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Show 1 9 0 4 .] FROM EAST AFRICA AND ZANZIBAR. fication. It is noticeable that none of the species here mentioned are new, although in other genera novelties have been abundant on these coasts. DORIDOPSIS TUBERCULOSA. [Bergh, Jour. Mus. Godeffroy, Heft xiv. 1878, pp. 38-40, and n S. R. xvi. 2, pp. 845-848.] Several specimens from the East and West Coasts of Zanzibar.. The following are the notes on one of the living animals Gill-pocket shaped like that of Asteronotus, 5-lipped. Gills five, quadri-pinnate, large, and brown. Rhinophores bent backwards, pockets raised at edges. Body soft but firm; grey with black patches; back covered with large compound tubercles. Under side of mantle and sides of foot a dirty brown with white blotches; foot lighter and without blotches. Free mantle-margin about 20 mm. A most handsome creature." The dimensions of the largest alcoholic specimens are, length 97-5, breadth 605, height 36 mm. The free mantle-edge is ample and the foot of moderate size (58 mm. long by 25 broad).. The colour is much as described in the living animals, but in two of the specimens the tubercles are plentifully besprinkled with black dots. The whole back is covered with compound tubercles,, which are smaller towards the mantle-edge. The rims of the rhinophore-pockets are prominent but not conspicuous; the club-of the rhinophores is set at almost right-angles to the thick stalk and bears 50-60 deep perfoliations. The branchial aperture is raised and stellate ; it can be almost closed by five triangular lobes which bear tubercles on the outside. The five branchiae are quadripinnate with remarkably stout stems. In one specimen there are six lobes and six branchiae. The anterior part of the foot is much retracted and distorted in all the specimens, but it appeai-s to be thickened and notched but not grooved. The buccal cone is 5-5 mm. long in the largest specimen. From it issues a long narrow tube (36 mm. by 2 mm.), bent almost into the shape S on the left side, with a smooth interior, which then dilates more or less clearly in different specimens into a sausagelike shape, 25 mm. long by 10 broad. The walls of this dilatation are strong and laminated internally. After it the digestive tract narrows again, and a tube 9 mm. long and 5 broad leads into the hollow of the liver. This organ is very large (51 mm. long by 38 broad), yellow, and distinctly bilobed behind. The mouth-gland is large, yellow, and with several lobes. The salivary glands are small, oval, and set at the top of the sausage-shaped dilatation. The single blood-gland is elongate and purple. The central nervous system is as usual in the genus. The pericardial laminae are distinct and yellowish. The albumen and mucous glands are very large: the vas deferens is thin, extremely long, and much convoluted. The verge is armed with numerous colourless spines, not much bent, rather irregular in shape and rising out of circular discs. P roc. Z ool. Soc.- 1904, Vol. II. No. XVIII. 18 |