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Show 1)8 SIR C. ELIOT ON NUDIBRANCHS [May 17, first lateral is large and clumsy: the rest are of the ordinary hamate shape. The internal organs are whitish. From the large buccal mass issues a tube 14 mm. long and nearly 5 mm. wide. The interior is lined with folds, and there is a pouch-like diverticulum in the floor immediately after the buccal mass. The tube is of much the same size until it dilates into the small stomach (7-5 mm. x 5-5 mm.), which is under and partly within the liver. The stomach has a girdle of more than 100 plates, very thin and membranous, and all of about the same size, namely, 3 mm. along the base and 1 ‘5 high. They lie in groups so as to produce a superficial impression of about 12 thick plates. The intestine is large. M a r io n ia vir id e sc en s , sp. n. [? = Tritonia hawaiensis Pease.] One specimen from near Wasin. The notes on the living animal are as follows:-" Sides of foot light greenish brown, netted with light bright green, which becomes white near the edge of the back. There is a broad line of opaque white and green (a mixture resembling verdigris), which sends out prolongations to the bases of the branchiae. Apart from this line the colour is reddish brown with a greenish network and white spots. This coloration extends into the main stems of the branchiae, but the finer ramifications are white and the finest of all bright pinkish brown. The whole coloration is strikingly beautiful. The velum bears seven processes on each side; only the largest are branched. The rhinophores project but little from their pockets, which are as in M. albo-tuberculata. The branchiae are kept moving continually, expanding and contracting. The animal is about 4 inches long." The preserved specimen is 42 millimetres long, 21 broad, and 14 high. The shape is not tapering. The back and the sides bear small flat tubercles. The velum is large ; besides the two small grooved tentacles it bears on each side seven processes, the largest of which have 2-4 short branches. The central space is wide and bears four rather indistinct tubercles not amounting to processes. The rhinophores are entirely retracted, and the club is surrounded by six bipinnate plumes. There are ten pairs of branchiae, of which the fourth is the largest; they still bear traces of green colour. The stout and strong main stem divides into four branches, each of which bifurcates, and each bifurcation is then 3-4-pinnate. The arrangement of the smaller tufts is simpler, but none are rudimentary. The foot is very narrow, being, as preserved, only 2*5 mm. wide. The mouth is large and open, showing the jaws. It is surrounded by a circular disk with thin free margins. All this portion of the specimen seems to have been somewhat distorted by the preserving fluid. The jaws are 9 mm. long and bear a single row of coarse denticles, of which ten are very large, the rest gradually decreasing |