Survey of the Animal Kingdom 317 



Fig. 126. 



Fig. 127. 



Fig. 126. — Sowbug (Porcellio laevis) of the class Crustacea, phylum Arthropoda. 

 Much enlarged. A terrestrial type common in dark, damp places. (From 

 Popenoe : Mushroom Pests and How to Control Them, U. S. Department of Agri- 

 culture, courtesy of Bureau of Entomology and Plant Quarantine. ) 



Fig. 127.— Copepod water flea {Cyclops) of the class Crustacea, phylum Arthro- 

 poda. The paired egg sacs are shown near the tip of the body of the female. 

 Found in fresh water. (Copyright by General Biological Supply House, Inc., 

 Chicago.) 



