NEMERTINA, or Nemerteans (Nemertea), a subdivision of worms,' characterized by the ciliation of the skin, the presence of a retractile proboscis, the simple arrangement of the generative apparatus, and in certain cases by a peculiar pelagic larval stage to which the name " pilidium " has been given.
Archiv fiir Zoologie, ii.; Id., " The Genera of European Nemerteans critically revised," Notes from the Leyden Museum (1879); Id., " Zur Anatomie u.
Nemerteans (Ray Society, 1873-1874); A.
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