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Updated: June 11, 2025
Another remarkable feature among the Madrepores consists in the prominence of one of the Polyps on the summit of the branches, showing a kind of subordination of the whole community to these larger individuals, and thus sustaining the view expressed above, that the combination of many individuals into a connected community is among Polyps a character of superiority when contrasted with the isolation of the Actiniae;. In the Sea-Fans, the Halcyonoids, as they are called in our classification, the number of tentacles is always eight, four of which are already present at the time of their birth, arranged in pairs, while the other four are added later.
This is fastened to the stern of a boat under sail, and thus the bottom is raked of all sorts of objects; among which, on emptying the net, many living creatures for the aquarium are found. These may be placed temporarily in jars; though plants, mollusks, Crustacea and Actiniae may be kept and transmitted long distances packed in layers of moist sea-weed.
The lowest in structure among the Polyps are not Corals, but the single, soft-bodied Actiniae. They have no solid parts, and are independent in their mode of existence, never forming communities, like the higher members of the class. It might at first seem strange that independence, considered a sign of superiority in the higher animals, should here be looked upon as a mark of inferiority.
With regard to the geological position of the Actiniae we can say nothing, because, if their soft, gelatinous bodies have left any impressions in the rocks, none such have ever been found; but their absence is no proof that they did not exist, since it is exceedingly improbable that animals destitute of any hard parts could be preserved.
The position of the Corals on a Reef accords with these series of structural gradation and geological succession. It is true that we do not find the Actiniae in the Reef any more than in the crust of the earth, for the absence of hard parts in their bodies makes them quite unfit to serve as Reef-Builders.
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