a hollow, usually inverted vessel, suchas one used for diving deep below the surface of a body of water
a hollow, usually inverted vessel, such as oneused for diving deep below the surface of a body of water
built by the European Argyroneta (water spider) while under water, silk threads are loosely woven together with water plants to trap air bubbles that are brought down by the spider, used as retreat for eating, mating, and egg laying