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Trachina:-

These worms are much more dreaded than
the tape worms and are the cause of a very
painful disease. They burrow through the walls
of the intestines into the muscles.

Angle Worms:- (Fish worms)

Angle worms feed on particles of soil, eating
as they tunnel though it. The particle of soil
is swallowed and any decayed animal matter
on it is digested, the remainder in (is) then thrown
back up, and can often be seen around the top of
the worm hole. In winter they hibernate below
the frost line.

Angle worms or Earth worms reproduce by eggs.
The girdle or clitetlum (clitellum), contains the eggs; it moves
forward till it covers the segment contain the sperms,
the eggs are fertilized; the clitellum moves off over
the head; the eggs are then let out and are hatched
by the warmth from the sun.

Leeches:-

Leeches live in fresh water ponds and streams.
They live on blood, which they suck from cattle and
various other animals. Formerly they were used
to quite an extent for medical purpose , being
applied to a patient to extract quantities of blood.