Slipper lobsters have paddle-shaped antennae and are typically found on cavern ceilings during the day.  Large species are no longer common due to heavy fishing pressure and disregard for local laws.  Minimum tail width is 2.75 inches.  Illegal to harvest from May through August, spearing and taking of females with eggs prohibited.

http://hawaii.gov/dlnr/dar/regulated_fish_mia.html

Puako, Hawaii, 15 feet

Typical habit, Kahe Point, Oahu, 35 feet

Larva, Puako, Hawaii

Makapu'u tidepool, Oahu

100 ft. Hole, Waikiki, Oahu, 80 feet

Makai Pier, Waimanalo, Oahu, 10 feet

Mahi Wreck, Oahu, 85 feet

Diamond Head, Oahu

Common on shallow reefs at night.  Clings to the underside of large slabs or ledges by day.  Its eyes appear to glow when lighted.  Margins serrated.  Attains 6 inches.  Worldwide in warm seas.