Bulletin No6 Of The Illinois State Museum Of Natural History Description Of New Species Of Palaeozoic Echinodermata

Author : S. A. Miller
Publisher :
ISBN 13 : 9781332299997
Total Pages : 118 pages
Book Rating : 4.2/5 (999 download)

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Download or read book Bulletin No; 10 of the Illinois State Museum of Natural History written by S. A. Miller and published by . This book was released on 2015-08-05 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Bulletin No; 10 of the Illinois State Museum of Natural History: New Species of Echinodermata and a New Crustacean From the Palaeozoic Rocks There are, therefore, twenty-nine arms and twenty-nine ambulacral openings to the vault in this species. The interradial areas all connect with the plates of the vault. In each regular interradial area the first plate is about the size of a second primary radial. It is followed by two smaller plates in the second range, and these by two smaller plates in the third range, and these by a single elongated plate in the fourth range, in each of three areas, that unites with two plates belonging to the vault. In the other area there are two elongated plates, in the fourth range, that unite with the plates of the vault. There is an elongated plate in each intersecondary ares that separates the quaternary plates and unites with the plates of the vault in some of the areas. There are ten plates in the azygous area. The first one is in line with the first primary radials, but somewhat smaller. It is followed by two plates in the second range, three in the third, two in the fourth, and two narrow elongated plates in the fifth range, that unite with the plates of the vault. The vault is highly convex, depressed toward the interradial areas, and covered by numerous polygonal plates, about one fourth of which bear spines. The proboscis is central, but broken off in our specimen. This is the first twenty-nine armed species described from the Burlington Group, and so different from all thirty-armed species that no comparison with any of them is necessary. Found by F.A. Sampson, in whose honor the specific name is proposed, in the Burlington Group at Sedalia, Missouri, and now in his collection. Also found by R. A. Blair, and in the collection of S. A. Miller. 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."