ARTHROPODS, 9 
Fic. g.—Cephalopod (paper nautilus, female). 
Arthropods. — This large series includes Crustaceans, 
Myriopods, Insects, Spiders, and other forms, which have 
segmented bilaterally symmetrical bodies and jointed 
Fic. 10.—Fresh-water crayfish Fic. 11.—a, Caterpillar ; 
(Astacus), a Crustacean,— 6, pupa; ¢, butterfly. 
After Huxley. 
