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These animals are relatively abundant at Woods Hole, Mass. They may be obtained during the day from the bottom or vegetation of Eel Pond, or during the evening, between 7:30 and 9:30, when the mature worms are swarming at the surface. They are attracted by the light of the Nereis-collecting lamps. The sexes are separate, and when the animals are ripe, they may be distinguished by the color of the gametes seen through the semi-transparent body wall; the females are seal-brown, the males cream color.