xii CONTENTS 



PAGE 



I. URINOGENITAL ORGANS (general description and develop- 

 ment) 441 



Pronephros 443 



Mesonephros . 445 



Metanephrous 446 



Male and Female Generative Ducts 446 



Gonads 450 



URINARY ORGANS ... ... 452 



of Amphioxus .... 452 



of Fishes . 452 



of Amphibians 455 



of Repti]es and Birds 459 



of Mammals . . . 461 



GENITAL ORGANS ... 463 



of Amphioxus . 463 



of Fishes . 463 



of Amphibians . ... 469 



of Reptiles and Birds 474 



of Mammals . 477 



AITESSORY UENITAL GLANDS OF MAMMALS . ... 484 



COPULATORY ORUANS .... . 486 



ADRENAL BODIES 4!'L' 



APPENDIX (Bibliography) 497 



INDEX 565 



