CONTENTS. 



CHAPTER XIII. 



General characters of the Arthropoda — Divisions of the Arthro- 

 poda — General characters of the Crustacea — Decapoda — 

 Macrura — Anomura — Braohy ura — Stomapoda — Isopoda — 

 Amphipoda — Lsemodipoda — Merostomata — Trilobita — Phy 1- 

 lopoda — Cladocera, Copepoda, and Ostracoda — Ichthyopli- 

 thira — Cirripedia — Rhizocephala, .... 136-150 



CHAPTER XIV. 



General characters of the Arachnida — Podosomata — Acarina — 



Pedipalpi — Araneida, . . .... 151-156 



CHAPTER XV. 



General characters of the Myriapoda — Centipedes — Millipedes — 



Pauropoda — Onychophora, ..... 157-159 



CHAPTER XVI. 



General characters and anatomy of Insects — Metamorphosis of 



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



CHAPTER XVII. 



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

 sanura — Hemiptera — Orthoptera — Neuroptera — Aphanip- 

 tera — Diptera — Lepidoptera — Hymenoptera — Strepsiptera — 

 Coleoptera, ....... 168-182 



CHAPTER XVIII. 



General characters of the MoUusca — Primary divisions of the 



Mollusca, ....... 183-186 



CHAPTER XIX. 



MoUusooida — General characters of the Polyzoa — General charac- 

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



CHAPTER XX. 



Classes of the Mollusca proper — General characters of the Lamel- 

 libranoliiata — General characters of the Gasteropoda — Nudi- 

 branchiata — Heteropoda — Air-breathing Gasteropods — Pter- 

 opoda, ... ... 196-207 



