CONTENTS. 
Vll 
PAGE 
CHAPTER XVI. 
* 
Insecta ( Insects ), 149 
CHAPTER XVII. 
Insecta ( Insects ) — Continued , ..... 158 
CHAPTER XVIII. 
Insecta ( Insects ) — Continued , 170 
CHAPTER XIX. 
Insecta ( Insects ) — Continued , 178 
CHAPTER XX. 
Arachnida ( Spiders , Scorpions, and Mites), . . 184 
CHAPTER XXI. 
Rotifera ( Wheel-bearers), 195 
CHAPTER XXII. 
Crustacea ( Crabs and Shrimps), 204 
CHAPTER XXIII. 
Crustacea (Crabs and Shrimps) — Continued, . . 213 
CHAPTER XXIV. 
Cirripedia ( Barnacles ), , . . .. . . 223 
CHAPTER XXV. 
Polyzoa and Tunicata, 227 
CHAPTER XXVI. 
CONCIIIFERA AND GASTROPODA, (Shell- fish) , ... 239 
