On the Recent Foraminifera of Great Britain Volume 18

Overview

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. 1858 Excerpt: ...increasing rapidly in diameter, at the same time showing a tendency to abandon the spiral contour and become developed in a straight line, as in CristellariaSegments narrow, covered with distinct, numerous oblique centrifugal sulci, resembling in their arrangement the curves of water thrown off from a ...
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Overview

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. 1858 Excerpt: ...increasing rapidly in diameter, at the same time showing a tendency to abandon the spiral contour and become developed in a straight line, as in CristellariaSegments narrow, covered with distinct, numerous oblique centrifugal sulci, resembling in their arrangement the curves of water thrown off from a revolving wheel. Septal lines curved, depressed, smooth. Septal plane almost linear in old shells; slightly concave, with raised margins. Septal apertures numerous, irregularly scattered over the entire septal plane. Septal angle often approaching nearer to the umbilicus on one lateral surface than on the other. Peripheral margin rounded. Umbilical region concave, smooth. Texture porcelainous, smooth. Hue white, shining. Young shells differ from matured ones in being more nautiloid in form, the anterior segments not increasing in size in so rapid a ratio as at a more advanced stage of growth; also in having a broader septal plane and fewer septal apertures. In very young shells there is but one aperture in each septum, and they gradually increase in number as new segments are added.1 Diam. o Only a few examples of the young state of this shell have been found on our coasts by Mr. George Barlee and Mr. J. G. Jeffreys, in sand dredged by the former gentleman at the Shetland Islands. The species is a widely diffused one, occurring in the Mediterranean, at the Phillipine Islands, Australia, and abundantly in the Gulf of Mexico. It is not improbable that 1 On some of the Microscopical Objects found in the Mud of the Levant, 'Memoirs of the Literary and Philosophical Society of Manchester,' 2d Series, vol. viii, figs. 31, 32, 1847. our British examples have travelled from the latter locality, availing themselves of the locomotive facilities afforded by the Gulf-stre...
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Product Details

  • ISBN-13: 9781150467349
  • Publisher: General Books LLC
  • Publication date: 5/28/2012
  • Pages: 62
  • Product dimensions: 7.44 (w) x 9.69 (h) x 0.13 (d)

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