The Brain Sponge is a species of sponge that can look like either a real brain, or what looks like narrowing fingers.
It lives primarily on rocky reefs that are about 25 metters.
Apperance[]
The brain sponge may grow to 20 cm across. It has a smooth surface, covered with many scattered oscula. It may be beige to pink in colour and grows in two forms: one massive and convoluted, rather like a brain, and the other with narrowing fingers. Its texture is soft and very compressible.