Cone snail. Cone snails are also called pig snails, nine-layer snails, screw snails, drill snails. Qingdao people called boo bo snail. The cone snail is a medium gastropod, cone snail family class of organisms, shell small delicate, 30 layers of convex circle of the conch layer, from small to large sequential arrangement. The axes and mouths of the shells are rounded. Distributed in the Philippines, southeastern coast of China, Taiwan, the coast south of Fujian, Indonesia, Malaysia.