NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Hydnoceras tuberosum, glass sponge fossil. Glass sponges are also known as hexactinellid sponges. They are a form of sponge, with a silaceous skeleton. This vase-shaped specimen dates from the Devonian of New York, USA. It is part of the collections held at the Natural History Museum, London, UK.
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