When Professor Louis Agassiz had discovered that Millepora was a Hydroid, and not an Anthozoan, he concluded from the fact that Pocillopora and Seriatopora were provided like it with tabulæ, that these genera also were to be assigned to the Hydroida. Quoy and Gaimard had, however, figured the twelve tentacles of Pocillopora; Verrill examined the coral in 1872, and showed that it was clearly Madreporarian ; and I subsequently also examined its structure myself. Although from the close resemblance of the corallum of Seriatopora to that of Pocil-lopora it seemed almost certain that the former was also Madreporarian, the fact has never hitherto been proved, nothing as yet, as far as I know, having been published concerning the structure of the soft tissues of this genus. I have, therefore, been on the watch for specimens of Seriatopora preserved in spirits, and have just found an excellent specimen of S. subulata...

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