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Show 362 SIR C. ELIOT OX NUDIBRAXCHS [Dec. 1, was probably of a different colour in life. It is noticeable that the tubercles in the middle are all large and not mixed with small ones. The mantle-brim is moderately ample, thick, and stiff, and bears numerous irregular tubercles on the lower side which are probably glandular in character. The rhinophore openings are indistinctly bilabiate, not much raised, and bear small tubercles on the sides and edges. The rhinophores are large, ample, and deeply perfoliate. The branchial pocket is also not much raised, indistinctly bilabiate, and at the same time with five irregular and not very distinct crenulations. There are tubercles on the sides but none on the edges. The branchiae are eight, tripinnate, but not ample: the two hinder-most are smaller than the others. The foot is large and broad, with a shallow groove anteriorly and a split upper lip. The tentacles, which are set at right angles to the head, are unusually large and long (5 millimetres). The labial cuticle is black, and corrugated but unarmed. The radula consists of 33 rows containing about 60 simple white hamate teeth ; the innermost are smaller, but the outermost are much the same size as the rest. No prostate or genital armature was discernible. There was a large purple double blood-gland, deeply cleft in both parts so that it seemed to have four divisions. 2. ARCHIDORIS MINOR, sp. n. One specimen from Wasin. There are no notes on the living animal. The alcoholic specimen is 2'9 centimetres long, 1*8 broad, and 9 millimetres high. The colour is rather bright yellow, with traces of a darker tint near the mantle-edge. The back is covered with flat warts, largest towards the centre, and decreasing towards the mantle-edge, but smaller ones are mingled with the larger ; they show indications of a lighter colour at the top. The underside is of a uniform yellow. Round the rhinophore pockets are two or three tubercles, which look as if they had been high in life. The rhinophores are high, straight, and narrow, strongly recalling Bergh's figure of those of Staurodoris januarii (S. R. Supp. i. plate C, fig. 14). The branchial pocket is slightly raised, bilabiate, and indistinctly crenulate. Though there are tubercles near the edge, these in no sense close over it or act as valves. The branchiae are eight, tripinnate, but high, thin, and scanty. The central papilla, also, is very high and thin. The foot is fairly broad, and grooved in front, with the upper lamina notched. The tentacles are small and conical. There is no labial armature. The radula consists of 30 rows, each containing about 50 long hamate teeth on either side of the rhachis ; the innermost are crowded and smaller, the outermost not much smaller. At the side of the base is a groove, terminating in a slight projection at the bottom of the hook. This specimen has many points of resemblance with Archidoris africana, but I a m inclined to think that it is specifically distinct, for the following reasons :-(1) The prevailing colour is yellow, |