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Show 2 8 8 SIR C. ELIOT ON NUDIBRANCHS [N o v . 2 9 , counting the small ones on the tail. The cerata are long, cylindrical, and transparent, allowing the ramifications of the liver to be distinctly seen. As noticed in the living animal, these latter are long and thin, with well-developed knobs or short branches. The rhinophores and tentacles are also long and thin; the former bear about 15 rings near the top, but are smooth below. The foot is very narrow, with thin projecting margins: in front it is expanded into a semicircular disk ; the anterior margin is grooved, and the corners are rounded. The jaws, which were examined in all three specimens, were transparent and very delicate. No denticles were to be seen on the edge, and, though it is hard to be certain of their absence in dealing with such slight and colourless material, it is to be observed that they were found without difficulty in other similar forms. The radula consists of a single series of horseshoe-shaped teeth numbering 23, 20, and 18 respectively, in the three specimens. Thin, pointed, lateral denticles extend almost up to the tip of the central cusp: there are as many as 20 on either side, but sometimes the number sinks to 15. I think these specimens should be referred to Phidiana, in spite of the doubt about the jaws, and should form a new species, chiefly characterised by the large number of lateral denticulations on the teeth. Also, the branches of the liver, which in other species are covered with knobs, seem to bear distinct short branches. F a c e l in a l in e a t a , sp. n. (Plate XYI. figs. 4 & 5 ; and Plate XVII. figs. 10 & 11.) Two specimens from Zanzibar. The notes on the living animal say that it had a general resemblance to Hervia lineata, which was caught about the same time, but the colours were brighter, and there was an orange-red ring-round each of the cerata near the tip. The rhinophores were jet-black. There were white lines on the body but not on the cerata, and there were three red blotches between the tentacles and rhinophores. The tail was long, and there was a very deep groove along the front of the foot. The largest of the preserved specimens is 6 mm. long and 2'5 mm. broad, but is evidently much contiacted. The colour is a uniform alcoholic yellow, except that the rhinophores are still black. The disposition of the cerata is not quite clear, as many have been lost, but appears to correspond with the drawing. The genital orifices seem to be below and between the first and second group, and the vent after the third. The cerata are longisli and cylindrical. The oral tentacles are large and thick, but are clearly much contracted, as are also the rhinophores, the perfoliations on which are not so distinct as might be expected from the drawing of the living animal (PI. XVI. fig. 4). The narrow foot is expanded at the sides into thin margins, and anteriorly into deeply grooved tentacular processes. |
