CONTENTS. xm 



CHAPTER XXXVII. 



Divisions of the Arachnida — Podosomata — Acarina — Adelarthroso- 



mata— Pedipalpi — Araneida, 238-244 



CHAPTER XXXVIII. 



Myriapoda — General characters of the class — Chilopoda — Chilog- 



natha — Pauropoda — Distribution of Myriapoda in time, , 245-248 



CHAPTER XXXIX. 



General characters of the Insecta — Metamorphoses of Insects — Sexes 

 of Insects, 248-257 



CHAPTER XL. 



Divisions of the Insecta — ^ Anoplura — Mallophaga — Thysanura — 

 Hemiptera — Orthoptera — Neuroptera — Aphaniptera — Diptera — 

 Lepidoptera — Hymenoptera — Strepsiptera — Coleoptera, . 257-273 



CHAPTER XLI. 



General characters of the MoUusca — Digestive system — Circulatory 

 system — Respiratory system — Nervous system — Reproduction — 

 Shell, .......... 274-278 



CHAPTER XLII. 



MoUuscoida— Polyzoa — Distinctions between the Polyzoa and Hy- 

 drozoa — Polypide of the Polyzoa — Anatomy of the Polyzoa — 

 Reproduction and development — Divisions of the Polyzoa, . 279-287 



CHAPTER XLI 1 1. 

 Tunicata— General characters — Development — ^Types of— Homologies 



— Divisions, 287292 



CHAPTER XLIV. 

 Brachiopoda — General characters — Shell — Arms— Atrial system — 



Divisions, 292-297 



CHAPTER XLV. 



Distribution of MoUuscoida in space — Distribution of MoUuscoida in 



time, . 297-299 



CHAPTER XLVI. 



General characters and divisions of the Mollusca Proper— Lamelli- 

 branchiata— General characters and anatomy— Divisions — Fami- 

 lies pf the Lanpellibranchiata, , ..... .300-308 



CHAPTER XLVII. 

 Encephala — Gasteropoda — General characters — Development— Shell 

 f.f Gasteropoda, . . 308-312 



