92 Dr. C. Collingwood on the Distribution of Species of 



tiful species ; but one of them possesses especial interest as 

 probably representing a new genus of swimming Nudibranclis, 

 its natation being performed by a vertical or up-and-down 

 motion, and not, like that of BorneUa, by a lateral, vermicular 

 movement. I met with neither of these species, nor the next 

 to be mentioned, on any other occasion. 



When dredging about 170 miles to the north-east of For- 

 mosa, in 60 fathoms water, amidst a mass of delicate branch- 

 ing corals &c., I obtained a glorious new species of Chromo- 

 don's, translucent, of a rich amethystine tint, with yellow ten- 

 tacles and branchiffi. And I may be permitted to mention 

 that at the same time and place I obtained large specimens of 

 OrhitoUtes and a GydocJypeus^ only inferior in size to those 

 dredged by Sir E. Belcher on the coast of Borneo, my speci- 

 men being one inch and three-quarters in diameter. 



On a small island in Haitan Straits, on the coast of China, 

 I met with five species. One of these I have already alluded 

 to as having also occurred in the Pescadores. Of the remaining 

 four, found upon a promising stony beach at spring tide, one 

 was a large velvety-brown Doridopsis, the second a small 

 Eiqylocamtis, or, perhaps, Plocamojdwrus, and the other two 

 were richly coloured species of Chromodoris. Of these, one, 

 studded with round crimson tubercles upon a cream-colom-ed 

 ground edged with chrome, I afterwards found to be not un- 

 common at Labuan, not only on the shores of Labuan itself, 

 but also on two small islands adjacent — another instance of 

 rather more than twenty degrees of separation, nearly the 

 whole of the China Sea being between the two localities. 



On a submerged coral-reef, nearly in the centre of the China 

 Sea, I found two species : one was probably a new species of 

 Chromodoris^ and the other a variety of the Doris exanthemata 

 of Kelaart, described by him in the ' Annals ' for 1859, among 

 the Ceylon Nudibranchs. The specimen I obtained upon this 

 reef was small, about 3 inches long, and by no means an 

 ugly object ; but .upon a small coral-island on the west coast 

 of Borneo, 7^ degrees south of the reef, I again met with 

 this species — this time, however, much larger specimens, 

 nearly 7 inches long and 4i wide, which were truly wretched- 

 looking objects for Nudibranchs, and much more like the 

 " loathsome diseased mass " described by Kelaart. 



When I was at Labuan, on showing some of my drawings 

 of the above Nudibranchs to a gentleman wlio had indulged 

 in shell-collecting on the reefs, I was assured that many beau- 

 tiful species of the family were to be found there ; and I there- 

 fore was greatly in hopes of adding largely to my collection 

 at this place. The first species which occurred to me was. 



