BOOK VI. 



INVERTEBRATE ANIMALS. 



THIRD BRANCH: ARTICULATA. 



CLASS I. ANNELIDA. CLASS 1 1 . C R U ST A B A. 

 CLASS III. ARACHNIDA. 



CLASS IV. INSECTA. 



ENTOMOLOGY: THE NATURAL HISTORY OF INSECTS. 



FOURTH BRANCH: RADIATA. 



CLASS L-ECHINODERMA. CLASS II.-INTESTINA. CLASS m.-ACA- 

 LEFHA, CLASS IV.-FOLYPI. CLASS V.-INFUSOEIA. 



