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 (Co ntin ued) . . 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 



