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Pamphlets on Biology Volume 416; Kofoid Collection

Pamphlets on Biology Volume 416; Kofoid Collection

Pamphlets on Biology Volume 416; Kofoid Collection by Books Group

Pamphlets on Biology Volume 416; Kofoid Collection
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Author: Books Group
Number of Pages: 98 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
Format: Pdf
ISBN: 9781130418811
File size: 12 Mb
Download Link: Pamphlets on Biology Volume 416; Kofoid Collection
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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. 1851 Excerpt: ...diameter of the conch is 15.5 mm, the concavity of the septa is 2 mm, the length of the camerae is 1.4 mm, and the maximum diameter of the segments of the siphuncle 3 mm. There are no traces of the septal necks at the inner margins of the septa, which are combined with both upper and lower connecting rings at acute angles. The calcareous matrix is slightly developed in the camerae of the apical part of the shell, while it fills very densely the camerae of the older part. Formation and locality.--Middle Ordovician, Ssuyen formation: In the lower fossil horizon of the gray banded limestone beds, on Fu-chin-kou ridge, southwest of Miyanohara station on the AntungMukden line, Manchuria. Plesiotype.--U.S.N.M. No. 83716. ARMENOCERAS HAYASAKAI, new species Plate 18, Figures 6, 7 Description.--The holotype is 97 mm long, enlarging from a lateral diameter of 13 mm near its base to 20.5 mm at a point 42 mm farther up, the apical angle being 10. The cross sections of the conch and the siphuncle are somewhat depressed. A small portion of the ventral side is weathered away. Eight camerae occupy a length equal to the lateral diameter of the conch. Where the diameter of the conch is 18 mm, the concavity of the septa is 3 mm, the length of the camerae is 2.5 mm, and the maximum diameter of the segments of the siphuncle is 9.5 mm. The inner margin of the septa, at the passage of the siphuncle through it, curves slightly downward. The overlying connecting rings are adnate to the intermediate septa for a short space in the area immediately surrounding the passage of the siphuncle through the septa, while the underlying connecting rings meet the inner margin of each septum at acute angles. The deposition of calcareous material in the camerae is rather pronounced in the earlier...

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