Descriptive and Illustrated Catalogue of the Physiological Series of Comparative Anatomy, Vol. 2

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Excerpt from Descriptive and Illustrated Catalogue of the Physiological Series of Comparative Anatomy, Vol. 2: Contained in the Museum of the Royal College of Surgeons of England In the Echinodermata there are three distinct systems of central nervous organs - superficial oral, deep oral, and apical - that occur, either in the form of a circumaxial ring (apical system of Echinids and Ophiurids), radial cords (apical system of Asterids and deep oral system of Holothurians), or more usually as a combination of the two (superficial oral system). All three are not invariably present, and there is also variation in their respective importance. The superficial oral system occurs in all and usually predominates over the others, but in Crinoids it is relatively weak and the chief place is taken by the enormously developed apical system. 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.