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nervous systems running along the body and consisting of two thin threads, knotted at different points into ganglia or masses of nerve cells similar to those possessed by the higher animals. They possess eyes and other sense organs, in some cases highly developed. They possess organs, corresponding to the heart, and have a well-developed digestive apparatus. Note this advance in the nutritive organism: the moneron takes its food at any point of its body; the amoeba takes its food by means of its "false-feet," and drives it through its body by a rhythmic movement of its substance; the polyp distributes its food to its various parts by means of the water which it absorbs with the food; the sea-urchin and star-fish distribute their food by canals in their bodies which open directly into the water; in the higher forms of the annulosa, the food is distributed by a fluid resembling blood, which carries the nourishment to every part and organ, and which carries away the waste matter, the blood being propelled through the body by a rudimentary heart. The oxygen is distributed by each of these forms in a corresponding way, the higher forms having rudimentary lungs and respiratory organs. Step by step the life-forms are perfected, and the organs necessary to perform certain definite functions are evolved from rudimentary to perfected forms.
The families of worms are the humblest members of the great family of the Annulosa. Next come the creatures called Rotifers, which are very minute. Then come the Crustacea, so called from their crust like
