CONTENTS 



The Eyes 213 



The Digestive Organs 220 



The Oral Cavity 223 



Teeth 223 



The Tongue 232 



Oral Glands 235 



Pharynx 238 



The Oesophagus 238 



The Stomach 239 



Intestine 242 



The Liver 248 



The Pancreas 250 



The Respiratory Organs 251 



Gills or Branchias 252 



Pharyngeal Derivatives 262 



The Swim Bladder 266 



Lungs and Air Ducts 269 



The Air Ducts 270 



Lungs 27s 



Accessory Respiratory Structures 285 



Organs of Circulation 285 



Blood and Lymph 286 



The Blood-Vascular System 287 



The Heart 292 



The Arteries 298 



The Veins 307 



The Foetal Circulation 315 



Circulation in the Separate Classes 316 



The Lymphatic System 327 



The Urogenital System 334 



The Excretory Organs 335 



The Reproductive Organs 345 



The Reproductive Ducts 349 



Copulatory Organs 353 



Hermaphroditism 354 



Adrenal System 354 



Urogenital Organs in the Separate Classes • . . . 356 



Nutrition and Respiration of the Embryo — Foetal Envelopes 379 



Bibliography 387 



Definition of Systematic Names 417 



Latin and Greek Roots of Technical Words 423 



Index 431 



