ARTHROPODS 



Fig. 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 



Fir,. 10. — Fresh- water crayfish 

 {Astacus), a Crustacean. — 

 After Huxlev. 



Fig. II. — a, Caterpillar ; 

 b, pupa ; c, butterfly. 



