Abstract
Three new genera and a new family of umbonuloid-walled Bryozoa are described: Brendella (Arachnopusiidae), Hellerasca (Exochellidae), Dhondtiscus (Dhondtiscidae). Subconical Brendella and Dhondtiscus (New Zealand) and erect Hellerasca (South Atlantic) all occur on soft deep-sea sediments, a mode of life otherwise not well known for umbonuloid Bryozoa. Another deep-water genus, Buchneria (Japan), hitherto considered to be a cryptocystidean ascophoran with a compensation sac, has been discovered to have an umbonuloid frontal shield. Buchneria is considered monotypic and to belong to the Celleporariidae. An interim classification of known umbonulomorph genera is given.

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