(M. Sars, 1846)
Description
Umbrella bell-shaped, about as high as wide [Bougainvillia muscoides ]. Scattered nematocysts and four perradial longitudinal furrows on exumbrella. Four radial canals. Jelly not very thick; velum very broad.
Gastric peduncle may be indicated; manubrium fairly small, cone-shaped with a quadrangular base. Mouth with four oral tentacles inserted above mouth opening, dichotomously branched 4-5 times, ending in nematocysts containing small knobs; basal trunk of tentacles short but distinct.
Gonads situated interradially on manubrium, well separated in the perradii.
Four large globular marginal tentacular bulbs each with a group of 5-7 tentacles of one kind. Without ocelli.
Development: B.muscoides.
Size
Umbrella 4-5 mm high and wide.
Colour
Young specimens with manubrium and marginal bulbs yellowish-brown to orange [see Margelis nordgaardi, synonym of B. muscoides ].
Distribution in the North Sea
Southern and northern North Sea.
World distribution
NE Atlantic Ocean.
[After Russell, 1953a; Russell, 1953b; Kramp, 1959]