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Home > Art, Film & Photography > A Guide to the Shell and Starfish Galleries; (Mollusca, Polyzoa, Brachiopoda, Tunicata, Echinoderma, and Worms)
A Guide to the Shell and Starfish Galleries; (Mollusca, Polyzoa, Brachiopoda, Tunicata, Echinoderma, and Worms)

A Guide to the Shell and Starfish Galleries; (Mollusca, Polyzoa, Brachiopoda, Tunicata, Echinoderma, and Worms)


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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. 1908 Excerpt: ...stalk. The head and beak contain powerful muscles for opening and shutting a horny lid or mandible hinged on below. In life, the avicularium sways to and fro on its stalk, with the lower "jaw" continually snapping up and down in the most ludicrous fashion. The beak is capable of seizing and holding quite large objects. The function of these curious appendages is partly to warn off trespassers and partly to capture and retain small animals till decomposition has set in; in the latter case, the currents set up by the tentacles draw in the particles to the mouths of the polypides. The avicularia have arisen by modification of the ordinary cells, in which the muscles have developed at the expense of the degenerated polypides, the cells have become much smaller, of different shape, and separated out from the rest; the mandible represents the lid or operculum of the ordinary cell. The avicularia vary greatly in size and shape in the different genera; in Flustra, for instance, these organs closely resemble the ordinary cells. In Bugula Mcornis (Fig. 7), from 1950 fathoms in the Southern Case A. Upright Fig. 7. part. Bugula bieornis. Cells magnified. (After Busk.) Indian Ocean, each cell is provided with two avicularia with remarkably long stalks. The graceful vase-shaped KinetosMas cyathus (Fig. 8), one of the treasures of the " Challenger " Expedition, was dredged from 1525 fathoms off Cape St. Vincent. The stem, which tapers gradually upwards, rises from a tuft of root fibres. The cup is formed of slender branches supported at the base by a delicate membrane. The branches are composed of biserial rows of cells (Fig. 9) opening towards the interior of the cup. The avicularia are Fig. 9. Kinetogldas cyathus. A branch magnified. a, an aviculariu...


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Product Details
  • ISBN-13: 9781130597042
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 36
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130597040
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 82 gr


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A Guide to the Shell and Starfish Galleries; (Mollusca, Polyzoa, Brachiopoda, Tunicata, Echinoderma, and Worms)
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