CONTENTS. L\ 



PAGE 



atioiis Tube-worms Serpula Its Shell Hooks and 

 Bristles Gills Stopper Its Homology and Use Sabella 

 Shell-tube- Gills- Soft-tube-Hook-plumed Sabella-Process 

 of Tube-building, 274-297 



XII. DECEMBER. 



Squirters Affinity with Bivalves Test Gill-sac Branchial 

 Cilia Heart Blood Circulation Digestion Tentacles 

 Eyes Cynthia Currant Squirter Four-angled Squirter 

 Discharge of Eggs Transformations Compound Forms 

 Botrylli Oceanic Forms Pyrosoma Its Luminosity 

 Sponges Their HabitatsVarious Species described with the 

 Forms of their Spicula Motives for Study A Protest against 

 prevalent Errors, ...... 298-327 



