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Geological Magazine (Volume 4) pdf

Geological Magazine (Volume 4) pdf

Geological Magazine (Volume 4). Henry Woodward

Geological Magazine (Volume 4)
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Author: Henry Woodward
Number of Pages: 296 pages
Published Date: 06 Feb 2012
Publisher: General Books
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781235752407
File size: 15 Mb
Download Link: Geological Magazine (Volume 4)
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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. 1877. Excerpt: ... Genus Psammodus, Agassiz. Psarnmodus rugosus, Agassiz. Plate XIII. Figs. 7-9. P. rugosut, Ag.; Rech. Poissons Fosa. vol. iii. (1833-34), p. Ill, Atlas iii. t. 12, f. 14-18, t. 19, f. 15. M'Coy, Brit. Pal. Foss., p. 644. Tooth.--Oblong, lingual; length, without the lateral prolongation, 2 inches 5 lines; breadth 1 inch 2 lines; height 8 lines. The longer margins of the crown are convex and rounded, with sharp edges, and bound the somewhat concave centre of the crown, which is higher in the middle than at the shorter ends. One of the shorter margins (the anterior?) is obliquely convex, and its edge roughly crenuiated; the other (or posterior?) is somewhat concave or excavated, with the edge a little bevelled outwards and deeply slit vertically. Sides.--The longer sides are more or less vertical, or at right angles to the crown; one of the shorter sides (the anterior?) is bevelled inwards for the articulation of the preceding tooth; the other shorter side is like the longer lateral ones, almost vertical, and is extended backwards with one of the latter to form a pointed, laterally compressed prolongation. Ornamentation.--The crown is covered with minute, vermiform, transverse, tortuous fringed ridges, many of which bifurcate, and become more broken up on the longer lateral margins. The longer lateral sides are roughened. Obs.--The present tooth differs from Agassiz's typical figures in the absence of the prominent rounded eminence on the posterior part of the crown, although one of his specimens appears to have been devoid of it. Agassiz considered that an intimate affinity existed between the teeth he named P. ponsu s and P. rugosus, whilst M'Coy united the two under the one name P. rugosus.' The latter, in his description, says, that the lo...

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