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Published online by Cambridge University Press: 17 January 2013
From all the facts which the study of the Hydroida has made apparent, we may regard it as certain that however long zooidal multiplication may continue, this is not sufficient for the perpetuation of the species, but that a period must at last come in the life of the hydroid when by an act of true sexual reproduction, new individuals are produced for the indefinite extension of the species through time.
page 100 note * The bifurcation occasionally observed in the spiral hydranth of Hydractinia is evidently abnormal, and cannot be regarded as invalidating the above statement.
page 101 note * The mere number of zooids in two or more of these groups may of course vary, depending as this does on the accident of abundant or deficient nutrition and the like.