Ix THE SEA 355 
lures. The “Sea-devil” or “Angler” of 
our coasts has on its head three long, very 
flexible, reddish filaments, while all round its 
head are fringed appendages, closely resem- 
bling fronds of sea-weed. The fish conceals 
itself at the bottom, in the sand or among 
sea-weed, and dangles the long filaments in 
front of its mouth. Little fishes, taking these 
filaments for worms, unsuspectingly approach, 
and thus fall victims. 
Several species of the same family live at 
great depths, and have very similar habits. 
A mere red filament would be invisible in the 
dark and therefore useless. They have, how- 
ever, developed a luminous organ, a living 
“olow-lamp,” at the end of the filament, 
which doubtless proves a very effective lure. 
In the great depths, however, fish are com- 
paratively rare. Nor are Molluscs much more 
abundant. Sea-urchins, Sea Slugs, and Star- 
fish are more numerous, and on one occasion 
20,000 specimens of an Echinus were brought 
up at a single haul. True corals are rare, nor 
are Hydrozoa frequent, though a gaint species, 
allied to the little Hydra of our ponds but 
