. Annual report of the Regents. New York State Museum; Science. Geneea of the N'ortii American Palaeozoic Bryozoa. 431 larium with a captive worm, longer than the polyp cell; of course the avicularia can not convey food to the mouth, and the animal is incapable of swallowing any but the most minute particles. Any capture by an avicularium is clearly accidental, caused by the mandible shutting as the particle floated beneath it, and the constant flapping of the mandible would tend to create a current away from it. According to other authors its functions are purely defensive. "They may eit

- Image ID: RT0689
. Annual report of the Regents. New York State Museum; Science. Geneea of the N'ortii American Palaeozoic Bryozoa. 431 larium with a captive worm, longer than the polyp cell; of course the avicularia can not convey food to the mouth, and the animal is incapable of swallowing any but the most minute particles. Any capture by an avicularium is clearly accidental, caused by the mandible shutting as the particle floated beneath it, and the constant flapping of the mandible would tend to create a current away from it. According to other authors its functions are purely defensive. "They may eit
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Image ID: RT0689
. Annual report of the Regents. New York State Museum; Science. Geneea of the N'ortii American Palaeozoic Bryozoa. 431 larium with a captive worm, longer than the polyp cell; of course the avicularia can not convey food to the mouth, and the animal is incapable of swallowing any but the most minute particles. Any capture by an avicularium is clearly accidental, caused by the mandible shutting as the particle floated beneath it, and the constant flapping of the mandible would tend to create a current away from it. According to other authors its functions are purely defensive. "They may either arrest or scare away unwelcome visitors. Their vigorous movement and the snapping of their formidable jaws may have a wholesome or deterrent effect on loafing annelids or other vagrants, while the occasional capture of one of them may help still further to pro- tect the colony from dangerous intrusion.'' (Hincks.) But the avicularia occur only on the Cheilostomata, and as other forms are without them, it shows that they are unnecessary as weapons of defense.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. New York State Museum; University of the State of New York. Board of Regents. Albany : J. B. Lyon, State Printer

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