CONTENTS.

CHAPTER		PAGE
	Introduction	[1]
I.	Structure of the Medusæ	[10]
II.	Fundamental Experiments	[26]
III.	Experiments in Stimulation	[37]
IV.	Experiments in Section of Covered-Eyed Medusæ	[65]
V.	Experiments in Section of Naked-Eyed Medusæ	[104]
VI.	Co-ordination	[130]
VII.	Natural Rhythm	[146]
VIII.	Artificial Rhythm	[175]
IX.	Poisons	[213]
X.	Star-Fish and Sea-Urchins	[254]

JELLY-FISH, STAR-FISH, AND
SEA-URCHINS.