"We will need to keep a sharp lookout for the Blue Shark, whom you
have already had the pleasure of meeting, and we may catch a glimpse
of the Hammer-headed Shark, a terribly fierce monster with a head
shaped like a hammer.

[Illustration: HAMMERHEADED SHARK A Terribly Fierce Monster is the
Hammerheaded Shark]

"But the enemy that I dread most of all is the Sword-Fish, so named
from the long sword-shaped snout on his upper jaw. This sword is very
strong, and so sharp that it will easily pierce a boat. The White
Shark is bad enough, but the Sword-Fish is even worse. His aim is
unerring, and his disposition so fierce that he will attack anything
that comes in his path, large or small. I saw one once that measured
twenty feet, but that was from a safe distance, for I make it a rule
to give them all a wide berth.

[Illustration: SWORD-FISH The Enemy the Pilot-Fish Dreaded Most of
All]

"Then there is the Saw-Fish, whose long snout has teeth on both sides
like a saw, and his company is not desirable either.

"Fortunately for us the Sea-Wolf prefers the northern ocean, and
fortunate it is for the northern fish that he is a slow swimmer, else
the next census would show a decided decrease in the fish family. The
Sea-Wolf has a tremendous appetite, and his huge jaws, armed each with
six rows of teeth, can easily crush the toughest shell-fish, of which
food he is very fond. They are often to be seen over seven feet long,