xiv CONTENTS 



PAGE 



EYE (general description and development) 207 



of Cyclostomes 211 



of Fishes and Dipnoans 211 



of Amphibians 212 



of Reptiles and Birds 213 



of Mammals 214 



Retina 214 



Accessory Organs in Connection with the Eye 216 



a. Eye-Muscles 216 



6. Eyelids 217 



c. Glands '...,... 217 



AUDITORY ORGAN (general description and development) 220 



of Cyclostomes 224 



of Fishes and Dipnoans 224 



of Amphibians 226 



of Reptiles and Birds 227 



of Mammals 229 



F. ORGANS OF NUTRITION 235 



ALIMENTARY CANAL AND ITS APPENDAGES (general descrip- 

 tion) 235 



i. MOUTH 239 



Teeth (general description) 239 



of Fishes, Dipnoans, and Amphibians 241 



of Reptiles and Birds ' 243 



of Mammals 245 



Glands of the Mouth 250 



of Amphibians 251 



of Reptiles 251 



of Birds 252 



of Mammals 252 



Tongue 252 



THYROID 255 



THYMUS 256 



II. (ESOPHAGUS, STOMACH, AND INTESTINE 257 



of Ichthyopsida . . 257 



of Reptiles 262 



of Birds 262 



of Mammals 263 



Histology of the Mucous Membrane of the Alimentary Canal . 267 



LIVER ' 269 



PANCREAS 272 



G. ORGANS OF RESPIRATION 273 



I. GILLS 273 



of Amphioxus 275 



of Cyclostomes 275 



