162 THE OCEAN WORLD. 
navigate Lake Thau meet,” says Frédol, “at certain periods of the 
year with numerous colonies of a species about the size of a small 
melon, nearly transparent, whitish like water when it is mixed with 
Fig. 54.—Chrysaora Gaudichaudi, 
an extract of aniseed. One would be tempted to take these animals 
at first for a collection of floating muslin bonnets,” 
The Medusz are furnished with a mouth placed habitually in the 
middle of a nectocalyx or of an umbrella. This mouth is rarely 
unoccupied. Small molluscs, young crustaceans, and annelids, form 
their ordinary food. In spite of their soft substance, they are most 
