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Download ebook Papers from the Tortugas Laboratory of the Carnegie Institution of Washington Volume 5
Download ebook Papers from the Tortugas Laboratory of the Carnegie Institution of Washington Volume 5

Papers from the Tortugas Laboratory of the Carnegie Institution of Washington Volume 5 by Carnegie Institution Laboratory

Papers from the Tortugas Laboratory of the Carnegie Institution of Washington Volume 5
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Author: Carnegie Institution Laboratory
Page Count: 92 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130467888
File Name: Papers.from.the.Tortugas.Laboratory.of.the.Carnegie.Institution.of.Washington.Volume.5.pdf
Download Link: Papers from the Tortugas Laboratory of the Carnegie Institution of Washington Volume 5
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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. 1914 Excerpt: ... curve at the tip and becomes broader and somewhat flattened (pl. 3, fig. 2). On the third segment it is distinctly curved at the tip and a tooth is evident on the concave side (pl. 3, fig. 3). On the fourth segment this tooth has become conspicuous and another one has arisen below it (t. e., nearer the base of the spine), while the spine-base is notably large and projecting (pl. 3, fig. 4). On the sixth segment these various features are all accentuated (pl. 3, fig. 5) and on succeeding segments the spine may be said to show its characteristic form (pl. 3, fig. 6). As the animal matures, these lowest arm-spines begin to undergo a sort of retrograde change which well illustrates Hyatt's principle of senescence. Thus if the lowest armspine on the twentieth or thirtieth segment from the mouth be examined, on an adult arm, it will be found essentially like that on the twentieth segment from the tip. But if one from somewhere about the twelfth basal segment be looked at (pl. 3, fig. 7), it will be found to be obviously different from any of the lowest arm-spines of the middle portion of the arm; except that it is immensely stouter, it is more like that of the fourth segment from the arm-tip. It has one notable peculiarity in that foramina are beginning to open through it. Examination of the lowest spine of segment nine, counting from the mouth, shows (pl. 3, fig. 8) a still further reduction of teeth, particularly the terminal one, while there is a corresponding development of the foramina. The lowest spines of the segments still nearer the mouth (pl. 3, figs. 9 and 1o), show these tendencies carried still further. Indeed, except for their smaller size, these basal lowest spines are not essentially different from the ordinary spines of the arm. The development ...

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