Excerpt from The Royal Natural History, Vol. 6: Section XII Anchor body; these rows being five in number. A, Tentacles round the mouth;.e, Anchor and plate The internal organs, as vvlll be seen latet shaped spicules; b, c, d, Similar spicules of an alliedform, on, are varlously affected In the varlous classes of the Echinoderms by this five rayed symmetry. A radiate arrangement is not, however, confined to Echino derms, as it also occurs in jelly-fish and sea-anemones. Hence those animals were once grouped with the Echinoderms, under the title of Radiata. But, if a sea-cucumber or a sea - urchin be opened, there is a marked distinction between it and a jelly-fish, in the presence of an intestine, shutoff from the rest of the body-cavity, and often coiling round inside it. In this respect the Echinoderms resemble all the animals that have been dealt with in the preceding pages, whereas the jelly-fish and their allies differ from them in having no body-cavity separated off from the stomach and its processes. Moreover, Echinoderms resemble the higher animals in the possession of a system of branched tubes conveying blood through the body. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.