374 SIR C. ELIOT ox XUDIBRANCHS [Dec. 1 , 



round, veiy small, with a thick white rim round it, so that in the 

 preserved specimen it resembles a dorsal tubei'cle. The bipinnate 

 branchiae are somewhat scanty and iri'eg'ular ; they are arranged 

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

 being quite small. There is no labial armature. 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 rows bend 

 downwards near the rhachis, the ten or twelve innermost teeth 

 being smaller and more crowded than the others. All ai-e 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. There is no trace of any 

 armature in the genital apparatus ; the organs are small and 

 possibly even the largest specimen is immature. 



This form pi'esents resemblances to Stait,rodoris, some species of 

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

 and none are present round the pockets of the branchife or i-hino- 

 phores, both of which openings are differently formed from those 

 of Staitrodoris. 



17. Kentrodoris rubescexs B, (Plate XXXIY. fig. 7.) 

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



Several specimens were obtained at Chuaka in August 1901. 

 The distribvition was apparently veiy local and the species was 

 found only on this one occasion. The alcoholic specimens have 

 unfortunately been lost, but I give a figure drawn fi-om the living 

 animal and the following notes : — 



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

 almost gelatinous. Its most I'emarkable feature was the great size 

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

 tile into a large 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. The 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 laterally. 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 number of yellow parasitic 

 Copepoda. 



I think this animal is Bergh 's Kentrodoris nohescens, though, as 

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

 The huge erect gills are even a more prominent featui-e here than 

 in Semper's figure {loe. cit. pi. xxxiii. fig. 8). 



18, Platydoris eurychlamys B, 



[Bergh, S. R. xii. p. 510, Suppl,-Heft i. p. 61, xvi, p. 802.] 

 Two specimens from Ohuaka. 



According to notes made from the living animal, the texture 

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



