Browne, 1903
Description
Umbrella ovoid, with thick walls. Four radial canals and ring canal, apical canal absent. Manubrium large, conical, with a broad, flat, quadrangular base [M.hartlaubi-drawing ]. Mouth circular, simple. Gonads completely surrounding manubrium. Four small marginal tentacle bulbs, without ocelli, each with 2 (or 3) tentacles with rings of nematocysts.
Habitus: M.hartlaubi-orig
Size
Umbrella 2-4 mm high and wide.
Distribution in the North Sea
Found off the Norwegian coast (Herlöfjord, Herdlafjord).
World distribution
Norwegian waters.
Remark
Polypoid stage unknown.
[After Russell, 1950a; Kramp, 1959]