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Show 1 9 0 4 .] FROM EAST AFRICA AND ZANZIBAR. 2 9 5 sides were folded over the body, but 23 when they were extended. The ground-colour was mainly whitish, but on the dorsal surface this was almost entirely hidden by the numerous dark green branchial ridges. The outer surface of the lateral expansions was sandy coloured with darker spots, and on the foot were many irregularly-arranged deep black spots. Along the junction of the lateral expansions and the foot ran a line of violet rings, and there were four or five more on the forehead. The inside of the furrowed rhinophores was violet, as was also the end of the body. The animal secreted a very abundant mucus. In the preserved specimen the branchial ridges are very large and distinct, being as much as 1'5 mm. high. There are about 36 main folds, and smaller ones in between. The buccal mass is small, only about 1 '5 mm. long, and the crop half that length. The teeth are exactly as figured by Bergh, with about 12 denticles on the margin, but are less numerous than in his specimens. In the radula I found 15 and 14 respectively, and in the heap at the bottom about 40 and 50. Two pencil drawings by Mr. Crossland are reproduced because they show the animal in a somewhat different attitude from that in which it is ordinarily represented. E l y s ia f a u s t u l a , B. [B. in S. R. iv. pp. 186-190.] One specimen from Wasin, East Africa. There are unfortunately no notes on the living animal. The preserved specimen is very flat and crinkled, surprisingly like a planarian in appearance, and also somewhat resembling Triclachia, but the wings show no signs of being joined behind the neck. The length is 19 and the breadth 16 mm., but the form has become somewhat contorted, and these measurements represent at least 25 and 20 if it were straightened out. The colour is a uniform pale yellowish grey, with a very distinct deep black border all round the edge, and a few scattered black dots on both the upper and lower surface. There are three black dots on the pericardial prominence, and the anterior margins of the tentacular groove are black. There is a fine furrow dividing the foot transversely just below the point where the wings arise, behind which the foot is not clearly differentiated from the sides of the body. The anterior margin of the foot is not expanded into tentacular processes. From the rather large pericardial prominence issue three vein-like ridges on each side. The two anterior pairs are simple and have only very slight ramifications near the edge of the wings. The third pair soon divides into three main branches, which have one or two secondary ramifications. The tentacles are rather large and broadly opened. The radula consists of 17 teeth, besides which there is a heap of about ten disused ones. The shape is exactly that given in Bergh's plates (in S. R. iv. pi. xxii. figs. 15-17), elongate, and with no trace of denticulations. I think this specimen may be certainly referred to E.faustula B., |