Rees, W.J. (1956). On three northern species of Hydractinia. Bull. Br. Mus. Nat. Hist., Zool. 3 8: 351-362. Bulletin of the British Museum (Natural History). 3: 351-362.
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Rees, W.J.
1956
On three northern species of Hydractinia. Bull. Br. Mus. Nat. Hist., Zool. 3 8: 351-362.