We should now return to the staircase, near where the Botocudos and Australian illustrations are. Here two large tanks are fitted up as marine aquaria. The specimens are arranged in real sea-water. In the tank under the staircase, and nearest to the Botocudos, are placed specimens of the swimming fish most generally found on the coasts of Great Britain. It is not necessary here to particularise any of the various kinds, as a system has been adopted of affixing the specific names to the tank itself, for the readier and more effective identification of these interesting objects. In the other tank, on the left-hand, those species of Crustaceæ which may be most properly designated _active Crustaceæ_ are exhibited. A similar plan for the identification of the specimens is adopted as with the other tanks. Amongst these interesting specimens, the curious movements of the Soldier Crab, or, as called by some, the Hermit Crab, are very noticeable. This peculiar animal is not himself gifted with a shell upon his body, although his legs and claws are covered with the usual protection. To remedy this want, his habit is to attack some univalve, most generally the common Whelk, and having devoured the inmate, to adopt the shell as his own, moving about with it from place to place with great apparent convenience. He is not, however, always left in undisturbed possession of his stolen tenement, for the _Actinea parasitica_ frequently attaches himself, with apparent purpose, to the shell, and thus, as it were, enslaves the inmate. The crab can, however, easily adapt himself to a new habitation, and may be frequently induced to the operation, if tempted by the introduction of a better shell. The tanks containing the Madrepores, Actineæ, and those species of Molluscous animals, which from their habits may be termed _inactive_, will be described in the proper positions on the other side of the Nave. Crossing the Nave in front of the screen of Kings and Queens, we continue our examination of the various Natural History illustrations on the garden side of the Palace. Keeping then to the extreme right of this division, the first group we come to illustrates generally the Bushmen of South Africa. These have been variously designated by travellers as Bosjesmen and Earthmen, but are of one race. The group represents an entire family. This singular race of beings are persecuted and despised not only by Europeans but by the other tribes. They are migratory, and fix their abodes on unappropriated tracts of land, which frequently separate hostile tribes. The race is fast disappearing. The animals of this division (South Africa) are the Hippopotamus, the Bubaline Antelope, a large Crocodile, and on the rocks opposite to the Hippopotamus is the Cape Hyrax, or Rock Rabbit, a curious animal, much more nearly related to the Rhinoceros than to the Rabbit.