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Chapter 26 THE TUNICATES, OR ASCIDIANS
Structure of Tunicates.-One of the most singular groups of animals is that known as Ascidians, or Tunicates. It is one of the most clearly marked yet most heterogeneous of all the classes of animals, and in no other are the phenomena of degeneration so clearly shown.
Among them is a great variety of form and habit. Some lie buried in sand; some
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