98 SIR 0. ELIOT ON NUDIBRANCHS [-^^^7 ^ '^ ^ 



j£rst 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 1 2 thick plates. The intestine is 

 large. 



Marionia viridescens, 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 



