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 Nudibranchs, 
its natation being performed by a vertical or up-and-down 
motion, and not, like that of Bornella, 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- 
doris, translucent, of a rich amethystine tint, with yellow ten- 
tacles and branchie. And I may be permitted to mention 
that at the same time and place I obtained large specimens of 
Orbitolites and a Cycloclypeus, 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 
Euplocamus, or, perhaps, Plocamophorus, and the other two 
were richly coloured species of Chromodoris. Of these, one, 
studded with round crimson tubercles upon a cream-coloured 
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, 74 degrees south of the reef, I again met with 
this species—this time, however, much larger specimens, 
nearly 7 inches long and 43 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 who had indulged 
in shell-collecting on the reefs, | 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, 
