Dwellers of the sea and shore . dwellersofseasho00crow Year: 1935 i8o Dwellers of the Sea and Shore Hydractinia. They form a soft mosslike covering, usually of a whitish or pinkish color—the lighter-hued colonies being male, and the darker-hued, female—and are very seldom found growing elsewhere than on the shells of hermit crabs. Here, then, we find that re- hydractinia; a colony of tubularian iiydroids. (photograph made of the living animals growing on a shell occupied by a hermit crab; greatly enlarged.) markable instance known as commensalism, a term which, freely defined, means 'dinin
Dwellers of the sea and shore . dwellersofseasho00crow Year: 1935 i8o Dwellers of the Sea and Shore Hydractinia. They form a soft mosslike covering, usually of a whitish or pinkish color—the lighter-hued colonies being male, and the darker-hued, female—and are very seldom found growing elsewhere than on the shells of hermit crabs. Here, then, we find that re- hydractinia; a colony of tubularian iiydroids. (photograph made of the living animals growing on a shell occupied by a hermit crab; greatly enlarged.) markable instance known as commensalism, a term which, freely defined, means 'dining at the same table.' But in this case, as indeed is the case with most true commensal animals, they do more than merely dine together; they really render each other a service. That is to say, this sort of association is formed for mutual benefit. The tubularians, beside the concealment they
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