CHAPTER IX. The Chaetopodous Worms—the Archiannelida—Anatomy of _nereis_, As

THE CHAETOPODOUS WORMS—THE ARCHIANNELIDA—ANATOMY OF NEREIS, AS TYPICAL OF THE POLYCHAETA 241

CHAPTER X

CLASSIFICATION OF THE POLYCHAETA—SHAPE—HEAD—PARAPODIA—CHAETAE—GILLS —INTERNAL ORGANS—JAWS—SENSE ORGANS—REPRODUCTION—LARVAL FORMS —BUDDING—FISSION—BRANCHING—REGENERATION 257