. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . uals, the sting- ing ones being situated along the front margin of thenear .the Opening shell. (After Weismann.) there is often to be found a sea anemone, or sea rose (Fig. 229). This seaanemone is fastened securely to the shell, and has its mouthopening and tentacles near the head of the crab. The seaanemone is carried from place to place by the hermit crab,and in this way is much aided in obtaining food. On theother hand, the crab is protected from its
. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . uals, the sting- ing ones being situated along the front margin of thenear .the Opening shell. (After Weismann.) there is often to be found a sea anemone, or sea rose (Fig. 229). This seaanemone is fastened securely to the shell, and has its mouthopening and tentacles near the head of the crab. The seaanemone is carried from place to place by the hermit crab,and in this way is much aided in obtaining food. On theother hand, the crab is protected from its enemies by thewell-armed and dangerous tentacles of the sea anemone. Inthe tentacles there are many thousand long, slender stingingthreads, and the fish or octopus that would obtain the her-mit crab for food must first deal with the stinging is no doubt here of the mutual advantage gained bythese twTo widely different but intimately associated com-panions. If the sea anemone be torn away from the shellinhabited by one of these crabs, the crab will wander about,carefully seeking for another anemone. When it finds it, it25. 374 EVOLUTION AND ANIMAL LIFE struggles to loosen it from its rock or from whatever it maybe growing on, and does not rest until it has torn it loose andplaced it on its shell. There are numerous small crabs called pea crabs (Pin-notheres) which live habitually inside the shells of living mussels and the crabs live together in apparent harmon}^and to their mutual benefit. The relations between ants and aphids (plant lice) areoften referred to in popular natural histories and books about .
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