CONTENTS. 



CHAPTER PAGE 



I. BRANCH ARTHROPODA Class Insecta i 



II. BRANCH ARTHROPODA Class Insecta {Continued) . . 25 



III. BRANCH ARTHROPODA 54 



Class i. Myriapoda 54 



Class 2. Arachnida 55 



IV. BRANCH ARTHROPODA Class Crustacea 61 

 V. BRANCH ARTHROPODA Class Crustacea (Continued) . . 77 



VI. BRANCH ANNULATA The Segmented Worms ... 87 



VII. BRANCH MOLLUSCA Class Pelecypoda 102 



VIII. BRANCH MOLLUSCA Class Gastropoda 127 



IX. BRANCH MOLLUSCA Class Cephalopoda ... 138 



X. BRANCH CHORDATA 148 



Subbranch Urochorda . 148 



Subbranch Vertebrata 151 



Class i. Cyclostomata . 153 



Class 2. Pisces 154 



XI. BRANCH CHORDATA Class Pisces (Continued) . . .168 



XII. BRANCH CHORDATA Class Amphibia 181 



XIII. BRANCH CHORDATA Class Reptilia 196 



XIV. BRANCH CHORDATA Class Aves 208 



XV. BRANCH CHORDATA Classification of Aves . ... . 222 



XVI. BRANCH CHORDATA Class Mammalia 246 



XVII. BRANCH CHORDATA Classification of Mammalia . . . 256 



XVIII. BRANCH PROTOZOA The One-celled Animals . . . 286 



XIX. BRANCH PORIFERA The Sponges . ..... 307 



XX. BRANCH CCELENTERATA 313 



Class i. Hydrozoa 317 



Class 2. Scyphozoa 323 



Class 3. Actinozoa . 325 



