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Ralph, P. M. (1956). Variations in Obelia geniculata (Linnaeus, 1758) and Silicularia bilabiata (Coughtrey, 1875) (Hydroida, F. Campanulariidae). Transactions of the Royal Society of New Zealand. 84: 279-296.
Ralph, P. M. (1956). Variations in Obelia geniculata (Linnaeus, 1758) and Silicularia bilabiata (Coughtrey, 1875) (Hydroida, F. Campanulariidae). Transactions of the Royal Society of New Zealand. 84: 279-296.