CONTENTS ix 



CHAPTER XV 



PAGE 



THE KIDNEYS AND THE REPRODUCTIVE ORGANS BREEDING . . . 397 



CHAPTER XVI 

 CYCLOSTOMATA (SYSTEMATIC 421 



CHAPTER XVII 



ELASMOP.RANCHII : GENERAL CHARACTERS PLKUROPTEKYGII ICHTHYOTOMI 



ACANTHODEI PLAGIOSTOMI SELACHII BATOIDEI HOLOCEPHALT . 431 



CHAPTER XVIII 



TELEOSTOMI : GENERAL CHARACTERS CROSSOPTERYGII CHONDROSTEI 



HOLOSTEI ............ 475 



CHAPTER XIX 



DlPNEUSTI .... 505 



CHAPTER XX 



APPENDIX TO THE FISHES: PALAEOSPONDYLIDAE OSTRACODERMI HKTERO- 



STRACI OSTEOSTRACI ANASPIDA AXTIARCHI ARTHRODIRA . . 521 



CHAPTER XXI 



TELEOSTEI : GENERAL CHARACTERS MALACOPTERYCJII OSTARIOPHYSI . 541 



CHAPTER XXII 



TELEOSTEI (coynyuED) : SYMBRANCHII APODES HAPLOMI HETEROMI 



CATOSTEOMI PERCESOCES ANACANTHINI ...... 597 



CHAPTER XXIII 



TELEOSTEI (CONTIXUED} : ACANTHOPTERYGII OPISTHOMI PEDICULATI 



PLECTOGNATHI ........... 650 



INDEX 729 



