The floor is covered with hemispherical mounds or domes for the naiads to recline on. The outer wall is composed of formations ranged in festoons of stalactites--not smooth and transparent, but opaque white, and marked with all the wonderful elaboration which characterises zoophytic work in the coral reefs of the Southern seas. This cave contains several sub-caves, each of which has special charms, and the turning of some of the arches is marvellously graceful. One of the recesses is filled with stalactites which look like groups of seaweed. The coral is russet and cream colour and saffron, and there are honeycombed rocks varying in shade from vandyck brown to chrome yellow. Some of the stalactites in the interior sub-caves are transparent. Whichever way the eye is turned it encounters submarine grottoes of fantastic shape, decorated with imitations of algæ. If it were only at the bottom of the Rhine instead of thousands of feet above sea-level, it would seem natural as well as beautiful, but here its existence is simply a wonder, and the sensation produced is fairly described by the last word in the marriage service of the Church of England. Still, "when Mother Fancy rocks the wayward brain," it is easy to associate with it denizens of the deep, and people it with naiads, or with Undines, who were supposed to marry human beings, and, in certain conditions, become endowed with human souls. The cave is about 15 feet high, and from 15 to 20 feet broad. Some of the coralline ledges at the sides are remarkably handsome, and many of the stalactites are from six to eight inches in diameter. The cavern is elegant in its proportions, highly favoured in regard to stalactite growth, graceful in contour, and rich in colouring. THE FOSSIL BONE CAVE.