In another section, locomotion is effected by a modification of ciliary apparatus. We have a familiar example in the _Beroe_ of our own seas, a most attractive little being, and a prime favourite with naturalists, who have described its habits and celebrated its beauty with enthusiasm. We shall not soon forget the delight with which we first made acquaintance with this graceful little rover. While rambling along the shore in quest of marine animals, our attention was arrested by a drop of the clearest jelly, as it seemed to be, lying on a mass of rock, from which the tide had but just receded. On transferring it to a phial of sea-water, its true nature was at once revealed to us. A globular body floated gracefully in the vessel, scarcely less transparent than the fluid which filled it. Presently it began to move up and down within its prison-house, and the paddles by means of which the beroe dances along its ocean-path were distinctly visible. These paddles are nothing more or less than cilia of a peculiar kind, ranged in eight bands upon the surface of the body. They are set in motion at the will of the animal, and their incessant strokes propel it swiftly through the water. By stopping some of its paddles, and keeping others in play, the beroe can change its course at pleasure, and so wander 'at its own sweet will,' through the trackless waste. Beauty waits upon the course of this little crystal globe. The grace and sprightliness of its movements must strike the commonest observer. As the sunlight falls upon its cilia, they are 'tinted with the most lovely iridescent colours;' and at night they flash forth phosphoric light, as though the little creature were giving a saucy challenge to the stars. The beroe is a most active being, its habits conforming to the organisation with which it is endowed. Such an array of paddles prophesies of a mercurial temperament and an energetic character. It can, however, anchor itself and lie by when occasion offers. It is provided with two long cables, prettily set with spiral filaments or tendrils, by means of which it can make fast to any point. When not in use, it can retract them, and stow them away in two _sacs_ or pouches within the body, where they may be seen coiled up, through the transparent walls. The mouth is a simple opening at one pole of the globular body. No arms are needed. The beroe is spared the labour and uncertainty of the chase. As it dances gaily along, streams of water, bearing nutritive particles, pass through the orifice into its stomach.