. Animal biology. Zoology; Biology. Mouth ^^ Pro ton ephriolium Ganojlion Anal tentacles. Oral tentacles Bye. spots Anus Anus B Fig. 143.—Polygordius sp., showing two stages in the development of the troehophore larva (A, B) and the adult (C). {From Wieman, "General Zoology," after Hatschek and Fraipont, by the courtesy of McGraw-Hill Book Company, Inc.) A and B much magnified, C X about 2. the outside through one or a few openings of a common large duct, seen in previous phyla, are replaced in members of this phylum by a series of excretory organs arranged in pairs, one pair to a me
. Animal biology. Zoology; Biology. Mouth ^^ Pro ton ephriolium Ganojlion Anal tentacles. Oral tentacles Bye. spots Anus Anus B Fig. 143.—Polygordius sp., showing two stages in the development of the troehophore larva (A, B) and the adult (C). {From Wieman, "General Zoology," after Hatschek and Fraipont, by the courtesy of McGraw-Hill Book Company, Inc.) A and B much magnified, C X about 2. the outside through one or a few openings of a common large duct, seen in previous phyla, are replaced in members of this phylum by a series of excretory organs arranged in pairs, one pair to a metamere and each complete in itself. The nervous system, also, instead of showing a general tendency toward the accumulation of cells in a few ganglia or nerve tracts, shows the development of metamerically arranged ganglia connected by a ventral nerve cord. An earthworm is really made up of a series of nervous units. These may act individually but are so related 241. 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 Wolcott, Robert Henry, 1868-1934. New York ; London : McGraw-Hill Book Company, Inc.
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