CONTENTS 



PAGE 



214 

 216 

 216 



217 

 217 

 22(1 



EYE (general description and development) . . 207 



of Cyclostomes . . ... . . . •-.11 



of Fishes and Dipnoans . • . ■ 211 



of Amphibians . . . . • 212 



of Reptiles and Birds • 213 



of Mammals . . • . . ^14 



Retina . . . 



Accessory Organs in Connection with the Eye 



a. Eye-Muscles . . ... 



(). Eyelids .... ... 



i\ Glands . ■ • • 



AUDiTOEY OKCAN (general description and development) 



of Cj'clostomes 224 



of Fishes and Dipnoans . . . • . 224 



of Amphibians . . 226 



of Reptiles and Birds . ... . 227 



of Mammals - ■ 229 



F. ORGANS OF MUTRITION 2.3.5 



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 

 Glands of the Mouth 



of Amphibians 



of Reptiles . 



of Birds . . 



of Mannnals . 

 Tongue . . . 



THYROID . .... . . . . 255 



THYMUS . . . . . . 256 



II. (EKOPHACUS, STOMACH, AXD INTESTINE . . . 257 



of Ichthyopsida . . ... . 257 



of Reptiles . .... 262 



of Birds . . 262 



of Mammals . . 263 



Histologj' of the Mucous Menilirane of the Alimentary Canal 267 



LIVER .... . ... . . 269 



i'.VNCREAS . . . ... 272 



G. ORGANS OF RESPIRATION . . 273 



I. GILLS . . .... , 273 



of Amphioxus , . . . • . 275 



of Cyclostomes . . . . . . 275 



245 

 251.1 

 251 

 2ol 

 252 



