1) Apolemia 2) Jellyfish 3) Nanomia 4) Praya 1) Hydroid 2) Hydrozoan 
• (n.) One of the Siphonophora.
Si·phon'o·phore noun (Zoology) One of the Siphonophora. 
[n] - a floating or swimming oceanic colony of polyps often transparent or showily colored
siphonophore Any of various transparent, often subtly colored marine hydrozoans of the order Siphonophora, consisting of a floating or swimming colony of polyplike and medusalike individuals and including the Portuguese man-of-war.
noun a floating or swimming oceanic colony of polyps often transparent or showily colored