. Comparative anatomy and physiology. Chap III ] CHJETOPODA. 55. Fig. 20.—Tercbella emmalina. and form the group of the Vagantia; others give up their free mode of life and settle down like Sabella and Serpula into tubes; in these Tubicolse (Fig. 20),. 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 Bell, F. J. (Francis Jeffrey), 1855-1924. London, Cassell

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