Flatworms do not have any circulatory system, respiratory gills, or an anus. Respiration and food transport occurs by the means of diffusion. This is one of the main reason that they are so flat.
Box Jellyfish, a jellyfish found in Northern Australia waters, has tentacles that each contain up to 750,000 nematocysts. The tentacles are raised and lowered allowing 'fishing' at various depths.
