CONTENTS 



CHAPTER 



I. The Anatomy and Physiology of Insects : The Cricket 

 ir. The Grassliopper : A Stiidy of the Enemies of Vege- 

 tation ......... 



IIT. The Butterfly : A Study in Animal Coloration 

 IV. The Beetle : A Study in Ecology .... 



V. The FI3' : A Study of Disease-producing Animals 

 VI. Lithohius : A Study of Light-shunners 

 VII. The Spider : A Study of Animal Architecture 

 VIII. The Anatomy and Physiology of Crustacea : The 

 Lol)ster ........ 



IX. The Crayfish : A Study in Geographical Distribution 128 



<^ 



X. Daphnia: A Study of the Food of Fishes 

 XI. The Anatomy and Physiology of Annelids . 

 XII. Tlie Earthworm : A Study in Subterrestrial Or- 

 ganisms ........ 



XIII. Nereis : A Study of Life on the Seashore 



XIV. Tlie Anatomy and Physiology of MoUusca, illustrated 



by the Snail ....... 



XV. The Slug : A Study in Animal Behavior 

 XVr. The Fresh-water Clam : A Study of River Faunas 

 XVIT. The Anatomy and Physiology of Echinoderms, with 

 Particular Reference to the Sea-urchins . 

 XVIII. The Starfish : A Study of Embryology 

 XIX. Hydra : A Study of Attached Animals 



11 



29 

 60 

 70 

 90 

 102 



120 



153 

 101 



108 

 182 



19S 

 208 



238 

 240 

 200 



