Maxwellia gemma Sowerby, 1879 42-47mm La Jolla, California In cracks in reef at 50-70' at night
Maxwellia gemma Sowerby, 1879 37mm Palos Verdes, CA In cracks of large boulders at 30-40'
Maxwellia santarosana Dall, 1905 43-44mm Rock Quarry, Catalina Island, California at 100' on rocks at night. This species is usually heavily encrusted, these required no cleaning at all.
Pteropurpura vokesae Emerson, 1964 46mm Mission Bay Jetty, San Diego, CA on mossy rock at base of pilings at 30'