. 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 w^e 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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Keywords: ., bookauthorschmidtd, bookcentury1800, bookdecade1890, bookyear1896