CONTENTS. IX 



CHAPTER XIII. 



General characters of the Arthropocla — Divisions of the Arthro- 

 poda — General characters of the Crustacea — Decapoda — 

 Macrura — Anoniura — Brachyura — Stomai)oda — Is(jpoda — 

 Amphipoda — Licrnodij^oda — Merostomata — Trilobita — Phyl- 

 lopoda — Cladocera, Copepoda, and Ostracoda — Ichthyopli- 

 thira — Cirrijjedia — Uhizocephala, . , . .136-150 



CHAPTER XIV, 



General characters of the Arachnida — Podosoniata — Acarina — 



Pedipalpi — Araneida, . . .... 1.51-1.56 



CHAPTER XV. 



General characters of the ilyriapoda — Centi[)edcs — Millipedes — 



Pauropoda — Ctnychophoi'a, ..... 157-159 



CHAPTER XVI. 



General charactei's and anatomy of Insects — Metamorphosis of 



Insects, ....... 160-167 



CHAPTER XVII. 



Orders of Insects — Anoplura — Mallophaga — CoUembola — Thy- 

 sanura — Herniptera — Orthoptera — Neuroptera — Aphanip- 

 tera — Diptera — Lepidoptera — Hymenoptera — Strepsiptera — 

 Colooptera, ....... 168-182 



CHAPTER XVIII. 



General characters of tlie JloUusca — Pi-imary divisions of the 



MoUusca, ....... 183-186 



CHAPTER XIX. 



Molluscoi<la — (jciic]-al characters of the Pol}'zoa — (ieneral charac- 

 ters of the Tunicata — General characters of the Brachioijoda, 187-195 



CHAPTER XX. 



Classes of the McjUusca pi-oper — General characters of the Lamel- 

 libranchiata — General characters of the Gasteropoda — Nudi- 

 branchiata — Heteropoda — Air-breathing Gasteropods — Pter- 

 opoda, ....... 186-207 



