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Wall of the stomach in order to get into the body cavity. I have 
tried to find the hole in the oesophagus or stomach through which 
the fish must be supposed to have entered, but the faet that the 
wall of the stomach is exceedingly thin and delicate makes it doubtful 
whether the holes actually observed were not accidentally caused 
by the cutting open of the starfish, which — on account of the 
very thick leathery skin — cannot be done in a very gentie way. 
The fish must, of course, leave its host for the sake of propagation; 
but this is again for future observations. I would only point out 
ihat all the specimens found were apparently nearly or quite full- 
grown (ca. 10 — 15 cm long); only in the single case, where two 
specimens were found together in one starfish, one was only about 
half as big as the other. Young specimens were never met with. 
It may further be pointed out that the facts that the fish is fairly 
strongly pigmented, and that its eyes are apparently quite normally 
developed, not showing any trace of being more or less rudimentary, 
as might be expected from its living in complete darkness, would 
seem to indicate that the fish does leave its host at times. A detailed 
study of all the questions connected with this most interesting case 
of parasitism — it could hardly be termed symbiosis — could not 
fail to be of more than ordinary interest. 
Besides the thick and clumsy, light pink-coloured Choriasters, and 
the huge, grayish-yellow Linckia's (L. Guildingii Cray), with the thick, 
stiff arms up to 28 cm long, also Echinaster luzonicus was fairly com- 
mon, generally carrying the same sort of Coeloplaria as was found so 
very commonly at the Kei-lslands. Very large Holothurians were 
brought up in considerable numbers, among which one named “Tre- 
pang koeda” (horse-cueumber) was almost meterlong; the “Trepang 
soesoe” (Miilleria maculaia Brandt, according to literature; I have 
not myself verified the Identification), estimated as the most delicious 
of the eatable sorts, was found to cover itself with small pieces of 
algæ; nearly constantly a small crab, evidently commensal, was found 
among its tentacles (probably Lissocarcinus orbicularis Dana, known to 
live in this way in various Holothurians of the Indian Ocean). Coma- 
tulids were numerous, as already found by the “Challenger”, while 
Ophiurids and Echinoids were very rarely found by the diver and 
evidently very scarce. 
Among the Gorgonians mention should be made especially of a 
