Abstract
The development of the hydroid of Amphinema dinema (Peron & Lesueur) has been followed in the laboratory until the production of young medusae and the hydroid identified as Perigonimus serpens Allman.The hydroid of Amphinema rugosum (Mayer) is described for the first time. It is very similar to P. serpens but more robust.The hydroid has been reared from Rathkea octopunctata (Sars); it is very minute and the hydranths possess a single whorl of long filiform tentacles/A small Cuspidella hydroid was reared from Mitrocomella brownei (Kramp).Certain points in the synonymy of these species are discussed. An account of the methods of rearing used is also given.

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