x CONTENTS 



PAGE 



EYE (continued) 



of Amphibians 281 



of Reptiles and Birds 282 



of Mammals 283 



Retina 284 



Accessory Organs in Connection with the Eye 286 



a. Eye-Muscles 286 



6. Eyelids 287 



c. Glands 288 



AUDITORY ORGAN (general description and development) . . . 290 



of Cyclostomes 295 



of Fishes 295 



of Amphibians 297 



of Reptiles and Birds 299 



of Mammals 301 



F. ORGANS OF NUTRITION 308 



ALIMENTARY CANAL AND ITS APPENDAGES (general 



description) 308 



I. ORAL CAVITY 312 



Teeth (general description) 313 



of Fishes and Amphibians 314 



of Reptiles and Birds 316 



of Mammals 318 



Glands of the Mouth 324 



of Amphibians 325 



of Reptiles 325 



of Birds 326 



' of Mammals 327 



Tongue 327 



THYROID 331 



THYMUS . . . 333 



II. CESOPHAGUS, STOMACH, AND INTESTINE 335 



of Ichthyopsida 335 



of Reptiles 339 



of Birds 339 



of Mammals 341 



Histology of the Mucous Membrane of the Alimentary Canal 344 



LIVER 346 



PANCREAS ... 348 



G. ORGANS OF RESPIRATION 351 



I. GILLS 351 



of Amphioxus 352 



