from The Century Dictionary.

  • noun The only genus of fresh-water sponges, belonging to the group Fibrospongiæ.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Zoöl.) A genus of siliceous sponges found in fresh water.


Sorry, no etymologies found.


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  • Both chemical and histological observations showed the abundant presence of starch in the green cells, and thus these planarians, and presumably also _Hydra spongilla_, etc., were proved to be truly "vegetating animals."

    Scientific American Supplement, No. 324, March 18, 1882


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