Sponges are frequently found on the lower shore in gullies and under rocky overhangs. Here they avoid desiccation and display a range of colours and growth forms giving them a superficial resemblance to plants. Indeed, it was not until the 18th century that they were classified as animals and as late as 1825 before the issue was put beyond doubt by the research of Dr R.E. Grant of Edinburgh.
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J. D. Fish
- Springer Netherlands