Page:The ocean and its wonders.djvu/212



EFERENCE has elsewhere been made in this volume to the immense amount of animal life that exists in the ocean, not only in the form of fish of all sizes, but in that of animalcules, which, although scarcely visible to the naked eye, are, in some cases, so innumerable as to give a distinct colouring to the water.

The Medusæ, or, more familiarly, sea blubbers, are seen in the waters that lave our own shores. They are of various sizes, from that of a large plate to a pin-head. They are almost colourless, like clear jelly, and when carelessly observed, seem to be dead objects drifting with the tide; but a closer observation shows that they are possessed of life, though not of a particularly active kind, and that they swim by alternate contractions and expansions of their bodies. These creatures constitute a large part of the whale's food. Some of them are flat, some semi-globular, others are bell-shaped, while