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SUMMARY

The type material of Boulenger's Moerisia lyonsi has been examined, and the characteristics of the hydroid and its medusa have been compared with those of the lower corymorphines and with other species of the Moerisiidae.

An evaluation of the characters of the family reveal that its affinities lie with the suborder Capitata of the Anthomedusae (Athecata), and its nemato-cyst armature, a tricnidome of stenoteles, desmonemes and atrichous haplonemes, confirms this.

A new superfamily, the Moerisioidea is created within the Capitata to take this family; its affinities he with the more primitive Tubularoidea.