, Scotland; and I was able to study carefully the two cercariæ infecting Limnæa peregra Müll. The material was examined in the living condition. Some of it was fixed in sublimate acetic and preserved in alcohol for subsequent study in sections.

Japanese observers have found the encysted cercarire of Heterophyesnocens in the Japanese mullet which belongs to the genus Mugil. In Egypt, Heterophyes heterophyes is a fairly common parasite of man, dog and cat. The genus Mugil “Egyptian mullet” is represented in Egypt by three species.

While engaged on work with the Filariasis Commission in British Guiana in 1921, under the direction of Professor R. T. Leiper, the writer had occasion to examine a number of birds and mammals, and from these eleven species of Entozoa were collected. Three species are new to science, and one of these, an Oxyurid from Pithecia monachus, has been placed in a new genus Trypanoxyuris.

Page 89, Legend to Fig. 13, add “ B and C after Molin.”

Page 126, line 16 from bottom, for “.01 ” read “. 1. ”

Page 134, line 11 from top, for “ Fig. 1 ” read “ Fig. 2.”

Page 144, line 3 from top, for “ Endoparasitic in stem tissue of ” read “ Ectoparasitic on,”

Page 147, line 9 from top, delete the words “ enters the stem tissues and.”

Page 168, line 2 from bottom, for “.66 ” read “.46.”