CONTENTS. 



CHAPTER I. 



CHARACTERS OF VERTEBRATE ANIMALS. ACRANIA. 



PAGE 



The Vertebrate Body Notochord Skeleton Amphioxus . I 

 CHAPTER II. 



CRANIOTA. 



The Brain and Skull Visceral Arches Limbs Ribs Liver 

 Heart Segmentation ....... 6 



CHAPTER III. 

 CLASS i. PISCES (FISHES). 



General Characters Scales Fins Lateral Line Skeleton 

 Brain Gills and Breathing Swimming Bladder Eggs . XI 



CHAPTER IV. 



ORDER I. LAMPREYS. ORDER 2. SHARKS. 



Lampreys or Marsipobranchs Selachia or Sharks Placoid 



Scales Egg Capsules Sawfishes Skates . . .22 



a 



