On the shallow rocky and sandy surface of the Mediterranean sea is where the ancient Greeks picked the Bath Sponge (Spongia officinalis) either for medicinal purposes or cleaning. It was thought to cure digestive issues and was even used as an absorbent material in surgeries. This commercial sea sponge can be light gray or black and is usually seen in large lobes with small openings. You can also identify it by its elevated and cone-shaped void. It has no spicules and the upper side has several oscules. Individual bath sponges can be male or female or sequential hermaphrodites.