CONTENTS 



PORIFEPtA (SPONGES) 

 CHAPTER VII 



PACE 



PoRiFERA (Sponges) — Introduction — Hisionv — Descuiption of Hali- 



CHOXDRIA PAXWEA AS AN EXAMPLE OF BRITISH MARINE SPONGF.S AND 

 OF EPHYDATIA FLUVIATILIS FROM FrESH WaTER — DEFINITION — POSI- 

 TION IN THE Animal Kingdom 16;" 



CHAPTER VIII 



PORIFERA {continued): FORMS OF SPICULES — CaLCAREA HoMOCOELA — 



Heterocoela — Hexactinellida— Demospongiae— Tetractinellida 



— Monaxonida — Ceratosa — Key to British Genera of Sponges 183 



CHAPTER IX 



PORIFERA (COXTIXUED) : REPRODUCTION, SkXUAL AND AsEXUAL — PHYSIO- 

 LOGY — Distribution — Flints 226 



COELENTEPATA 

 CHAPTER X 



COELENTERATA — INTRODUCTION — CLASSIFICATION — HyDROZOA — ElEUTHERO- 

 BLAS IE A — Ml LLEPORI NA — GyMNOBL ASTEA — C ALYPTOBL ASTEA — GRAPTO- 

 LiTOiDEA— Stylasterina 245 



CHAPTER XT 



HyDROZOA {COXTIWED) : TrACHOMEDUSAE — XaIUOMEDUSAE— SiPHONOPHORA 288 



CHAPTER XII 



CoELENTERATA (C'O.VT/ATK/j) : SCYPHOZOA = SCYPIIOMEDUSAE . . . 310 



CHAPTER XIII 



CoELENTERATA (COXTIXUED) : AnTHOZOA = ACTINOZOA — GENERAL ChARAC- 



TKRS — Alcyonari.v 326 



CHAPTER XIV 

 Anthozoa (coxtixued) : Zoantharia . . 365 



