humble bath sponge (Spongia officinalis and a few relatives) is a
drab, inert and lifeless object that gives little hint of the colour and
diversity found among the 10,000 living sponges.
Although their life functions at a cellular level, with no evidence of a nervous sytem, sponges are well co-ordinated, as can be seen from the beautifully symmetrical forms of some of the deeper-water species.
The one shown here is the bleached skeleton of the Venus' flower basket (Euplectella aspergillum) belonging to the small group of glass sponges (Hexactinellida). They are characterised by a skeleton composed microscopic, six armed silica spicules.
The species was described, and named, in 1841 by the great anatomist Richard Owen, first Director of the British Museum Natural History.
The exquisite white skeleton of these sponges was much admired by the Victorians and a pair to be mounted under a glass dome, could fetch 5 guineas.
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