xvi CONTENTS. 



TAGE 



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

 &c., in the Arachiida, Cricstacea, and Mollusca, &c. . . 374 



CHAPTER XIII. 



Reproduction and Development in the Invertebrata .- 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, Qdenterata, Echinodermata, Trichoscoliccs, Anne- 

 lida, Nematoscolices, Chcetognatha, 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 Aruclmida, Crustacea, Polyzoa, Brachiojioda, 

 Mollusca, and Tunicatu — Concluding Remarks : Pleomorphism, 

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



Appendix . . . . . . ... . 457 



Index op Authorities ....... 461 



Subject Index ........ 465 



