CONTENTS. 



CHAPTER XVI. 



ISSECTA {Insects) , 



CHAPTER XVII. 

 Insecta (Insects) — Continued, 



CHAPTER XVIIL 

 Insecta (Insects) — Continued, 



CHAPTER XIX. 

 Insecta (Insects) — Continued, 



CHAPTER XX. 

 Arachnida (5 iders, Scorpions, and Mites) t 



CHAPTER XXI. 

 Rotifera ( Wheel-bearers), 



CHAPTER XXII. 



CRUSTACEA (Crabs and Shrimps), . 



CHAPTER XXIII. 

 Crustacea (Crabs and Shrimps) — Continued, 



CHAPTER XXIV, 

 CirRipeDia (Barnacles), . . . 



CHAPTER XXV. 



POLYZOA AND TUNICATA, 



CHAPTER XXVL 



CONCHIFERA AND GASTROPODA, (Shell-fish\ 



