from The Century Dictionary.

  • noun A class of elongated wormlike marine animals having a ciliated ectoderm, as in the Turbellaria, and an eversible proboscis lying in a sheath on the dorsal side of the enteron. They have a mouth and an anus, simple gonads, and a vascular system; and are, as a rule, diœcious. There is no external segmentation as in the more highly organized class of Chætopoda.


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