Soft body is protected by a parchment-like tube, secreted by the anemone, which emerges from the sand.
Tentacles can be white, black, brown or orange.
Tube is brown to black. Alaska to Baja California. Small fishes, small crustaceans and zooplankton. Prey for the nudibranch, Dendronotus iris. Eggs can be fertilized within the animal or in the open water.