GEPHYREA AND PHORONIS CHAPTER XV GEPHYREA INTRODUCTION—ANATOMY—DEVELOPMENT—SIPUNCULOIDEA—PRIAPULOIDEA —ECHIUROIDEA—EPITHETOSOMATOIDEA—AFFINITIES OF THE GROUP 411 CHAPTER XVI PHORONIS HISTORY—HABITS—STRUCTURE—REPRODUCTION—LARVA—METAMORPHOSIS—LIST OF SPECIES AND LOCALITIES—SYSTEMATIC POSITION 450 POLYZOA CHAPTER XVII POLYZOA INTRODUCTION—GENERAL CHARACTERS AND TERMINOLOGY—BROWN BODIES—HISTORY —OUTLINES OF CLASSIFICATION—MARINE POLYZOA—OCCURRENCE—FORMS OF COLONY AND OF ZOOECIA—OVICELLS—AVICULARIA—VIBRACULA—ENTOPROCTA 465 CHAPTER XVIII POLYZOA—_continued_ FRESH-WATER POLYZOA—PHYLACTOLAEMATA—OCCURRENCE—STRUCTURE OF _CRISTATELLA_—DIVISION OF COLONY—MOVEMENTS OF COLONY—RETRACTION AND PROTRUSION OF POLYPIDES IN POLYZOA—STATOBLASTS—TABLE FOR DETERMINATION OF GENERA OF FRESH-WATER POLYZOA—REPRODUCTIVE PROCESSES OF POLYZOA—DEVELOPMENT—AFFINITIES—METAMORPHOSIS—BUDDING 492 CHAPTER XIX POLYZOA—_continued_ CLASSIFICATION—GEOGRAPHICAL DISTRIBUTION—PALAEONTOLOGY—METHODS FOR THE EXAMINATION OF SPECIFIC CHARACTERS—TERMINOLOGY—KEY FOR THE DETERMINATION OF THE GENERA OF BRITISH MARINE POLYZOA 515 ADDENDUM TO CHAETOGNATHA 534 INDEX 535 SCHEME OF THE CLASSIFICATION ADOPTED IN THIS BOOK PLATYHELMINTHES (p. 3) Family. TURBELLARIA (p. 3) | +— POLYCLADIDA (p. 7) | | | +—— ACOTYLEA (p. 16) | | | | | +—— Planoceridae (p. 19). | | +—— Leptoplanidae (p. 19). | | +—— Cestoplanidae (p. 19). | | +—— Enantiidae (p. 19). | | | +—— COTYLEA (p. 16) | | | +—— Anonymidae (p. 19) | +—— Pseudoceridae (p. 19). | +—— Euryleptidae (p. 19). | +—— Prosthiostomatidae (p. 19). | +—— TRICLADIDA (p. 30) | | | +—— PALUDICOLA (p. 30) | | | | | +—— Planariidae (p. 42). | | | +—— MARICOLA (pp. 30, 32) | | | | | +—— Procerodidae (p. 42). = Gundidae. | | +—— Bdellouridae (p. 42). | | | +—— TERRICOLA (pp. 30, 33) | | | +—— Bipaliidae (p. 42). | +—— Geoplanidae (p. 42). | +—— Rhynchodemidae (p. 42). | +—— RHABDOCOELIDA (p. 42) | +—— ACOELA (p. 42) | |