CONTENTS. IX 



PAGE 



Definitive circulation 280 



Heart 281 



Aortic arches 282 



Arteries 284 



Veins . , 289 



Fcetal circulation 293 



Circulation in the separate classes 294 



Lymphatic system 302 



Urogenital system 307 



Excretory organs 308 



Reproductive organs 319 



Reproductive ducts . 321 



Excretory organs of the separate groups 326 



Reproductive organs of the separate groups 331 



Copulatory organs 342 



Hermaphroditism 346 



Foetal envelopes 348 



Adrenal organs 352 



Bibliography . 354 



Definition of systematic names 381 



INDEX 385 



