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Home > Art, Film & Photography > Fossil Sponge Spicules from the Upper Chalk; Found in the Interior of a Single Flint-Stone from Horstead in Norfolk
Fossil Sponge Spicules from the Upper Chalk; Found in the Interior of a Single Flint-Stone from Horstead in Norfolk

Fossil Sponge Spicules from the Upper Chalk; Found in the Interior of a Single Flint-Stone from Horstead in Norfolk


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: 35 Geodia? sp. (Plate II, figs. 13, 14, 15). Spicules with an elongated, moderately robust, straight, shaft, having a constriction at the upper end, below which, in some specimens, there is a slight inflation; the shaft gradually tapers to a point. The rays of the head are short, slightly curved at their junction with the shaft, then straight and pointed. They extend forwards nearly in a line with the shaft itself. Specimens with the rays bifurcate or compound are equally as numerous as those with the rays simple. These spicules are well characterized by the constriction at the top of the shaft and by the manner in which the head-rays extend directly forwards. The length of an average specimen is 2,29 mm.; thickness of shaft 0,135 nim.; and width across the head 0,2 mm. A spicule with a similar diposition. of the head rays but apparently a larger form, is figured from the North of Ireland (Wright: op. cit. PI. II, fig. 22). This and a few other forms of spicule, described below, in which the head rays are either directed forwards or else recurved, appear to resemble those spicules of Mr. Carter's group of the Pachytragidae which he has termed anchoring spicules and it is probable that they were associated with the larger trifid spicules, which I regard as the zone spicules of the same division of sponges. As a rule these fossil fork and anchor spicules are much larger than those in existing sponges, but this might be expected from the greater dimensions of the zone spicules. Geodia, sp. (Plate II, figs. 17, 18, 19). Somewhat delicate spicules with an elongate gradually tapering shaft, and simple, straight or curved, pointed rays extending forwards from the shaft. The rays are frequently chapter{Section 4unequal in length und occasionally one is aborted and the...


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Product Details
  • ISBN-13: 9780217834599
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 20
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 0217834590
  • Publisher Date: 09 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 54 gr


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Fossil Sponge Spicules from the Upper Chalk; Found in the Interior of a Single Flint-Stone from Horstead in Norfolk
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