Zoology; a Text-Book for Universities, Colleges And Normal Schools

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228 ZOOLOGY in animals is a most interesting phenomenon to zoologists. This group is the first in which we have found true metamerism. The body of the animals is more or less constricted on the outside into rings — as the name (Annelida) implies. The internal organs also show metamerism, but in various ways. These organs may pass directly through, with slight segmental modification, as the digestive tube and ventral nerve cord; they may be repeated independently in each segment, as the setas or
... nephridial tubules ; or they may be represented in only one or a limited number of n. c.
d n. f.
Fig. 102. Longitudinal section of anterior end of Dero, A, sagittal section; B, frontal section to show anterior portion of nervous system, b, brain; co., nervous collar about the mouth; c.v., contractile blood vessels ("hearts"); d, dissepiment; d.m., dermo-muscular wall; d.v., dorsal blood vessel; m, mouth; n.c, nerve cells; r./., nerve fibres; np., nephridia; p, prostomium; ph., pharynx; s, sets; sn„ segmental nerves; v.g.


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