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The colonies of this form are tan or grey in color, and are composed of numerous pin-like individuals crowded together; the colonies are approximately one-half inch in height, and from one-half to one inch in extent. They are often found in association with Venus shells which are encrusted with the sponge, Cliona (Rogick, 1948), and are obtained by dredging in the Hole at Woods Hole, Mass. Barentsia is very similar to Pedicellina, but is larger, hardier, and easier to find.
Rogick ( 1948) reports that free-swimming larvae and embryos in various stages of development were obtained between July and September, but that very probably they are also obtainable earlier and later during the summer. It is not certain whether Barentsia is sometimes hermaphroditic (Rogick, 1948), but in many instances, at least, the sexes are separate.