CONTENTS. 



PART I. MORPHOLOGY OF VERTEBRATES. 



FAGB 



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 . 4? 



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 



