24. The first organized existences which appeared upon the Earth were vegetables of the least complicated organization, designated in botany under the names of cryptogams, acotyledonous plants and monocotyledonous plants, such as lichens, mushrooms, mosses, ferns, and herbaceous plants. One does not now see trees with woody trunks, but only those of the palm species, whose sponge-like trunks are analogous to the stems of herbs.
The animals of this period, which have succeeded to the first vegetation, are exclusively marine. These were at first polyps, radiates, zoophytes, animals whose rudimentary and simple organizations approach most nearly to vegetable forms. Later came fishes and shellfish, the species of which do not exist now.