CONTENTS 



CHAPTER XV 



PAGE 



The Kidneys and the Reproductive Organs — Breeding 397 



CHAPTER XVI 

 Cyclostomata (Systematic) 421 



CHAPTER XVn 

 Elasmobranchii : General Characters — Pleurotterygii — Ichthyotomi 



— AOANTHODEI — PlAGIOSTOMI — SeLACHII — BATOIDEI — HOLOOEPHALt . 431 



CHAPTER XVIII 



Teleostomi : General Characters — Crossopterygii — Chondrostei — 



holostei . 475 



CHAPTER XIX 



DiPNEUSTI 505 



CHAPTER XX 

 Appendix to the Pishes : Palaeospondtlidae — Ostracodermi — Hetero- 



STRACI— OSTEOSTRACI— ANASPIDA— AnTIARCHI— ArTHRODIRA 



521 



CHAPTER XXI 

 Teleostei : Geseral Characters— Malacopterygii—Ostariophysi 541 



CHAPTER XXII 



Teleostei {continued) : Symbranchii— Apodes — Haplomi— Heteromi— 



Catosteomi— Percesooes — Anacanthini .... 597 



CHAPTER XXIII 



Teleo.stbi {continued): Aoanthopterygh — Opisthomi — Pedioulati— 

 Plectognathi 



INDEX ^29 



