CONTENTS 



CHAPTER PAGE 



I. THE COMMON RED-LEGGED LOCUST 1 



II. THE ALLIES OK THE RED-LEGGED LOCUST: ORTHOPTERA 15 



III. THE MAY-FLIES (PLECTOPTERA) AND THE DRAGON- 



FLIES (Ol)ONATA) 25 



IV. THE BUGS: HEMIPTERA 30 



V. THE BEETLES: COLEOPTEKA 37 



VI. THE BUTTERFLIES AND MOTHS: LEPIDOPTERA ... 4(5 



VII. THE FLIES: DIPTEHA 58 



VIII. THE ANTS, BEES, AND WASPS : HYMENOPTERA . . . 05 



IX. THE INSECTS: HEXAPODA 81 



X. THE DOCTRINE OK EVOLUTION 101 



XL THE SPIDERS AND ALLIES (ARACIINIDA) AND THE CEN- 



TIPEDS AND MlLLEPEDS (MYRIAPODA) . . . .110 



XII. THE CRAYFISH 125 



XIII. THE JOINTED-FOOT ANIMALS: ARTHROPODA . .v . . 138 



XIV. THE CLAM AND OTHER BIVALVES: PELECYPODA . . 157 

 XV. ALLIES OF THE PELECYPODA: MOLLUSCA . . . ". . 177 



XVI. THE EARTHWORM 195 



XVII. ALLIES OF THE EARTHWORM: VERMES 222 



XVIII. THE STARFISH AND SOME ALLIES : ECHINODERMA .x f 230 

 XIX. THE SEA-ANEMONE AND SOME ALLIES: CCELENTERA . 252- 

 XX. THE FRESH-WATER SPONGE AND SOME ALLIES: 



PORIKERA .* .... 273 



XXI. AMCEBA AND SOME ALLIES: PROTOZOA 280 



XXII. THE EVOLUTION OF INVERTEBRATES AND THE ANCESTRY 



OF THE VERTEBRATES ....." 292 



XXIII. THE YELLOW PERCH 305 



ix 



