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A Contribution to the Study of Ophiurans of the United States National Museum Volume 84: (English)

A Contribution to the Study of Ophiurans of the United States National Museum Volume 84: (English)

          
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About the Book

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. 1914 Excerpt: ...proximal angle limited by two straight sides which meet, by a rounded angle, the distal side, which is more or less convex; the latter is usually parted into two sides, united by a rounded and protruding angle. According to the more or less protruding character of this angle, the shield is either triangular or lozenge-shaped. The adoral plates are elongated, narrow, three or four times longer than wide, with almost parallel edges; they send outwardly a rather narrow blade which separates the mouth shield from the first lateral brachial plate. The oral plates are fairly large, high, and triangular. The oral papillae, as a rule, are three on each side; the external one is flattened and very much widened, chiefly at its base, but it often has an end which is thinner and terminates in an obtuse point. Such is, at least, the arrangement which I observe on the example from station 2725 and which I also find on one of the specimens from station 2105, the diameter of the disk of which reaches 14 mm. On the others the arrangement of the oral papillae remains regular at least on certain sides of the oral angles, but it is more or less altered on other sides. Verrill has pointed out that "sometimes an additional smaller one oral papilla stands out of line, behind those in the regular row." On the specimen from which I made my description (pl. 11, fig. 2), one of the oral plates carries a supplemental papilla, so that there are four in all on that side, the external one always keeping the usual widened form, and the other three being conical and equal; on another side I notice a little papilla which lies near the second normal one; the other eight sides present the usual arrangement. On two other examples there is on two sides a little supplemental papilla lo...


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Product Details
  • ISBN-13: 9781151040442
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 80
  • Series Title: English
  • Weight: 159 gr
  • ISBN-10: 1151040444
  • Publisher Date: 18 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 4 mm
  • Width: 189 mm


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