328. THE WORLD OF THE SEA. 
has a long, lithe tail, which can be wrapped round the stems of the 
algee and the coral, and even by its means many of these singular 
creatures can hold themselves together. Some—like the Gurnard 
—have very broad, thin fins, which look like sails. These extended 
fins are used by some fish to make aérial flights, for there are 
flying fish just as there are swimming birds. These fish rise some 
THE GURNARD. 
(Trigla gurnardus.) 
few feet above the surface of the sea, and some of them can even 
fly a mile; but as soon as their fins become dry they lose their 
flexibility, and the fish falls down into its native element. 
When the flying fish are pursued by a John Dory or a dolphin, 
the poor creatures in their terror leap out of the water, only to 
find an albatross, or some other of their winged enemies hovering 
above to seize them ; dangers surround them on every side, and in 
flying from one they run into another, and with difficulty is it that 
they escape an untimely end. 
The 7rigla lucerna is a flying fish, the interior of whose mouth 
