Helmet Jelly - Periphylla periphylla
The umbrella is usually higher than wide. It may reach a height of 35 cm and a diameter of 25cm. The tip is pointed or dome-shaped. The large, red or orange stomach occupies the upper part of the umbrella. The 12 thick, orange tentacles can be more than 50 cm long.
This is a common deep sea species. At locations dominated by strong tidal currents, forcing water from 200 metres or more up towards the surface, they can be encountered at any depth.
The helmet jelly is a cosmopolitan and widespread in the Atlantic Ocean, except in the Arctic. The Trondheim Fjord seems to be north of the "official" distribution area, but the helmet jelly does not know that.
Source:
http://www.seawater.no/fauna/cnidaria/periphylla.html
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