Download or read book Phylogeny of the Echini Vol 7 written by Robert Tracy Jackson and published by Forgotten Books. This book was released on 2018-02-12 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Phylogeny of the Echini, Vol. 7: With a Revision of Palaeozoic Species, With Seventy-Six Plates During a year recently Spent in Europe, Opportunity Offered to study most of the European species Of Palaeozoic Echini and in many cases the types. In this country Similar Opportuni ties have been enjoyed with American species. The great liberality and kindness of all to whom I applied for permission to study material is later acknowledged in detail, but I cannot refrain from saying here that the freedom and liberality with which the choicest and rarest material was placed in my hands and every facility offered for study at home and abroad, was one of the pleasantest experiences of my life. The present memoir is naturally divided into three parts: first, a study Of the development and comparative morphology of Echini, based on the young, adult, fossil, and living types; second, a proposed systematic classification of Echini based on the preceding studies; third, a revision of Palaeozoic Echini comprising the systematic description of all known forms. The late Professor Alpheus Hyatt originated most important and novel methods of study in Palaeontology. It is both an Obligation and a privilege to say that during many years, when closely associated with him as student and assistant, he impressed upon me the important principles of stages in development, senescence, acceleration, and parallelism. During my first sea-urchin studies I had the privilege Of his ever ready sympathy and personal help. I have tried to carry out this work on his lines and as he would have done it, so far as in me lay. The Hyatt principles are the pith and center Of the work, and I take pleasure in feeling that his views worked out largely on the Mollusca are supported and strengthened by their applica tion to another group of animals. In revising a group, it is most important to see the types or original specimens on which species have been based. Omitting Incertae Sedis, the types have been studied of 69 Of the 119 species Of Palaeozoic Echini described in this memoir. Specimens of 96 Of the species have been studied. These include almost all of the important forms. 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.

Download or read book Phylogeny of the Echini Text written by Robert Tracy Jackson and published by . This book was released on 1912 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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Download or read book Phylogeny of the Echini written by Robert Tracy. Jackson and published by Palala Press. This book was released on 2016-04-27 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Download or read book Phylogeny of the Echini with a Revision of Palaezoic Species written by Jackson Robert Tracy and published by Hardpress Publishing. This book was released on 2013-06 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.

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