The Stylasterina Of The Siboga Expedition

Author : Sydney J. Hickson
Publisher :
ISBN 13 : 9781332201587
Total Pages : 52 pages
Book Rating : 4.2/5 (15 download)

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Download or read book The Stylasterina of the Siboga Expedition (Classic Reprint) written by Sydney J. Hickson and published by . This book was released on 2015-08-05 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Stylasterina of the Siboga Expedition The association of the genus Millepora with the family Stylasteridae in one Order of the Hydrozoa called the Hydrocorallina is not justified by recent investigations of their anatomy. Apart from the fact that Millepora agrees with the Stylasteridae in forming a continuous coenosteum of calcium carbonate and exhibits dimorphism of the zooids, it has no characters in common with them. On the other hand in the structure of the nematocysts, the structure of the dactylozooids, the general characters of the coenosteum and its relations to the soft parts Millepora shows no close relationship to the Stylasteridae. Finally the discovery made by one of us) that the male and female sexual cells of Millepora are borne by free-swimming medusae of a very distinct and definite type necessitates the separation of this genus from the other Hydrozoa and the establishment of a new sub-order for its reception. It appears to us that to express more accurately the relations of the old group Hydrocorallinae, Millepora should be placed in an Order Milleporina situated in our system next to the Hydromedusae, whilst the family Stylasteridae should be placed in an Order Stylasterina situated near to the Trachymedusae. 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.