Nudihranchiate 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 Elliot, 

 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. Tlius 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 Boris Barnardii of 

 Kelaart, a MS. species which he met Avith on the shores of 

 Ceylon. This species, probably a species of Ckromodoris (A. 

 & H.), is marked Avith deep-blue and yellow spots ujjon a 

 light-blue ground, the tentacles and branchiae being of a bright 

 vermilion. It is a question at present whether this species be 

 really the Ceylon species of Kelaart 5 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) Avas 

 the only place I Avas able to examine ; and here the result of 

 numerous searches among the sandstone and coral rocks Avas 

 but three (ncAv) species — one a small blue Doris, but the other 

 Both of them AA^ere remarkably beau- 



