You have a species of Beroida (no introduced species in Nordic waters at the present time)
With tentacles absent; no lobes; network of ducts in body wall.
You may use data, pictures,information etc. available ad the site, as long as you refere to the sourse.
The database as a whole is to be cited as follows:
NOBANIS. Available from http://www.NOBANIS.org. Data of access x/x/201x