ARTHROPODS. 



FlG. 9. Cephalopod (paper nautilus, female). 



Arthropods. This large series includes Crustaceans, 

 Myriopods, Insects, Spiders, and other forms, which have 

 segmented bilaterally symmetrical bodies and jointed 



FIG. 10. Fresh- water crayfish 

 (Astacus], a Crustacean. 

 After Huxley. 



FIG. II. a, Caterpillar; 

 b t pupa; c, butterfly. 



