This genus has been separated from actinia on account of its habit of throwing out threads when irritated.
The locomotive power of the anemone, or actinia, is very sluggish.
The actinia gemmacia, which is like a gorgeous sunflower, is said to be the most voracious of its kind.
actinia Mesembryanthemum, partially expanded; (a) Ditto, closed.
One of the most common among the many varieties of sea-anemones is the actinia mesembryanthemum.
Each several coral-individual is equivalent to a single living polyp (actinia).
The actinia crassicornis, Asterias glacialis and oculata, are common.
Cut off the tentacles of an actinia, and they are replaced in a short time, and the experiment may be repeated indefinitely.
This actinia differs from those described above, in having two of the sides flattened, instead of being perfectly circular.
actinia mesembryanthemum is the common Smooth Anemone which abounds on every part of our coast.