. Fig. 14- animal from which it is derived, but produces gemmules. Only in this generation does the species revert to the sexual form. We shall understand this alternation of generations if we begin with the simplest Medusa polypes. Such a one is the annexed Hydractinea carnea, of which the female individual is portrayed. Compared with the intermediate form, Stauridium, the preliminary phase of the Cladonema, reproducing itself asexually,

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