It is
now known that the young jelly-fish passes through a series of
transformations before reaching its perfect state.
At certain seasons, eggs are produced within the body of the parent in
appropriate ovaries, where they are retained for a time. They are then
transferred to a kind of marsupial pouch, analogous to that of the
kangaroo, where their development proceeds. After passing through
certain changes here, the egg issues from the maternal pouch as an
oval body, clothed with cilia--an animalcule in external aspect, and
as unlike its parent as can well be imagined. For awhile the little
creature dances freely through the water, and leads a gay, roving
life; but at last it prepares to 'settle;' selects a fitting locality;
applies one extremity of its body to the surface of stone or weed, and
becomes attached. And now another change passes over it. The cilia, no
longer needed, disappear. A mouth is developed at the upper extremity
of the body, furnished with a number of arms. Gradually this number
increases, and the jelly-fish now appears in the disguise of a polype,
which feeds voraciously on the members of the class from which it has
itself so lately emerged.
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