CALDER, D.R. Some hydroids (Cniadaria : Hydrozoa) from the Mid-Atlantic Ridge, in the North Atlantic Ocean / D.R. Calder & W. Vevoort. -- Leiden : Nationaal Naturhistorich Museum, 1998 - 65 p. -- (Zoologische Verhandelingen, ISSN 0024-1652 ; 319). ISBN 90-73239-64-8 Subjects--Topical Terms: CnidariaHidrozoos Universal Decimal Class. No.: 593.7