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The trophosome of B. superciliaris is about two inches tall, irregularly branched and light green in color. The pale rose hydranths have 15-20 tentacles in a single whorl about an inconspicuous hypostome. B. carolinensis is usually three to six inches tall; it is by far the commoner species at Woods Hole, Mass. The colony is light brown in color, with a greenish tinge; the red hydranths bear about 12 stiff, filiform tentacles on a long, flexible eversible proboscis. Both species- are found attached to Fucus and floating timbers, and B. carolinensis has also been collected from the dock of the U. S. Fish Commission. See the paper by Nutting (1901) for details and diagrams.