purple sail:

More on purple sail from Fact Monster:

• jellyfish - jellyfish jellyfish, common name for the free-swimming stage (see polyp and medusa), of certain ...
• polyp and medusa - polyp and medusa polyp and medusa, names for the two body forms, one nonmotile and one typically ...
• polyp and medusa: Colonial Species - Colonial Species In many species the polyp, or hydroid, stage is colonial: as new polyps are ...
• Encyclopedia: Zoology: Invertebrates - Encyclopeadia articles concerning Zoology: Invertebrates.

See more Encyclopedia articles on: Zoology: Invertebrates