CONTENTS. 



PART I. MORPHOLOGY OF VERTEBRATES. 



PAGE 



Introduction ............ i 



Introductory Embryology ........ 5 



Histology ............ 9 



Morphology of the Organs of Vertebrates . . . . . . 17 



Entodermal Organs .......... 17 



Mouth 18 



Teeth 19 



Tongue 21 



Oral Glands 21 



Gills 22 



Air bladder 25 



Lungs ........... 26 



Thyroid Gland 32, 



Thymus Gland .......... 33 



Digestive Tract 34 



Liver ............ 40 



Pancreas ........... 41 



Ectodermal Structures ......... 43; 



Central Nervous System ........ 43; 



Spinal Cord .......... 44 



Spinal Nerves ......... 46 



Brain 48 



Cranial Nerves ......... 58 



Sense Organs .......... 66 



Lateral Line Organs . . . . . . . 67 



Sense Corpuscles ........ 68 



Auditory Organs ........ 69 



Olfactory Organs ........ 75 



Visual Organs ......... 78 



Epiphysial Organs ........ 84 



Epidermal and Dermal Structures ...... 87 



Skin 87 



Exoskeleton ......... 91 



Scales .......... 92 



Feathers ......... 94 



Hair .......... 97 



\Mesolhelial Structures ......... 100 

 v 



