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1. On the Representative Relationships of the Fixed and Free Tunicata, regarded as two sub-classes of equivalent value; with some general remarks on their morphology

  • John Denis Macdonald

Extract

In this paper the author maintains the proposition, that the class Tunicata may be conveniently divided into two sub-classes, viz., the Fixed or Stationary, and the Free or Locomotive, of at least nearly equal value in a zoological point of view, in opposition to the opinion commonly entertained, that the so-called Pelagic Tunicata compose a group only commensurate with the groups of the Compound, the Social and the Simple, into which the Fixed Tunicata have been divided by Milne-Edwards and others.

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