
Halichondria is a genus of marine demosponges belonging to the family Halichondriidae. These are massive, amorphous sponges with clearly separated inner and outer skeletons consisting of bundles of spicules arranged in a seemingly random pattern. This genus of sponges became important through the discovery of cell division limiting properties of t...
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http://en.wikipedia.org/wiki/Halichondria

The Halichondria is a family of sponges of the Demospongia class. They comprise the common sponges of the British coasts. They are found incrusting stones and sea-weed below the tide-mark, and have often elegant forms, but are unfit for any use. One species, Halicondria oculata, is popularly known as the 'mermaid's glove'.
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http://www.probertencyclopaedia.com/browse/BH.HTM
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