The Crinoidea Flexibilia (with an Atlas of A.B.C. and 76 Plates) download pdf
The Crinoidea Flexibilia (with an Atlas of A.B.C. and 76 Plates) download pdf
---------------------------------------------------------------
Author: Frank Springer
Page Count: 262 pages
Published Date: 01 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
Format: Pdf
ISBN: 9781236098351
File size: 11 Mb
Download Link: The Crinoidea Flexibilia (with an Atlas of A.B.C. and 76 Plates)
---------------------------------------------------------------
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...individual. It would seem, therefore, that this genus, evolving from a Silurian form like Sagenocrinus or Temnocrinus, underwent its final transformation in the Burlington limestone by taking on an additional primary plate in each ray; and that this was accomplished by a specific change far more complete and decisive than we find in some other cases where the modification was going on in the Devonian. Doubtless if we had all the stages of this development through the Devonian we should see phases of individual variation; but the final stage became firmly established in the genus, with one species tenaciously holding on to its Silurian type of ray structure. It is singular that with this apparently straight line of derivation, no trace of this type has been found in the prolific crinoidal deposits of the Lower Burlington beds at the same locality. We must remember, however, in this and all similar cases what we are constantly prone to overlook--that our collections, even from these prolific and well searched formations, represent only a mere atom of what actually existed during their epoch, or was deposited in their sediments. Types. Hall's original is in the University of Chicago; the other specimens figured are in my own collection. The original of figure 2, PIate XXV, one of the finest specimens known, was found by Mr. J. O. Beebe, a most zealous and intelligent Burlington collector, who presented it to me for use irl this work. Horizon and locality. Lower Carboniferous, Upper Burlington limestone; Burlington, Iowa; Henderson County, Illinois: and Washington County, Indiana. Forbesiocrinus burlingtonensis n. sp. Plate XXVI, figs. 3-5 I have separated under this name those specimens occurring in the Burlington rocks which have three primihrachs. The descri...
Read online The Crinoidea Flexibilia (with an Atlas of A.B.C. and 76 Plates) Buy and read online The Crinoidea Flexibilia (with an Atlas of A.B.C. and 76 Plates) Download and read The Crinoidea Flexibilia (with an Atlas of A.B.C. and 76 Plates) for pc, mac, kindle, readers Download to iPad/iPhone/iOS, B&N nook The Crinoidea Flexibilia (with an Atlas of A.B.C. and 76 Plates)
Download pdf Howdunit: Book of Police Procedure and Investigation
Download PDF, EPUB, MOBI Bobby Jones on Golf
confessions-of-a-country-architect-downloadpdf-epub-mobi
Viktor Frankl's Contribution to Spirituality and Aging download PDF, EPUB, Kindle
duck hunt 2 keygen generator download
The Crinoidea Flexibilia (with an Atlas of A.B.C. and 76 Plates) by Frank Springer
Author: Frank Springer
Page Count: 262 pages
Published Date: 01 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
Format: Pdf
ISBN: 9781236098351
File size: 11 Mb
Download Link: The Crinoidea Flexibilia (with an Atlas of A.B.C. and 76 Plates)
---------------------------------------------------------------
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...individual. It would seem, therefore, that this genus, evolving from a Silurian form like Sagenocrinus or Temnocrinus, underwent its final transformation in the Burlington limestone by taking on an additional primary plate in each ray; and that this was accomplished by a specific change far more complete and decisive than we find in some other cases where the modification was going on in the Devonian. Doubtless if we had all the stages of this development through the Devonian we should see phases of individual variation; but the final stage became firmly established in the genus, with one species tenaciously holding on to its Silurian type of ray structure. It is singular that with this apparently straight line of derivation, no trace of this type has been found in the prolific crinoidal deposits of the Lower Burlington beds at the same locality. We must remember, however, in this and all similar cases what we are constantly prone to overlook--that our collections, even from these prolific and well searched formations, represent only a mere atom of what actually existed during their epoch, or was deposited in their sediments. Types. Hall's original is in the University of Chicago; the other specimens figured are in my own collection. The original of figure 2, PIate XXV, one of the finest specimens known, was found by Mr. J. O. Beebe, a most zealous and intelligent Burlington collector, who presented it to me for use irl this work. Horizon and locality. Lower Carboniferous, Upper Burlington limestone; Burlington, Iowa; Henderson County, Illinois: and Washington County, Indiana. Forbesiocrinus burlingtonensis n. sp. Plate XXVI, figs. 3-5 I have separated under this name those specimens occurring in the Burlington rocks which have three primihrachs. The descri...
Read online The Crinoidea Flexibilia (with an Atlas of A.B.C. and 76 Plates) Buy and read online The Crinoidea Flexibilia (with an Atlas of A.B.C. and 76 Plates) Download and read The Crinoidea Flexibilia (with an Atlas of A.B.C. and 76 Plates) for pc, mac, kindle, readers Download to iPad/iPhone/iOS, B&N nook The Crinoidea Flexibilia (with an Atlas of A.B.C. and 76 Plates)
Download more files:
A Catalogue of Books Printed in Foreign Languages Before the Year 1600 : Forming a Portion of the Library of Robert Hoe ... download torrentDownload pdf Howdunit: Book of Police Procedure and Investigation
Download PDF, EPUB, MOBI Bobby Jones on Golf
confessions-of-a-country-architect-downloadpdf-epub-mobi
Viktor Frankl's Contribution to Spirituality and Aging download PDF, EPUB, Kindle
duck hunt 2 keygen generator download