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In the following pages I shall endeavour to describe the present state of our knowledge of Bilharziasis in Natal and the result of some personal observations extending over the last seven years. The investigations of the Bilharzia Mission to Egypt have drawn attention to the various forms of cercariae which infest several species of fresh-water snail in African rivers. The cercariae which give rise to Bilharzia disease in Egypt are furcocercous cercariae, i.e. they possess a. tail which is divided for a greater or shorter portion of its length. They are characterised, further, by the absence of a pharynx at the commencement of the oesophagus. Similar cercariae are present in one of the species of fresh-water snail which abounds in the infected areas of Natal.
1 Journ. Roy. Army Med. Corps for 1915—July, August and September.Google Scholar
1 Zeitschr. f. wiss. Zool. IV. pp. 53, 72–76, 454.Google Scholar
2 Med.-Chir. Trans. London, XLVII. pp. 55–72, 2 pls.Google Scholar
3 Ibid. LIV. pp. 47–62, 1 pl.
4 Brit. Med. Journ. II. pp. 89–92.Google Scholar
5 Practitioner, XL. pp. 310–320.Google Scholar
1 Tokio Med. Journ. Sept. 1913.Google Scholar
1 Brit. Med. Journ. Jan. 30, 1915.Google Scholar
2 Journ. Roy. Army Med. Corps, 1915.Google Scholar
3 Brit. Med. Journ. March 18, 1916.Google Scholar
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