TABLE OF CONTENTS. 
Classification of the Invertebrate Animals,. « . 2 eee eee 
Bibliography, « «se ee eee eer cere ere rseee 
Introductory Note to the Infusoria. 
I, THE INFUSOBIA AND RHIZOPODA. 
Classification and Bibliography,- « » « 
1, External Covering, . . ig eS o-. 
2. Muscular System, and Locomotive Organs, 
8, 4. Nervous System, and Organs of Sense, 
5. Digestive Apparatus, 2... s+ ee 
6, 7. Circulatory and Respiratory Systems, 
8, Organs of Secretion,. . . . 22 +> 
9. Organs of Reproduction,. . . . » « 
Introductory Note to the Zoophyta. 
Il. THE POLYPI. 
Classification and Bibliography, «+» -s+« « © 
1, Cutaneous Envelope and Skeleton,. . .. . 
2, Muscular System, and Organs of Locomotion, 
8, 4. Nervous System, and Organs of Sense, . 
5. Digestive Apparatus, . . 2+ 2 eee 
Digestive Cavity of the Anthozoa, . . . 
Digestive Cavity of the Bryozoa, ... 
6, 7. Circulatory and Respiratory Systems, . 
8. Organs of Secretion,. . 2. see ee 
9. Organs of Generation, . .» 2+ s+ 
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“ -I0. THE ACALEPHAE. 
Classification and Bibliography,» » « « «.« 
1. Skin and Cutaneous Skeleton,. . . » ee ee 
2. Muscular System, and Organs of Locomotion, . 
8. Nervous System, 
4, Organs of Sense, ibe (0) 6: coi ve se: ia ey ce 
5. Digestive Apparatus, 
6. Circulatory System, - 
7, Respiratory Bystem, . 0.0 sacs 
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SECTION 
