As the corals approach the conchylia, this interramification decreases. The tubipora forms the transition to the serpula; for the characteristic of all zoophytes, namely, the star shape of their openings, here disappears, and the tubiporæ are distinguished from the rest of the corals by this very circumstance, that the hollow calcareous pipes are placed side by side, without interbranching. In the serpula they have already become separate. How feeble this attempt is to individuate, is most clearly shown in their mode of generation. Notwithstanding the report of Professor Pallas, it still remains doubtful whether there exists any actual copulation among the polypi. The mere existence of a polypus suffices for its endless multiplication. They may be indefinitely propagated by cuttings, so languid is the power of individuation, so boundless that of reproduction. But the delicate jelly dissolves, as lightly as it was formed, into its own product, and it is probable that the Polynesia, as a future continent, will be the gigantic monument, not so much of their life, as of the life of Nature in them. Here we may observe the first instance of that general law, according to which Nature still assimilates her extreme points. In these, her first and feeblest attempts to animalize organization, it is latent, because undeveloped, and merely potential; while, in the human brain, the last and most consummate of her combined energies, it is again lost or disguised in the subtlety(15) and multiplicity of its evolution. In the class immediately above (Mollusca) we find the individuals separate, a more determinate form, and in the higher species, the rudiment of nerves, as the first scarce distinguishable impress and exponent of sensibility; still, however, the vegetative reproduction is the predominant form; and even the nerves “which float in the same cavity with the other viscera,” are probably subservient to it, and extend their power in the increased intensity of the reproductive force. Still prevails the transitional state from the fluid to the solid; and the jelly, that rudiment in which all animals, even the noblest, have their commencement; constitutes the whole sphere of these rudimental animals. In the snail and muscle, the residuum of the coral reappears, but refined and ennobled into a part of the animal. The whole class is characterised by the separation of the fluid from the solid. On the one side, a gelatinous semi-fluid; on the other side, an entirely inorganic, though often a most exquisitely mechanised, calcareous excretion.