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The larvae are free-swimming and have the pelvic fins elongated into filaments. The British species is found all round the coasts of Europe and western North America, but becomes scarce beyond 60° N. lat.; it occurs also on the coasts of the Cape of Good Hope.
Few of the higher animals live parasitic lives. In its early stages this creature is free-swimming and looks not unlike other young crabs. But it soon attaches itself to another crab and begins to live at the expense of its host.
These fish are divided into the haunters of the shore, the free-swimming forms, the cartilaginous fishes or Selachii, which are not so named but are placed together, the mud-loving forms, and the fresh-water fish. Finally come invertebrates arranged in some sort of order according to their structure.
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