bend round and unite; and the mouth, which at first is on one side, being a portion of the old one, comes to the centre of the disc, and in addition to the few old tentacles that remain, new ones are added, with their interior chambers, till they amount to five rows, and in this manner a brood of young Caryophylliæ is formed. [Illustration: Fig. 130. Lobophylla angulosa.] During the second year of their soft state, these madrepores increase by budding. The buds spring from the base of the membranous covering, they expand, get a mouth and tentacles, aid in feeding themselves by greedily taking any small particles of animal food offered to them, and seem also to share in the sustenance provided by the mother, as they dilate when she is fed; ultimately they separate from her. These madrepores have patches of a milk-white fluid substance, which unite and almost cover the space between the mouths and the rows of tentacles: in others of the madrepore tribe these patches are purple, green, yellow, or ultramarine blue. The Caryophylliæ have locomotion while their skin is soft, but no activity; they merely avoid obstacles, and move away from one another; but, as soon as they get their hard calcareous coat, they become permanently fixed, and no longer undergo division or gemmation, but lay eggs.[29] The European Caryophylliæ never have more than one star, but sometimes a great many individuals are united in a spreading bunch, as in the madrepore Lobophylla angulosa (fig. 130), or in a branched or tufted mass. Their exterior is invariably striated, and each terminates in a star, with the polypes, mouth and tentacles in its centre. These compound madrepores are inhabitants of warm seas.