Elements of zoölogy a Elements of zoölogy : a textbook elementsofzolo00tenn Year: c1875 A living Mollusk—expanded. soon disappear, and only the shell remains. Curious and wonderful as the shells are, they often give only the FIG. 525. faintest idea of the appearance of the animals when alive. The shell is a part of the animal, and not a mere house which it enters and leaves at pleasure ; although the so-called animal readily expands Mollusk dead-or contracted. much beond the ]imitg Qf thig

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