National Geographic : 1956 Feb
© National Geographic Society 175 As Daylight Wanes, Anemones Draw In Tentacles and Lock Up Their Fleshy Houses Sea anemones live in all the oceans, from shallows down to the deepest trenches. Some species reach two feet in width. This group lay in 30 feet of water, just under Calypso's stern off Assumption Island. The author observed that as afternoon wore on the anemones pulled tentacles progressively farther into their gullets. Their color varied with individuals, possibly also with the time of day. - Page 174, upper: Tentacles begin to recede, and body columns become visible. A pair of orange-colored anemonefish still find shelter in their lethal den. Lower: Two anemones, having puckered their drawstring muscles, assume the shape of fat tomatoes. Above: At day's end the colony is shut tight, and the two small fish are locked out on the doorstep. Black Damselfish (Dascyllus trimaculatus), marked with white spots, hover round, but do not approach the tentacles too closely (top center).