1. 
   Semaeostomeae
   (from the article `cnidarian`) ...scyphistoma stage with external chitinous skeleton. Oceanic, some species living at great depths.Order RhizostomaeMedusae like those of ... ...After the planula larva leaves its parent, it settles, passing briefly through a so-called hydratuba stage until it grows i...
   Found op http://www.britannica.com/eb/a-z/s/62
   
   
2. 
   Semaeostomeae
   Semaeostomeae (literally "flag mouth") is an order of large jellyfish characterized by four long, frilly oral arms flanking their quadrate mouths. The umbrella is domed with scalloped margins, and the gastrovascular system consists of four unbranched pouches radiating outwards from the central stom...
   Found op http://en.wikipedia.org/wiki/Semaeostomeae
   
   

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