In Plate IX. a very beautifully distinct form of this singular race of animals is very carefully delineated—_Actinia anguicoma_—which seems to be shaking loose a mass of serpent-like hair, like another Medusa; from which appearance, its specific name _anguicoma_, signifying snake-haired, has doubtless been given. The tentacles of the _Actinia mesembrianthemum_ are generally of a beautiful rosy-pink, and the body of a rich warm brown. But of all the species, _A. crassicornis_—represented in the lower part of Plate X.—is perhaps the handsomest, the orifice or mouth being of a delicate straw tone, the tentacles white, variegated with bands of delicate pink, and the body, or stem, a rich orange-brown, thickly sprinkled with tubercles of bright yellow. This fine species sometimes measures five inches across, when the tentacles are fully expanded. When the _Actiniæ_ are in a state of repose or sleep, the tentacles are entirely drawn in, and the stem or body closes over the orifice, leaving only a slight indent to mark its existence. In this state they might be mistaken for short-stemmed fungi, the pale-bodied species being very much like a half-grown mushroom, if one can imagine it placed close to the ground, without any visible stem. Most of the species can be easily detached from the rocks to which they are found adhering, but in some cases it is found necessary to cut out the portion to which they cling, by means of a hammer and chisel. But when this is done, and they are placed in the Aquarium, they often willingly leave the stone to which they are attached, which they would not do by gentle persuasion, or any moderate amount of force; and they then take up their station on some suitable portion of the artificial rock-work, just as those do that have been originally detached from their native rocks. Above twenty species of _Actiniæ_ are known to British naturalists. [Illustration: PLATE IX. 1. Actinia anguicoma. 2. Cucumis hyalinus. 3. Echinus sphæra. 4. Alyconium digitatum.] The _Lucernariæ_ are another class of Zoöphytes, or plant-like creatures, as the term _Zoöphyte_ implies, being formed of the Greek word, _Zoön_ (ξωον), signifying a thing possessed of animal life, and _phyton_ (φυτον) a plant. This general term is applied to all the creatures—some of very distinct character—that belong to this class, which forms a separate division of natural science, known as Zoöphytology.