TABLE OF CONTENTS. 



Classification of the Invertebrate Animals, 1 



Bibliography, 2 



Introductory JVote to the Infusoria. 



I. THE INFUSORIA AND RHIZOPODA. 



Classification and Bibliography, 3-5 



1. External Covering, 6 



2. Muscular System, and Locomotive Organs, 7-8 



3, 4. Nervous System, and Organs of Sense, 9-10 



5. Digestive Appaijatus, 11-15 



6, 7. Circulatory and Respiratory Systems, 16-1 8 



8. Oi'gans of Secretion, 19 



9. Organs of Reproduction, 20-23 



Introductory JVote to the Zoophyta. 



n. THE POLYPI. • 



Classification and Bibliography, 24 



1. Cutaneous Envelope and Skeleton , 25-28 



2. Muscular System, and Organs of Locomotion, 29-32 



3, 4. Nervous System, and Organs of Sense, . 33-34 



5. Digestive "Apparatus, 35-36 



Digestive Cavity of the Anthozoa, 37 



Digestive Cavity of the Bryozoa, 38 



6, 7. Circulatory and Respiratory Systems, 39-41 



8. Organs of Secretion, 42 



9. Organs of Generation, 43-52 



HI. THE ACALEPHAE. 



Classification and Bibliography, 53 



1. Skin and Cutaneous Skeleton, 54-56 



2. Muscular System, and Organs of Locomotion, 57-58 



3. Nervous System, 59 



4. Organs of Sense, 60 



5. Digestive Apparatus, 61 



6. Circulatory System, 62 



7. Respiratory System 63-64 



