CORAL-FISHES. 
Their colouring is the chief feature of Coral-fishes, and many striking examples are shown in the coloured plate. 
remarkable fact about this coloration is that in many species it can be quickly changed. Here is an instance: One of the File- 
fishes when taken out of the water was dark greenish-black, scribbled with faint yellow lines, but when it was turned into a~ 
white bucket of sea-water the yellow lines gradually expanded till the whole body was a pale yellow colour minutely speckled 
with black. 
A most 
