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Show 36G SIR C. ELIOT ON XUDIBRAXCHS [Dec. 1, the peculiar tubercles of T. villosa are absent; the general texture, though flexible, is not quite soft, but rather stiff'; the back is minutely granulate but not harsh. The rhinophore pockets are raised and have jagged edges. The branchial pocket is raised with round smooth edges, turned very distinctly outwards. The branchiae are six and tripinnate. The anterior pair are smaller than the others. The most characteristic feature of this specimen is the foot, which has a wide thin margin all round, dilated anteriorly into tentacular expansions, similar to those found in the Aeolididae, and 3-5 millimetres long. The front part seems to be grooved in the middle and the upper lamina to be attached to the head on each side. Admitting that it is dangerous to speak positively of such characteristics on the strength of a possibly distorted alcoholic specimen, I think it is clear that the anterior portion of the foot must be expanded in a way unique among the hitherto described species of Doridida?. The tentacles are thin and digitate. No labial plates were discernible. The buccal mass was large for the size of the animal. The formula for the radula appeared to be about 45.0.45 x 38. The teeth are the ordinary simple hamate type; the innermost are not smaller; the 3-5 outermost are degraded but are not serrulated. The stomach is large and free, laminated internally. There seemed to be traces of an inconspicuous armature of transparent scales on the glans, but I was not able to satisfactorily make out its arrangement. The dorsal spots in this specimen seem to resemble those described by Bergh in P. mauritiana, but this animal must be specifically distinct from that form. 8. PELTODORIS AUREA, sp. n. Three specimens captured near Wasin. The living animal is flat, with an ample mantle which extends far beyond the head and tail. The texture is not hard but also not flabby ; one specimen is much stiffer than the others. The general colour is a rich light orange, due to the back being covered with little flat orange warts on a sandy ground. At regular intervals round the mantle-edge are spots of dull violet; there is also a spot just in front of the gills and one behind the rhinophores. The underside is yellowish with a few brown spots. The dimensions are 2-2 centimetres length, and 1*4 centimetres breadth. Both the rhinophore and gill-pockets are somewhat projecting, but though they rise among tubercles they cannot be described as tuberculate. The gill-pocket is large, somewhat contracted in the middle and expanded at the sides, so that the 8 tripinnate gills fall in two bundles, right and left. The foot is l-6 centimetres long and only 3 millimetres broad ; grooved and notched in front. The tentacles are small and button-like. There is no labial armature. The radula is small and fragile : it consists of twenty rows, each containing about 25 white, simply hamate teeth ; the innermost and outermost are somewhat, but not conspicuouslv smaller. The |