On The Crinoid Genus Scyphocri

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ... have a more or less raised transverse girdle, sometimes beaded. Laterally, the brachials often have small, buttress-like projections, which sometimes ramify into the interbrachial network, in which the base of the arms entirely disappears, as if ending in branching roots. The arms are very strong at their bases, tapering gradually to great lengths. They are observed in several specimens for a distance of 300 mm. without reaching the ends; calculating from the taper of the ultimate divisions, and comparing this with the detached distal portions seen occasionally among the specimens, it is clear that the arms were often at least 15 to 20 inches long. They bifurcate at increasing intervals (longest at the inside of the dichotom) three or four times, and frequently one of the last pair once again, thus giving from 80 to 120 ultimate arms. The brachials from the tertibrachs up are exceedingly short and wide throughout; their extreme shortness is a very conspicuous feature, probably characteristic of the genus. The arms are highly rounded dorsally, and have a broad, shallow, ventral furrow, which becomes more deeply notched distally; the cross-section is more or less crescentic; from the truncated horns of the crescent proceed relatively large, closely abutting pinnulars. The form and relative proportions of these plates in the different divisions of an arm are shown by the series of figures on Plate IV. There is so little difference between the anal interradius and the regular areas that it is scarcely noticeable; one more plate in the second or third, and in the fourth anal range is all that differentiates them. The interbrachial pavement.--The most interesting morphological feature of this species is the peculiar interbrachial network, or...

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.

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ... description of the species I. Scyphocr1nus Elegans Zenker Plates I; ii; iii, figs. 1-4; iv; V, figs. 1-5 1833. Scyphocrinites elegans Zenker; Beitr. Naturges. Urwelt, 26, pi. 4, figs. A-F. 1840. Scyphocrinites elegans Zenker; Minister, Beitr. Petref., pt. 3, p. 112, pi. 9, fig. 8. 1850. Scyphocrinites elegans Zenker; Quenst., Handb. Petref., 621, pi. 55, figs. 1-3. 1852-54. Scyphocrinus elegans Zenker; Roemer in Bronn's Leth. Geog., ed. 3, vol. 1, pt. 2, p. 255, pi. 4, figs. 50, b. 1879. Scyphocrinus elegans Zenker; Zittel, Handb. Pal., vol. 1, p. 372. 1881. Scyphocrinus elegans Zenker; Wachs. and Spr., Proc. Acad. Nat. Sci. Phil., 298 (Rev. Pal., pt. 2, p. 124). 1900. Scyphocrinus elegans Zenker; Bather, Ann. and Mag. Nat. Hist., ser. 7, vol. 6, July, p. 115. (?) Syn. Scyphocrinus excavatus and varieties; Waagen and Jahn in Barrande, 1899. Systeme Silur. du centre Boheme, vol. 7, pt. 2, pp. 80-88. After the most careful comparison with the prevalent Bohemian form, not only from the figures and descriptions of Waagen and Jahn, but with four good specimens of my own from Bohemia, I am unable to point out a single diagnostic character by which the Cape Girardeau specimens can be distinguished from it. In the general elongate form of the calyx (which does not appear so constantly in Waagen and Jahn's figures on account of the flattening of many of the specimens), the extraordinary shortness of the brachials beyond the secundibrachs, and the sharp sculpture of the lower plates, they are identical; while substantially every one of the styles of the interbrachial pavement upon which those authors base their three varieties of S. excavatus is to be found among the specimens in this collection. The parallelism in this respect is most...

Excerpt from The Fossil Crinoid Genus Dolatocrinus and Its Allies This paper is the result of studies begun many years ago, with a view to clarifying the record of the crinoid forms herein discussed from the confusion growing out of the excessive activity of some authors in species making. The drawings of the Miller and Gurley types, and those for plates 1 to 4 on Comanthocrinus, Hadrocrinus, and Himerocflnue, were made by Mr. Kenneth M. Chapman of Santa Fe, New Mexico. The text-figures were prepared by my assistant, Dr. Herrick E. Wilson. In the preparation of the other figures upon Dolatocrinus I have had the assistance of Dr. R. S. Bassler in photographing the specimens, and of Miss Francesca Keser, of the United States Geological Survey staff, in retouching the prints, for which I extend to them my sincere thanks. 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.