CONTENTS. 



PART I. 



CHAP. pjjOE 



I. THE CELL AND SIMPLE ANIMAL TISSUES. THE CLASSI- 

 FICATION OF ANIMALS . 3 

 II. PROTOZOA, OR SINGLE-CELLED ANIMALS ]6 



III. SPONGES, CCELENTBRATES, AND ECHINODERMS .32 



IV. WORMS. PLATYHELMINTHES OR FLAT-WORMS . 36 



V. WORMS — Cmitinued. nbmathelminthes or round- 

 worms . . ..... 63 



Yi. worms — Continued, ch^topoda and hirudinea 90 



VII. AHTHROPODA or JOINTED-LIMBED animals. (CRUSTACEA, 



myriapoda, and arachnoidba) . . 97 



VIII. HEXAPODA. (cOLEOPTERA, HYMENOPTERA, LEPIDOPTERA, 

 DIPTBRA, THYSANOPTERA, HEMIPTERA, ORTHOPTERA, 

 NEUROPTBRA, APTERa) . . 138 



IX. mollusca ...... 291 



