The brown box crab, Lopholithodes foraminatus, is a king crab that lives from Kodiak Island, Alaska to San Diego, California. at depths of 0–547 metres (0–1,795 ft). It reaches a carapace length of 150 millimetres (5.9 in), and feeds on bivalves and detritus. It often lies buried in the sediment, and two foramens in the chelipeds allow water in to the gill chamber for respiration. The gill chamber is also sometimes used by the commensal fish Careproctus to hold its eggs.