TABLE OE CONTENTS. 



PAGE 



Introduction i-cxli 



Terminology ii 



General Plan of Structure iv 



The Zogecium vi 



Ectocyst vii 



Communication-plates viii 



Endocyst X 



The Polypide xiii 



Tentacular Crown and Sheath xiv 



Alimentary Canal xviii 



Nervous System xxvii 



Muscular System xxix 



The Perigastric Cavity xxxiii 



The Endosarc xxxv 



Fall and Renewal of the Polypide. — The *' Brown 



BODY " lii 



Modifications of the Zocecial type. — Avicularium Ixiv 



Vibraculum ixxix 



Polypide of the Entoprocta Ixxxiv 



