65 
among which they swim, simply amazing in its perfectness, must 
undoubtedly afford an excellent protection against sea-birds, and 
I should think it would be equally difficult for any enemy (fish, 
sea-snake or anything else) to find them out from below. 
It is particularly noticeable that it is not one species alone that 
has adopted this habit of swimming and floating among the wooden 
Fig. 3. Young fishes and wooden tragments. Natural size. (The 
frue in so far as there are too few wooden fragments and too many fishes; as a rul 
the wcoden fragments would be a good deal more numerous than the fishes; but I 
have neglected to preserve more than a few of them.) 
figure is not quite 
fi e 
fragments. I have found several species to do this, belonging to 
widely different genera. By far the most numerous of them are 
Serranids, and these are the most perfectly disguised. Monacanthids 
and a species of Tetrodon are also among them. 
Also the young Aulostoma must be included in this type of 
protective resemblance; not that it looks. exactly like the wooden 
fragments, but it looks like pieces of old, withered straw, which 
are found in the same way among the wooden fragments. — Further 
the young Dactylopterus has some resemblance to the wooden 
fragments, but this is not so perfect as in the case mentioned above. 
Vidensk, Meddel. fra Dansk naturh. Foren. Bd. 69. z 
