It has an endoskeleton of calcified ossicles and is covered in a fleshy layer of skin giving it a rubbery appearance.

It also occurs in the Pacific Ocean from the Bering Sea south to Japan and Laguna Beach, California.

[6] It feeds by perching in an elevated position and extending its arms in a net-like fashion perpendicular to the current.

[6] It ensnares small crustaceans such as the northern krill (Meganyctiphanes norvegica), copepods, chaetognaths, jellyfish, and detritus that come within reach.

[4] In Puget Sound, juveniles have been found to be living and apparently feeding inside the pharynges of Gersemia rubiformis polyps, only emerging when sufficiently grown to fend for themselves.