Nudibranchiate Mollusca in the China Sea. 91 
know not; but this I do know, that it has not been for want 
of diligent search, made day after day under a tropical sun, 
the result of which was that I have counted one a prize, the 
more valued from its infrequency. 
The first time I had an opportunity of ransacking a new 
shore was at Aden, where I procured three specimens of what 
is most probably the Bornella digitata of Adams, a very beau- 
tiful species, which Mr. Adams discovered in the Straits of 
Sunda, when voyaging in the ‘Samarang.’ It also occurs 
among the Madras Nudibranchs collected by Sir Walter Elhot, 
and described in the ‘ Zoological Transactions’ by Messrs. Alder 
and Hancock. On both these, the only other occasions on 
which they have been met with, two or three specimens only 
were found. Thus we have this little animal extending from 
side to side of the Indian Ocean, and occurring also at an 
intermediate station, on the Coromandel coast. 
On some rocks in the middle of Hongkong Harbour I 
searched in vain, although I had been informed that some 
species were to be found there; and my informant having 
conducted me to the spot, we were both equally unsuccessful. 
Almost the next place which I had any opportunity of exa- 
mining was the basaltic rocks of Makung Harbour, in the 
Island of Ponghou, Pescadores archipelago. These shores 
were remarkably barren of most classes of marine animals ; 
but I was here fortunate enough to meet with a specimen of 
an extremely richly coloured species.of Doris, which Mr. Han- 
cock tells me he believes to be like the Doris Barnardii of 
Kelaart, a MS. species which he met with on the shores of 
Ceylon. This species, probably a species of Chromodoris (A. 
& H.), is marked with deep-blue and yellow spots upon a 
light-blue ground, the tentacles and branchie being of a bright 
vermilion. It is a question at present whether this species be 
_ really the Ceylon species of Kelaart; but it is certain that I 
_ afterwards met with the same species on two occasions upon 
_ the shores of Labuan, separated from the first locality by the 
whole extent of the China Sea, or about 20° of latitude. A 
__-very minute species, of a scarlet colour, measuring only one- 
eighth of an inch in length, I found also in Makung Harbour ; 
___ but its minuteness did not prevent me from meeting with it 
again afterwards upon the coast of China, about 150 miles 
further north. 
____ In Formosa, Kelung Harbour (on the north-east side) was 
the only place I was able to examine; and here the result of 
numerous searches among the sandstone and coral rocks was 
but three (new) species—one a small blue Dor?s, but the other 
two of greater interest. Both of them were remarkably beau- 
