374 SIR C. ELIOT OX XCDIBRANCHS [DeC. 1, 



round, very small, with a thick white liiii round it, so that in the 

 preserved specimen it resembles a dorsal tubeicle. The bipinnate 

 branchiae are somewhat scanty and irregular ; they are arianged 

 as in the diagram (PI. XXXIV. fig. 2), the three posterior plumes 

 being quite small. There is no labial armatui-e. The radula consists 

 in one specimen of 18 and in another of 24 rows ; in both specimens 

 the longest rows contain 26 teeth on each side ; the i-ows bend 

 downwards near the rhachis, the ten or twelve innermost teeth 

 being smaller and moi-e crowded than the others. All are simply 

 hamate except the outermost. These are rudimentary ; sometimes 

 they bear three or four long denticles and sometimes seem to be 

 split up into small separate rods. Thei'e is no trace of any 

 armature in the genital apparatus ; the organs aie small and 

 possibly even the largest specimen is immature. 



This form presents resemblances to Staurodoris, some species of 

 which have bipinnate branchije, but the dorsal tubercles are few, 

 and none are pr-esent round the pockets of the branchiae or rhino- 

 phores, both of which openings ai-e differently formed from those 

 of Staurodoris. 



17. Kentrodoris rubescexs B. (Plate XXXIV. fig. 7.) 

 [Bergh, S. R. X. p. 411.] 



Several specimens were obtained at Chuaka in August 1901. 

 The distribution was appai'ently very local and the species was 

 found only on this one occasion. The alcoholic specimens have 

 unfortunately been lost, but I give a figui-e drawn from the living 

 animal and the following notes : — 



The animal was large (about 17 cm. long and 5 broad), soft and 

 almost gelatinous. Its most remai'kable feature was the great size 

 and elevation of the seven quadripinnate gills, which were retrac- 

 tile into a lai'ge cup. Their tips were as much as 8 centimetres 

 above the level of the back. The mantle projected anteriorly and 

 formed an ample loose hood over the head. Tlie ground-colour was 

 a light pinkish drab with dull yellow spots and bi'own blotches 

 dorsally. There were also a number of thin chocolate lines running 

 more or less longitudinally but often branching latei'ally. The 

 under surface was of a light drab-brown, with similar chocolate 

 lines on the foot. The dark colour of the gills was due to a 

 multitude of such lines. 



The animals were infested by a numbei' of yellow parasitic 

 Copepoda. 



I think this animal is Bergh's Kentrodoris riobescens, though, a.s 

 the specimens are unfortunately lost, it is hard to be quite sure. 

 The huge erect gills are even a more prominent feature here than 

 in Sempei''s figui-e {loc. cit. pi. xxxiii. fig. 8). 



18. Platydoris eurychlamys B. 



[Bergh, S. R. xii. p. 510, Suppl.-Heft i. p. 6L xvi. p. 802.] 

 Two specimens from Chuaka. 



According to notes made from the living animal, the texture 

 was liard and rough. The larger specimen was 8 centimetres long 



