Abstract
Species of the interstitial hydrozoan Halammohydra Remane from the west coast of Norway and from Heligoland have been studied morphologically. Of five species encountered two are described as new to science. H. intermedia sp. n. is described from the Bergen area, Norway, where it inhabits the medium to coarse shell gravel. It becomes 1 mm long and stands near H. octopodides and H. schulzei. H. coronata sp. n. is described from Heligoland, where it occurs in two forms, the one inhabiting fine and the other coarse sand. It is closely related to H. adherens. The number of statocysts and anterior tentacles is reduced, while there is a supernumerary number of posterior tentacles.

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