xvi CONTENTS. 



PAGE 



motion, &c., in the Insecta : The Flight of Insects— Locomotion, 

 &c., in the Arachnida, Crustacea, and Mollusca, &c. • 374 



CHAPTER XIII. 



Reproduction and Development in the Invertehrata : Spontaneous 

 Generation, Gemmation, Fission, Endogenous Cell Formation, 

 Parthenogenesis, Sexual Reproduction, Hermaphroditism, Sexual 

 Elements of Reproduction, Fecundation, Development of the 

 Embryo, and Conjugation — Reproduction in the Protozoa : Investi- 

 gations of Dallinger and Drysdale and others — Reproduction, &c., 

 in the Porifera, Ccdenterata, Echinodermata, Triclwscoliceg, Anne- 

 lida, Nematoscdlices, Cheetognatha, Onychophora, and Myriapoda — 

 Reproduction, &c., in the Insecta: their Odours, Colours, Dances, 

 and Music, as Agents in the Reproduction of the Insecta — Repro- 

 duction in the Arachnida, Crustacea, Polytoa, Srachiopoda, 

 MoVMSca, and Tunieata — Concluding Remarks : Pleomorphism, 

 Origin of Life, &c. . ..... 399 



Appendix . . . . . . 457 



Index of Authorities . ... 461 



Subject Index . . . ... 465 



