CONTENTS. 



PART I. 



CHAP, PAGE 

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

 FICATION OF ANIMALS . 3 

 II. PROTOZOA, OR SINGLE-CELLED ANIMALS 17 

 IIL MESOZOA, SPONGES, CCELENTEEATES, AND ECHINODERMS 27 

 IV. WORMS (vermes). PLATYHELMINTHES or FLAT-WORMS 31 



V. WORMS (vermes) — Continued, nemathblminthes or 



bound-worms . 56 



VI. worms (vermes) — Gontinued. ANNELIDA OR SEGMENTED 



WORMS 79 



VII. ABTHROPODA OB JOINTED-LIMBED ANIMALS. (CRUSTACEA, 



MYEIAPODA, AND ABACHNOIDEA) . 86 



VlII. INSEOTA OR HEXAPODA. (cOLEOPTERA, HYMENOPTERA, 

 LEPIDOPTERA, DIPTEBA, THYSANOPTERA, hemipteea, 

 ORTHOPTERA, neuroptera, apteba) 121 



ix. mollusca . 261 



