CONTENTS. 
PAQ3 
INTRODUCTION, 1 
PART I. 
ITift, in: its SPofocr Jfnnns. 
CHAPTER i. 
Infusoria, 9 
CHARTER II. 
Infusoria — Continued , 17 
CHAPTER III. 
Porifera (Sponges), < 25 
CHAPTER IV. 
Porifera (Sponges) — Continued, ... .39 
CHAPTER V. 
Polypifera (Polypes), ' T9 
CHAPTER VI. 
Polypifera (Polypes) — Continued , . ■ • - 58. 
