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Show 404 SIR C. ELIOT ON NUDIBRAXCHS [Mar. 1, Since writing the description of this species I have examined another specimen, found at Mombasa at low tide. It is strongly arched, and of a sandy-brown colour with patches of darker brown. Near the branchial opening are a few bands of minute black spots, almost invisible except under a lens. On the dorsal surface are 22 pits, scattered quite irregularly round the margin and in the middle. The preserved specimen has a small ridge between the rhinophores, not extending before or behind them, and possibly due to contraction after death. Around the branchial pocket is a circular area, marked off from the rest of the back by being somewhat flatter and lighter in colour. This feature was not found in any of the other specimens. Genus ORODORIS. This genus, which Bergh regards as allied to Miamira, has the oval shape, wide mantle-margin, and tripinnate branchiae of an ordinary Dorid. The dorsal surface bears ridges and tubercles. The mouth-parts show some affinity to Chromodoris. There is a labial armature composed of bent rods, and the rhachis of the radula presents thickenings. The innermost teeth are denticulate on both sides, the next few on the outer side only, and the rest are smooth. ORODORIS MIAMIRANA B. [Bergh, " Neue Nacktschnecken," Jour. Mus. Godeffroy, Heft viii. 1875, pp. 67-71.] One specimen from N e w Britain, kindly given me by Dr. Willey. It is, as preserved, of a uniform olive-green, with a few white spots on the foot and underside. The length is 58, the breadth 32, and the height 26 m m . The foot does not project beyond the mantle; it is deeply grooved in front and is broad, measuring 15 m m . across without counting the margins, which are turned inwards. The dorsal surface is arched, and the greater part of it is covered with composite tubercles. Over the head and round the edge of the mantle are many smallish tubercles roughly arranged in three rows. There is one large tubercle somewhat resembling the terminal lobe of Miamira over the tail, but no corresponding formation at the other end. Down the middle of the back runs a thick ridge, in which is set the large branchial opening. It bears six tubercles, one rather small one between the rhinophores, then two more small ones, followed by two lar°-e ones; then comes the branchial pocket, and behind it is another large tubercle. From this central ridge three transverse ridges, also composed of compound tubercles, run to the sides. The branchial pocket has a raised rim roughly circular but wavy in outline. Bergh gives the branchiae as 7 ; in this specimen there are three on each side, an open space behind, and in front a very broad plume with a small accessory plume at its side. The anal |
