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The colonies vary from two to six inches in height, and grow in a branched, fan-like pattern. The terminal hydranths are large, with vermilion bodies and white tentacles. The hypostome is long and is covered with stubby, knobbed tentacles. In addition, there is a basal ring of about 12 long, slender tentacles. Diagrams are given by Hyman (1940) and Nutting (1901). The adult colonies are very common at Woods Hole, Mass., and can be collected from Fucus or other sea-weeds, or from pilings three feet below sea level. They are abundant on the vegetation of the Spindle.