Papers from the Tortugas Laboratory of the Carnegie Institution of Washington Volume 15
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Papers from the Tortugas Laboratory of the Carnegie Institution of Washington Volume 15

Papers from the Tortugas Laboratory of the Carnegie Institution of Washington Volume 15


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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. 1921 Excerpt: ...as far back as the third somite (plate 6, figure 2). There are two pairs of anal cirri, one being much larger than the other (plate 6, figure 4). The peristomium is about as long as the prostomium, a little wider on the posterior than on the anterior margin, and about twice as long as the second somite (plate 6, figure 2). The succeeding somites are practically uniform in width and length until they narrow toward the posterior end. In the type specimen the gills begin on somite 25 with a double filament, while they appear as a single filament on the left of somite 24, becoming double in 25. The number of filaments is very irregular; on the right side of the type, for example, somites 25 to 34 show 2, 1, 1, 2, 2, 2, 2, 2, 4, 2 filaments, respectively. Together with this irregular addition of filaments, there is an increase in length, though in the fully expanded animal the filaments do not meet over the mid-dorsal line (text-figure 212). The greatest number of filaments I could find in the type was five. Toward the posterior end the number of filaments becomes reduced to one again, but this is longer than in anterior somites. The last gill is on the twenty-fourth somite from the posterior end. On the base of the posterior gills there is a prominent pigment spot. The first parapodium (text-figure 213) has the dorsal cirrus a little longer and more pointed than the ventral one and with a conical post-setal lobe; it bears several aciculae. The tenth parapodium (text-figure 214) has a dorso-lateral post-setal lip; the setal lobe has two lips, one dorso-posterior and the other ventro-anterior. The dorsal cirrus has a constricted base, then widens abruptly, becoming narrow toward the tip. The ventral cirrus has a broad base of attachment and is bluntly rounded at ...


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Product Details
  • ISBN-13: 9781130698411
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 66
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1130698416
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 136 gr


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